sbase

suckless unix tools
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flock.1 (699B)


      1 .Dd 2015-10-08
      2 .Dt FLOCK 1
      3 .Os sbase
      4 .Sh NAME
      5 .Nm flock
      6 .Nd tool to manage locks on files
      7 .Sh SYNOPSIS
      8 .Nm
      9 .Op Fl nosux
     10 .Ar file
     11 .Ar cmd Op arg ...
     12 .Sh DESCRIPTION
     13 .Nm
     14 is used to manage advisory locks on open files.  It is commonly used to prevent
     15 long running cron jobs from running in parallel.  If
     16 .Ar file
     17 does not exist, it will be created.
     18 .Sh OPTIONS
     19 .Bl -tag -width Ds
     20 .It Fl n
     21 Set non-blocking mode on the lock.  Fail immediately if the lock
     22 cannot be acquired.
     23 .It Fl o
     24 Close the file descriptor before exec to avoid having the exec'ed
     25 program holding on to the lock.
     26 .It Fl s
     27 Acquire a shared lock.
     28 .It Fl u
     29 Release the lock.
     30 .It Fl x
     31 Acquire an exclusive lock.  This is the default.
     32 .El