Cygwin comes with a number of command-line utilities that are used to manage the UNIX emulation portion of the Cygwin environment. While many of these reflect their UNIX counterparts, each was written specifically for Cygwin. Usage: cygcheck [-s] [-v] [-r] [-h] [program ...] -c check current package setup -h give help about the info -s system information -v verbose output (indented) (for -s or programs) -r registry search (requires -s) -V version info You must at least give either -s or a program name The cygcheck program is a diagnostic utility that examines your system and reports the information that is significant to the proper operation of Cygwin programs. It can give information about a specific program (or program) you are trying to run, general system information, or both. If you list one or more programs on the command line, it will diagnose the runtime environment of that program or programs. If you specify the -s option, it will give general system information. If you specify -s and list one or more programs on the command line, it reports on both. The -c option causes the "program" arguments to be interpreted as package names. cygcheck will report the current version of the package that you specify. With no arguments, cygcheck will report on all packages. The cygcheck program should be used to send information about your system to Cygnus for troubleshooting (if your support representative requests it). When asked to run this command, include all the options plus any commands you are having trouble with, and save the output so that you can mail it to Cygnus, like this: C:\Cygnus> cygcheck -s -v -r -h > tocygnus.txt The -v option causes the output to be more verbose. What this means is that additional information will be reported which is usually not interesting, such as the internal version numbers of DLLs, additional information about recursive DLL usage, and if a file in one directory in the PATH also occurs in other directories on the PATH. The -r option causes cygcheck to search your registry for information that is relevent to Cygnus programs. These registry entries are the ones that have "Cygnus" in the name. If you are paranoid about privacy, you may remove information from this report, but please keep in mind that doing so makes it harder for Cygnus to diagnose your problems. The -h option prints additional helpful messages in the report, at the beginning of each section. It also adds table column headings. While this is useful information, it also adds some to the size of the report, so if you want a compact report or if you know what everything is already, just leave this out. Usage: cygpath [-p|--path] (-w|--windows) ([-s|--short-name]|[-l|--long-name]) filename Usage: cygpath [-p|--path] (-u|--unix) filename Usage: cygpath (-H|--homeroot)|(-S|--sysdir)|(-W|--windir) [-s|--short-name] Usage: cygpath [-A|--allusers] (-D|--desktop)|(-P|--smprograms) [-s|--short-name] -a|--absolute output absolute path -c|--close handle close handle (for use in captured process) -f|--file file read file for input path information -i|--ignore ignore missing argument -l|--long-name print Windows long form of filename -p|--path filename argument is a path -s|--short-name print Windows short form of filename -u|--unix print Unix form of filename -t|--type print Windows form of filename with specified dos drive letter with backslashes (c:\winnt) mixed drive letter with regular slashes (c:/winnt) -v|--version output version information and exit -w|--windows print Windows form of filename -A|--allusers use `All Users' instead of current user for -D, -P -H|--homeroot output `Profiles' directory (home root) and exit -D|--desktop output `Desktop' directory and exit -P|--smprograms output Start Menu `Programs' directory and exit -S|--sysdir output system directory and exit -W|--windir output `Windows' directory and exit The cygpath program is a utility that converts Windows native filenames to Cygwin POSIX-style pathnames and back. It can be used when a Cygwin program needs to pass a file name to a native Windows program, or expects to get a file name from a native Windows program. You may use the long or short option names interchangeably, even though only the short ones are described here. The -u and -w options indicate whether you want a conversion from Windows to UNIX (POSIX) format (-u) or a conversion from UNIX (POSIX) to Windows format (-w). You must give exactly one of these. To give neither or both is an error. Use the -l or -s option in combination with the -w option to convert to Windows long or short form. Caveat: The -l option does not work if the check_case parameter of CYGWIN is set to strict, since Cygwin is not able to match any Windows short path in this mode. The -p option means that you want to convert a path-style string rather than a single filename. For example, the PATH environment variable is semicolon-delimited in Windows, but colon-delimited in UNIX. By giving -p you are instructing cygpath to convert between these formats. The -i option supresses the print out of the usage message if no filename argument was given. It can be used in make file rules converting variables to a proper format that may be omitted. #!