Mac OS X equivalent of Linux flock(1) command

Question

Is there a flock command on Mac OS X that manages file lock?

http://linux.die.net/man/1/flock

Answer 1

There is a cross-platform flock command here:

https://github.com/discoteq/flock

I have tested it and it works well on OSX as a drop-in replacement for the util-linux flock.

Answer 2

Perl one-liner:

perl -MFcntl=:flock -e '$|=1; $f=shift; print("starting\n"); open(FH,$f) || die($!); flock(FH,LOCK_EX); print("got lock\n"); system(join(" ",@ARGV)); print("unlocking\n"); flock(FH,LOCK_UN); ' /tmp/longrunning.sh /tmp/longrunning.sh

As a script:

#!/usr/bin/perl  # emulate linux flock command line utility # use warnings; use strict; use Fcntl qw(:flock); # line buffer $|=1;  my $file = shift; my $cmd = join(" ",@ARGV);  if(!$file || !$cmd) {     die("usage: $0 <file> <command> [ <command args>... ]\n"); }  print("atempting to lock file: $file\n");  open(FH,$file) || die($!);  flock(FH,LOCK_EX) || die($!);  print("got lock\n");  print("running command: $cmd\n");  system($cmd); print("unlocking file: $file\n");  flock(FH,LOCK_UN);