22921a859f
Fix "new sentence, new line" warnings throughout so that formatters can produce correct spacing between sentences. join.1 Remove unnecessary Ns macros. These are not necessary for delimeters, which get special treatment. xinstall.1 Fix date in manual. The contents were last modified on 2016-12-03, so use that instead of the invalid date. grep.1 Fix escape sequence for `\<` and `\>`. ed.1 Remove spurious `\\n` escape for the null-command.
36 lines
695 B
Groff
36 lines
695 B
Groff
.Dd 2015-10-08
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.Dt FLOCK 1
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.Os sbase
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.Sh NAME
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.Nm flock
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.Nd tool to manage locks on files
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.Sh SYNOPSIS
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.Nm
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.Op Fl nosux
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.Ar file
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.Ar cmd Op arg ...
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.Sh DESCRIPTION
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.Nm
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is used to manage advisory locks on open files.
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It is commonly used to prevent long running cron jobs from running in
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parallel.
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If
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.Ar file
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does not exist, it will be created.
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl n
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Set non-blocking mode on the lock.
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Fail immediately if the lock cannot be acquired.
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.It Fl o
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Close the file descriptor before exec to avoid having the exec'ed
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program holding on to the lock.
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.It Fl s
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Acquire a shared lock.
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.It Fl u
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Release the lock.
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.It Fl x
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Acquire an exclusive lock.
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This is the default.
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.El
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