/bin/sh for i in `echo *.exe | sed 's/\.exe/.cc/'` do notepad "`cygpath -w $i`" done The capital options -D, -H, -P, -S, and -W output directories used by Windows that are not the same on all systems, for example -S might output C:\WINNT\SYSTEM32 or C:\WINDOWS\SYSTEM. The -A option forces use of the "All Users" directories instead of the current user for the -D and -P options. The -H shows the Windows' profiles directory that can be used as root of home. On Win9x systems with only a single user, -A has no effect; -D and -AD would have the same output. The -ws options can be combined with the capital options. Usage: kill [-f] [-sigN] [-s sigN] pid1 [pid2 ...] Usage: kill -l [signal] Usage: Kill -h The kill program allows you to send arbitrary signals to other Cygwin programs. The usual purpose is to end a running program from some other window when ^C won't work, but you can also send program-specified signals such as SIGUSR1 to trigger actions within the program, like enabling debugging or re-opening log files. Each program defines the signals they understand. Note that, unless you specific the -f option, the "pid" values are the Cygwin pids, not the Windows pids. To get a list of running programs and their Cygwin pids, use the Cygwin ps program. ps -W will display all windows pids. The kill -l option prints the name of the given signal, or a list of all signal names if no signal is given. kill -h just displays the kill usage message. To send a specific signal, use the -signN option, either with a signal number or a signal name (minus the "SIG" part), like these examples: $ kill 123 $ kill -1 123 $ kill -HUP 123 $ kill -f 123 Here is a list of available signals, their numbers, and some commentary on them, from the file <sys/signal.h>, which should be considered the official source of this information. SIGHUP 1 hangup SIGINT 2 interrupt SIGQUIT 3 quit SIGILL 4 illegal instruction (not reset when caught) SIGTRAP 5 trace trap (not reset when caught) SIGABRT 6 used by abort SIGEMT 7 EMT instruction SIGFPE 8 floating point exception SIGKILL 9 kill (cannot be caught or ignored) SIGBUS 10 bus error SIGSEGV 11 segmentation violation SIGSYS 12 bad argument to system call SIGPIPE 13 write on a pipe with no one to read it SIGALRM 14 alarm clock SIGTERM 15 software termination signal from kill SIGURG 16 urgent condition on IO channel SIGSTOP 17 sendable stop signal not from tty SIGTSTP 18 stop signal from tty SIGCONT 19 continue a stopped process SIGCHLD 20 to parent on child stop or exit SIGCLD 20 System V name for SIGCHLD SIGTTIN 21 to readers pgrp upon background tty read SIGTTOU 22 like TTIN for output if (tp->t_local&LTOSTOP) SIGIO 23 input/output possible signal SIGPOLL 23 System V name for SIGIO SIGXCPU 24 exceeded CPU time limit SIGXFSZ 25 exceeded file size limit SIGVTALRM 26 virtual time alarm SIGPROF 27 profiling time alarm SIGWINCH 28 window changed SIGLOST 29 resource lost (eg, record-lock lost) SIGUSR1 30 user defined signal 1 SIGUSR2 31 user defined signal 2 usage: mkgroup [options] [domain] This program prints a /etc/group file to stdout Options: -l,--local print local group information -d,--domain print global group information from the domain specified (or from the current domain if there is no domain specified) -o,--id-offset offset change the default offset (10000) added to uids in domain accounts. -s,--no-sids don't print SIDs in pwd field (this affects ntsec) -u,--users print user list in gr_mem field -?,--help print this message One of `-l' or `-d' must be given on NT/W2K. The mkgroup program can be used to help configure your Windows system to be more UNIX-like by creating an initial /etc/group substitute (some commands need this file) from your system information. It only works on NT. To initially set up your machine, you'd do something like this: $ mkdir /etc $ mkgroup -l > /etc/group Note that this information is static. If you change the group information in your system, you'll need to regenerate the group file for it to have the new information. The -d and -l options allow you to specify where the information comes from, either the local machine or the default (or given) domain. Usage: