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Full Discussion: running egrep in perl script ?
Top Forums Shell Programming and Scripting running egrep in perl script ? Post 302355935 by rethink on Thursday 24th of September 2009 06:01:47 AM
Old 09-24-2009
running egrep in perl script ?
Hi there

if i run this from the BASH command line, i get a good result

Code:
# FS="my-box23/account"
# zfs list -t filesystem -H | cut -f1 |egrep "^ZP[01]pool1/$FS$"
ZP0pool1/my-box23/account

which is great, however if I try to run in a perl script populating an array with the result/s, i get problems

Code:
#!/bin/perl -w
my $FS="my-box23/account";
my @zfs_get = `zfs list -t filesystem -H | cut -f1 | egrep "^ZP[01]pool1/$FS$"`;
print "zfs get equals $zfs_get[0]\n";


# ./test.pl 
Use of uninitialized value in concatenation (.) or string at ./test.pl line 4.
zfs get equals
#


It seems as though it is having problems with my egrep/regex and quotes because if i run a similar statement using standard grep within a perl script, it returns just fine



Code:
#!/bin/perl -w
my $FS="my-box23/account";
my @zfs_get = `zfs list -t filesystem -H | grep $FS | cut -f1 `;
print "zfs get equals $zfs_get[0]\n";


# ./test.pl 
Use of uninitialized value in concatenation (.) or string at ./test.pl line 4.
zfs get equals ZP0pool1/my-box23/account
#

Ive tried running this command within perl's system() function as well to no avail

Is there something i can do to stop perl trying to interpret the egrep/regex quotes and just run the command as it is? i take it `` and system() are finicky about what is put inside them ?

any help would be great
Last edited by rethink; 09-24-2009 at 07:25 AM..
 

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LEARN ABOUT OSF1

uudemon.cleanu

uudemon(4)						     Kernel Interfaces Manual							uudemon(4)

NAME

       uudemon.admin,  uudemon.cleanu,	uudemon.hour,  uudemon.poll  -	Administrative shell scripts for polling remote systems, cleaning up spool
       directories, reporting status to the system administrator, and routine invocations of the uuxqt and uusched daemons

SYNOPSIS

       These shell scripts reside in the following directory:
	  /usr/lib/uucp

DESCRIPTION

       All the scripts can be run from the command line or can be run automatically by the cron daemon. To automatically run the  scripts,  remove
       the comment character (#) from the beginning of the relevant line in the /var/spool/cron/crontabs/uucp file.

       This  script  reports  status  to  the system administrator. It issues the uustat command to find out the status of uucp jobs. It mails the
       results to the uucp login ID. The script may be modified to send mail to any login ID such as the uucp administrative login ID  (uucpa)	or
       root.  This script cleans up the /var/spool/uucp and /var/spool/uucppublic directories by running the uucleanup command. The uucleanup com-
       mand is run with the following parameters: -C7, -D7, X2, -o2, -W1.  This script runs the uusched and uuxqt daemons in the background.  This
       script  polls  the  systems  listed  in	the  /usr/lib/uucp/Poll file.  The uudemon.poll script should be scheduled before the uudemon.hour
       script. This allows uudemon.poll to create any command files before cron runs the uudemon.hour script.

FILES

       Contains the uudemon.admin, uudemon.cleanu, uudemon.hour and uudemon.poll files.  Contains the uucp file.

RELATED INFORMATION

       Commands: cron(8), uucleanup(8), uusched(8), uuxqt(1)

       Files: /usr/lib/uucp delim off

																	uudemon(4)
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