watchexec/doc/watchexec.1

.\" generated with Ronn/v0.7.3
.\" http://github.com/rtomayko/ronn/tree/0.7.3
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.TH "WATCHEXEC" "1" "August 2018" "" ""
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.SH "NAME"
\fBwatchexec\fR \- execute commands when watched files change
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.SH "SYNOPSIS"
watchexec [\fB\-\-exts\fR | \fB\-e\fR \fIextensions\fR]\.\.\. [\fB\-\-filter\fR | \fB\-f\fR \fIpattern\fR]\.\.\. [\fB\-\-ignore\fR | \fB\-i\fR \fIpattern\fR]\.\.\. [\fB\-\-watch\fR | \fB\-w\fR \fIpath\fR]\.\.\. [\fB\-\-restart\fR | \fB\-r\fR] [\fB\-\-clear\fR | \fB\-c\fR] [\fB\-\-postpone\fR | \fB\-p\fR] [\fB\-\-force\-poll\fR \fIinterval\fR] [\fB\-\-debug\fR | \fB\-d\fR] [\fB\-\-no\-vcs\-ignore\fR] [\fB\-\-no\-default\-ignore\fR] \fIcommand\fR [\fIargument\fR\.\.\.]
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.SH "DESCRIPTION"
Recursively monitors the current directory for changes, executing the command when a filesystem change is detected\. By default, watchexec uses efficient kernel\-level mechanisms to watch for changes\.
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.P
At startup, the specified \fIcommand\fR (passing any supplied \fIargument\fRs) is run once, and watchexec begins monitoring for changes\.
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.SH "OPTIONS"
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.TP
\fIcommand\fR
Command to run when watched files are modified, and at startup, unless \fB\-\-postpone\fR is specified\. All \fIargument\fRs are passed to \fIcommand\fR\.
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.TP
\fB\-e\fR, \fB\-\-exts\fR \fIextensions\fR
Comma\-separated list of file extensions to filter by\. Leading dots are allowed (\.rs) are allowed\. (This is a shorthand for \fB\-f\fR)\.
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.TP
\fB\-f\fR, \fB\-\-filter\fR \fIpattern\fR
Ignores modifications from paths that do not match \fIpattern\fR\. This option can be specified multiple times, where a match on any given pattern causes the path to trigger \fIcommand\fR\.
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.TP
\fB\-s\fR, \fB\-\-signal\fR
Sends the specified signal (e\.g\. \fBSIGKILL\fR) to the child process\. Defaults to \fBSIGTERM\fR\.
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.TP
\fB\-n\fR, \fB\-\-no\-shell\fR
Execute command directly, do not wrap it in \fBsh \-c\fR resp\. \fBcmd\.exe /C\fR\. This is especially useful in combination with \fB\-\-signal\fR, as the signal is then send directly to the specified command\. While \fB\-\-no\-shell\fR is a little more performant than the default, it prevents using shell\-features like pipes and redirects\.
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.TP
\fB\-i\fR, \fB\-\-ignore\fR \fIpattern\fR
Ignores modifications from paths that match \fIpattern\fR\. This option can be specified multiple times, and a match on any pattern causes the path to be ignored\.
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.TP
\fB\-w\fR, \fB\-\-watch\fR \fIpath\fR
Monitor a specific path for changes\. By default, the current working directory is watched\. This may be specified multiple times, where a change in any watched directory (and subdirectories) causes \fIcommand\fR to be executed\.
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.TP
\fB\-r\fR, \fB\-\-restart\fR
Terminates the child process group if it is still running when subsequent file modifications are detected\. By default, sends \fBSIGTERM\fR; use \fB\-\-kill\fR to send \fBSIGKILL\fR\.
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.TP
\fB\-c\fR, \fB\-\-clear\fR
Clears the screen before executing \fIcommand\fR\.
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.TP
\fB\-p\fR, \fB\-\-postpone\fR
Postpone execution of \fIcommand\fR until the first file modification is detected\.
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.TP
\fB\-d\fR, \fB\-\-debug\fR
Prints diagnostic messages to STDERR
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.TP
\fB\-\-force\-poll\fR \fIinterval\fR
Poll for changes every \fIinterval\fR ms instead of using system\-specific notification mechanisms (such as inotify)\. This is useful when you are monitoring NFS shares\.
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.TP
\fB\-\-no\-vcs\-ignore\fR
Skip loading of version control system (VCS) ignore files\. By default, watchexec loads \.gitignore files in the current directory (or parent directories) and uses them to populate the ignore list\.
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.TP
\fB\-\-no\-default\-ignore\fR
Skip default ignore statements\. By default, watchexec ignores common temporary files for you, for example \fB*\.swp\fR, \fB*\.pyc\fR, and \fB\.DS_Store\fR\.
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.SH "ENVIRONMENT"
Processes started by watchexec have environment variables set describing the modification(s) observed\. Which variable is set depends on how many modifications were observed and/or what type they were\.
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.P
If a single file changed (depending on the event type):
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.IP "\(bu" 4
\fB$WATCHEXEC_CREATED_PATH\fR, the path of the file that was created
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.IP "\(bu" 4
\fB$WATCHEXEC_REMOVED_PATH\fR, the path of the file that was removed
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.IP "\(bu" 4
\fB$WATCHEXEC_RENAMED_PATH\fR, the path of the file that was renamed
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.IP "\(bu" 4
\fB$WATCHEXEC_WRITTEN_PATH\fR, the path of the file that was modified
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.IP "\(bu" 4
\fB$WATCHEXEC_META_CHANGED_PATH\fR, the path of the file whose metadata changed
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.IP "" 0
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.P
If multiple files changed:
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.IP "\(bu" 4
\fB$WATCHEXEC_COMMON_PATH\fR, the longest common path of all of the files that triggered a change
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.IP "" 0
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.SH "EXAMPLES"
Rebuild a project when source files change:
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.IP "" 4
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.nf

$ watchexec make
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.fi
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.IP "" 0
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.P
Watch all HTML, CSS, and JavaScript files for changes:
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.IP "" 4
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.nf

$ watchexec \-e html,css,js make
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.fi
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.IP "" 0
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.P
Run tests when source files change, clearing the screen each time:
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.IP "" 4
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.nf

$ watchexec \-c make test
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.fi
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.IP "" 0
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.P
Launch and restart a node\.js server:
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.IP "" 4
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.nf

$ watchexec \-r node app\.js
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.fi
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.IP "" 0
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.P
Watch lib and src directories for changes, rebuilding each time:
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.IP "" 4
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.nf

$ watchexec \-w lib \-w src make
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.fi
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.IP "" 0