mkpasswd [options] [domain] Usage: mkpasswd [OPTION]... [domain] This program prints a /etc/passwd file to stdout Options: -l,--local print local user accounts -d,--domain print domain accounts (from current domain if no domain specified) -o,--id-offset offset change the default offset (10000) added to uids in domain accounts. -g,--local-groups print local group information too if no domain specified -m,--no-mount don't use mount points for home dir -s,--no-sids don't print SIDs in GCOS field (this affects ntsec) -p,--path-to-home path if user account has no home dir, use path instead of /home/ -u,--username username only return information for the specified user -?,--help displays this message One of `-l', `-d' or `-g' must be given on NT/W2K. The mkpasswd program can be used to help configure your Windows system to be more UNIX-like by creating an initial /etc/passwd substitute (some commands need this file) from your system information. It only works on NT. To initially set up your machine, you'd do something like this: $ mkdir /etc $ mkpasswd -l > /etc/passwd Note that this information is static. If you change the user information in your system, you'll need to regenerate the passwd file for it to have the new information. The -d and -l options allow you to specify where the information comes from, either the local machine or the default (or given) domain. Usage passwd [name] passwd [-x max] [-n min] [-i inact] [-L len] passwd {-l|-u|-S} name -x max set max age of passwords -n min set min age of passwords -i inact disables account after inact days of expiry -L len set min password length -l lock an account -u unlock an account -S show account information passwd changes passwords for user accounts. A normal user may only change the password for their own account, the administrators may change the password for any account. passwd also changes account information, such as password expiry dates and intervals. Password changes: The user is first prompted for their old password, if one is present. This password is then encrypted and compared against the stored password. The user has only one chance to enter the correct password. The administrators are permitted to bypass this step so that forgotten passwords may be changed. The user is then prompted for a replacement password. passwd will prompt again and compare the second entry against the first. Both entries are require to match in order for the password to be changed. After the password has been entered, password aging information is checked to see if the user is permitted to change their password at this time. If not, passwd refuses to change the password and exits. Password expiry and length: The password aging information may be changed by the administrators with the -x, -n and -i options. The -x option is used to set the maximum number of days a password remains valid. After max days, the password is required to be changed. The -n option is used to set the minimum number of days before a password may be changed. The user will not be permitted to change the password until min days have elapsed. The -i option is used to disable an account after the password has been expired for a number of days. After a user account has had an expired password for inact days, the user may no longer sign on to the account. Allowed values for the above options are 0 to 999. The -L option sets the minimum length of allowed passwords for users, which doesn't belong to the administrators group, to len characters. Allowed values for the minimum password length are 0 to 14. In any of the above cases, a value of 0 means `no restrictions'. Account maintenance: User accounts may be locked and unlocked with the -l and -u flags. The -l option disables an account. The -u option re-enables an account. The account status may be given with the -S option. The status information is self explanatory. Limitations: Users may not be able to change their password on some systems. Usage mount mount [options] <win32path> <posixpath> -b, --binary text files are equivalent to binary files (newline = \n) -c, --change-cygdrive-prefix change the cygdrive path prefix to <posixpath> -f, --force force mount, don't warn about missing mount point directories -i, --import-old-mounts copy old registry mount table mounts into the current mount areas -p, --show-cygdrive-prefix show user and/or system cygdrive path prefix -s, --system (default) add mount point to system-wide registry location -t, --text (default) text files get \r\n line endings -u, --user add mount point to user registry location -x, --executable treat all files under mount point as executables -X, --cygwin-executable treat all files under mount