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Answer: How to run a shell script from a Perl program?

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Q&A > programs and processes > How to run a shell script from a Perl program? contributed by ruzam

A slightly longer version using the exec method with forked pipes (and an optional timeout value).

# two parameters: # cmd - a command or reference to an array of command + arguments # timeout - number of seconds to wait (0 = forever) # returns: # cmd exit status (-1 if timed out) # cmd results (STDERR and STDOUT merged into an array ref) sub ExecCmd { my $cmd = shift || return(0, []); my $timeout = shift || 0; # opening a pipe creates a forked process my $pid = open(my $pipe, '-|'); return(-1, "Can't fork: $!") unless defined $pid; if ($pid) { # this code is running in the parent process my @result = (); if ($timeout) { my $failed = 1; eval { # set a signal to die if the timeout is reached local $SIG{ALRM} = sub { die "alarm\n" }; alarm $timeout; @result = <$pipe>; alarm 0; $failed = 0; }; return(-1, ['command timeout', @result]) if $failed; } else { @result = <$pipe>; } close($pipe); # return exit status, command output return ($? >> 8), \@result; } # this code is running in the forked child process { # skip warnings in this block no warnings; # redirect STDERR to STDOUT open(STDERR, '>&STDOUT'); # exec transfers control of the process # to the command ref($cmd) eq 'ARRAY' ? exec(@$cmd) : exec($cmd); } # this code will not execute unless exec fails! print "Can't exec @$cmd: $!"; exit 1; }

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