unimatrix
Aug 17 2005, 08:07 AM
| | I am writing a script to add submit/add projects to a queue. I don't need a returned result other than it worked or failed. The script will execute a commandline like thisL
'program -b $filename -s $start -e $end -a'
all I need is for that command to be send and if it suceeds return a simple
"This worked"
or
"This failed: here is why ___________".
I am just trying to remember the difference between exec and system() for this task. I've read through the documentation and am still a little confused. It's the first time I've really used PERL in at least four years. |
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yordan
Aug 17 2005, 09:50 AM
Read your doc carefully. On unix or Linux shell scripts, "exec" means "execute what I tell you and exit immediately after that". This means that, in Unix, all the lines after the exec instruction are ignored... 
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Digital Technic
Nov 3 2005, 05:27 PM
Use backticks to capture output. CODE
$output = `program optional_arguments_jere`;
Please note that those are backticks(on QWERTY it's right below the Escape key). Regards, Digital Technic.
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crtburn
Nov 17 2005, 11:07 AM
Use the system() function to execute a program without saving the program's output. The return value of the system() function is the program's exit status or you could check the special $? variable which will have it as well. The exit value 0 means the program exited successfully and anything else probably means there was a problem. If there was an error then it will be stored in $!. CODE system("myprogram --foo $bar") == 0 or die "myprogram failed ($?): $!";
print "myprogram ran successfully.\n";
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