point as cygwin executables. Use to speed up file access. -E, --no-executable don't open files to see if they contain executable magic. Use to speed up file access. -m, --mount-commands write mount commands to replace user and system mount points and cygdrive prefixes When invoked without any arguments, mount displays the current mount table. The mount program is used to map your drives and shares onto Cygwin's simulated POSIX directory tree, much like as is done by mount commands on typical UNIX systems. Please see for more information on the concepts behind the Cygwin POSIX file system and strategies for using mounts. If you just type mount with no parameters, it will display the current mount table for you. c:\cygnus\> mount Device Directory Type Flags D: /d user textmode C: / system textmode In this example, the C drive is the POSIX root and D drive is mapped to /d. Note that in this case, the root mount is a system-wide mount point that is visible to all users running Cygwin programs, whereas the /d mount is only visible to the current user. The mount utility is also the mechanism for adding new mounts to the mount table. The following example demonstrates how to mount the directory C:\cygnus\cygwin-b20\H-i586-cygwin32\bin to /bin and the network directory \\pollux\home\joe\data to /data. /bin is assumed to already exist. c:\cygnus\> ls /bin /data ls: /data: No such file or directory c:\cygnus\> mount C:\cygnus\cygwin-b20\H-i586-cygwin32\bin /bin c:\cygnus\> mount \\pollux\home\joe\data /data Warning: /data does not exist! c:\cygnus\> mount Device Directory Type Flags \\pollux\home\joe\data /data user textmode C:\cygnus\cygwin-b20\H-i586-cygwin32\bin /bin user textmode D: /d user textmode \\.\tape1: /dev/st1 user textmode \\.\tape0: /dev/st0 user textmode \\.\b: /dev/fd1 user textmode \\.\a: /dev/fd0 user textmode C: / system textmode c:\cygnus\> ls /bin/sh /bin/sh Note that mount was invoked from the Windows command shell in the previous example. In many Unix shells, including bash, it is legal and convenient to use the forward "/" in Win32 pathnames since the "\" is the shell's escape character. The "-s" flag to mount is used to add a mount in the system-wide mount table used by all Cygwin users on the system, instead of the user-specific one. System-wide mounts are displayed by mount as being of the "system" type, as is the case for the / partition in the last example. Under Windows NT, only those users with Administrator priviledges are permitted to modify the system-wide mount table. Note that a given POSIX path may only exist once in the user table and once in the global, system-wide table. Attempts to replace the mount will fail with a busy error. The "-f" (force) flag causes the old mount to be silently replaced with the new one. It will also silence warnings about the non-existence of directories at the Win32 path location. The "-b" flag is used to instruct Cygwin to treat binary and text files in the same manner by default. Binary mode mounts are marked as "binmode" in the Flags column of mount output. By default, mounts are in text mode ("textmode" in the Flags column). The "-x" flag is used to instruct Cygwin that the mounted file is "executable". If the "-x" flag is used with a directory then all files in the directory are executable. Files ending in certain extensions (.exe, .com, .bat, .cmd) are assumed to be executable by default. Files whose first two characters begin with '#!' are also considered to be executable. This option allows other files to be marked as executable and avoids the overhead of opening each file to check for a '#!'. Whenever Cygwin cannot use any of the existing mounts to convert from a particular Win32 path to a POSIX one, Cygwin will, instead, convert to a POSIX path using a default mount point: /cygdrive. For example, if Cygwin accesses Z:\foo and the Z drive is not currently in the mount table, then Z:\ will be accessible as /cygdrive/Z. The default prefix of /cygdrive may be changed via the command. The mount utility can be used to change this default automount prefix through the use of the "--change-cygdrive-prefix" flag. In the following example, we will set the automount prefix to /: c:\cygnus\> mount --change-cygdrive-prefix / Note that you if you set a new prefix in this manner, you can specify the "-s" flag to make this the system-wide default prefix. By default, the cygdrive-prefix applies only to the current user. In the same way, you can specify the "-b" flag such that all new automounted filesystems default to binary mode file accesses. Limitations: there is a hard-coded limit of 30 mount points. Also, although you can mount to pathnames that do not start with "/", there is no way to make use of such mount points. Normally the POSIX mount point in Cygwin is an existing empty directory, as in standard UNIX. If this is the case, or if there is a place-holder for the mount point (such as a file, a symbolic link pointing anywhere, or a non-empty directory), you will get the expected behavior. Files present in a mount point directory before the mount become invisible to Cygwin programs. It is sometimes desirable to mount to a non-existent directory, for example to avoid cluttering the root directory with names such as a, b, c pointing to disks. Although mount will give you a warning, most everything will work properly when you refer to the mount point explicitly. Some strange effects can occur however. For example if your current working directory is /dir, say, and /dir/mtpt is a mount point, then mtpt will not show up in an ls or echo * command and find . will not find mtpt. Usage ps [-aefl] [-u uid] -a, -e show processes of all users -f show process uids, ppids -l show process uids, ppids, pgids, winpids -s short process listing -u uid show processes owned by uid -W show all windows processes, not just cygwin processes The ps program gives the status of all the Cygwin processes running on the system (ps = "process status"). Due to the limitations of simulating a POSIX environment under Windows, there is little information to give. The PID column is the process ID you need to give to the kill command. The WINPID column is the process ID that's displayed by NT's Task Manager program. Usage umount [options] <posixpath> -A, --remove-all-mounts remove all mounts -c, --remove-cygdrive-prefix remove cygdrive prefix -s, --system remove system mount (default) -S, --remove-system-mounts remove all system mounts -u, --user remove user mount -U, --remove-user-mounts remove all user mounts The umount program removes mounts from the mount table. If you specify a POSIX path that corresponds to a current mount point, umount will remove it from the user-specific registry area. The -s flag may be used to specify removing the mount from the system-wide registry area instead (Administrator priviledges are required). The umount utility may also be used to remove all mounts of a particular type. With the extended options it is possible to remove all mounts, all automatically-mounted mounts, all mounts in the current user's registry area, or all mounts in the system-wide registry area (with Administrator privileges). See ) for more information on the mount table. Usage: strace [OPTIONS] Usage: strace [OPTIONS] -p -b, --buffer-size=SIZE set size of output file buffer -d, --no-delta don't display the delta-t microsecond timestamp -f, --trace-children trace child processes (toggle - default true) -h, --help output usage information and exit -m, --mask=MASK set message filter mask -n, --crack-error-numbers output descriptive text instead of error numbers for Windows errors -o, --output=FILENAME set output file to FILENAME -p, --pid=n attach to executing program with cygwin pid n -S, --flush-period=PERIOD flush buffered strace output every PERIOD secs -t, --timestamp use an absolute hh:mm:ss timestamp insted of the default microsecond timestamp. Implies -d -T, --toggle toggle tracing in a process already being traced. Requires -p -v, --version output version information and exit -w, --new-window spawn program under test in a new window MASK can be any combination of the following mnemonics and/or hex values (0x is optional). Combine masks with '+' or ',' like so: --mask=wm+system,malloc+0x00800 Mnemonic Hex Corresponding Def Description ========================================================================= all 0x00001 (_STRACE_ALL) All strace messages. flush 0x00002 (_STRACE_FLUSH) Flush output buffer after each message. inherit 0x00004 (_STRACE_INHERIT) Children inherit mask from parent. uhoh 0x00008 (_STRACE_UHOH) Unusual or weird phenomenon. syscall 0x00010 (_STRACE_SYSCALL) System calls. startup 0x00020 (_STRACE_STARTUP) argc/envp printout at startup. debug 0x00040 (_STRACE_DEBUG) Info to help debugging. paranoid 0x00080 (_STRACE_PARANOID) Paranoid info. termios 0x00100 (_STRACE_TERMIOS) Info for debugging termios stuff. select 0x00200 (_STRACE_SELECT) Info on ugly select internals. wm 0x00400 (_STRACE_WM) Trace Windows msgs (enable _strace_wm). sigp 0x00800 (_STRACE_SIGP) Trace signal and process handling. minimal 0x01000 (_STRACE_MINIMAL) Very minimal strace output. exitdump 0x04000 (_STRACE_EXITDUMP) Dump strace cache on exit. system 0x08000 (_STRACE_SYSTEM) Cache strace messages. nomutex 0x10000 (_STRACE_NOMUTEX) Don't use mutex for synchronization. malloc 0x20000 (_STRACE_MALLOC) Trace malloc calls. thread 0x40000 (_STRACE_THREAD) Thread-locking calls. The strace program executes a program, and optionally the children of the program, reporting any Cygwin DLL output from the program(s) to file. This program is mainly useful for debugging the Cygwin DLL itself. Regtool Copyright (c) 2000 Red Hat Inc regtool -h - print this message regtool [-v|-p|-k|-l] list [key] - list subkeys and values -p=postfix, like ls -p, appends / postfix to key names -k=keys, lists only keys -l=values, lists only values regtool [-v] add [key\subkey] - add new subkey regtool [-v] remove [key] - remove key regtool [-v|-q] check [key] - exit 0 if key exists, 1 if not regtool [-i|-s|-e|-m] set [key\value] [data ...] - set value -i=integer -s=string -e=expand-string -m=multi-string regtool [-v] unset [key\value] - removes value from key regtool [-q] get [key\value] - prints value to stdout -q=quiet, no error msg, just return nonzero exit if key/value missing key is in the format [host]\prefix\KEY\KEY\VALUE, where host is optional remote host in either \\hostname or hostname: format and prefix is any of: root HKCR HKEY_CLASSES_ROOT (local only) config HKCC HKEY_CURRENT_CONFIG (local only) user HKCU HKEY_CURRENT_USER (local only) machine HKLM HKEY_LOCAL_MACHINE users HKU HKEY_USERS You can use forward slash ('/') as a separator instead of backslash, in that case backslash is treated as escape character. example: \user\software\Microsoft\Clock\iFormat The regtool program allows shell scripts to access and modify the Windows registry. Note that modifying the Windows registry is dangerous, and carelessness here can result in an unusable system. Be careful. The -v option means "verbose". For most commands, this causes additional or lengthier messages to be printed. Conversely, the -q option supresses error messages, so you can use the exit status of the program to detect if a key exists or not (for example). The list command lists the subkeys and values belonging to the given key. The add command adds a new key. The remove command removes a key. Note that you may need to remove everything in the key before you may remove it, but don't rely on this stopping you from accidentally removing too much. The check command checks to see if a key exists (the exit code of the program is zero if it does, nonzero if it does not). The set command sets a value within a key. -i means the value is an integer (DWORD). -s means the value is a string. -e means it's an expanding string (it contains embedded environment variables). -m means it's a multi-string (list). If you don't specify one of these, it tries to guess the type based on the value you give. If it looks like a number, it's a number. If it starts with a percent, it's an expanding string. If you give multiple values, it's a multi-string. Else, it's a regular string. The unset command removes a value from a key. The get command gets the value of a value of a key, and prints it (and nothing else) to stdout. Note: if the value doesn't exist, an error message is printed and the program returns a non-zero exit code. If you give -q, it doesn't print the message but does return the non-zero exit code. Usage: dumper [OPTION] FILENAME WIN32PID Dump core from WIN32PID to FILENAME.core -d, --verbose be verbose while dumping -h, --help output help information and exit -q, --quiet be quiet while dumping (default) -v, --version output version information and exit The dumper utility can be used to create core dump of running windows process. This core dump can be later loaded to gdb an analyzed. One common way to use dumper is to plug it into cygwin's Just-In-Time debugging facility by adding error_start=x:\path\to\dumper.exe to CYGWIN environment variable. Please note that x:\path\to\dumper.exe is win32-style and not cygwin path. If error_start is set this way, then dumper will be started whenever some program encounters fatal error. dumper can be also be started from command line to create core dump of any running process. Unfortunately, because of windows API limitation, when core dump is created and dumper exits, the target process is terminated too. To save the space in core dump, dumper doesn't write those portions of target process' memory space that are loaded from executable and dll files and are unchangeable, such as program code and debug info. Instead, dumper saves paths to files which contain that data. When core dump is loaded into gdb, it uses these paths to load appropriate files. That means that if you create core dump on one machine and try to debug it on other, you'll need to place identical copies of executable and dlls in the same directories as on machine where core dump has been created.