Convert Korn shell echo status to Perl

Posted on 2008-11-02
Last Modified: 2010-05-18
I have the following two UNIX Korn shell commands. The semi-colon is needed instead of the pipe symbol after the grep statement otherwise it doesn't work:

chk_auto_up | grep AUTOSYSDB; echo $?
it returns a 0

chk_auto_up | grep AUTOSYSDB2; echo $?
it returns a 1

Both of these shell statements are returning the correct echo status.

When I run this command as Perl:
system("chk_auto_up | grep AUTOSYSDB | echo $?");
system("chk_auto_up | grep AUTOSYSDB2 | echo $?");

they both return a 0

The "chk_auto_up" command is an AutoSys command which checks databases.

Question by:rkckjk
  • 3
  • 2
LVL 48

Expert Comment

ID: 22860745
system("chk_auto_up | grep AUTOSYSDB2 | echo $?")

should be

system("chk_auto_up | grep AUTOSYSDB2 ; echo $?")
LVL 48

Accepted Solution

Tintin earned 500 total points
ID: 22860752
Sorry, I didn't test beforehand.

You could do
my $result = `chk_auto_up | grep AUTOSYSDB2`;

if ($result) {

  print "Exists\n";


else {

  print "Does not exist\n";


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Author Comment

ID: 22860761
Doesn't work it returns 0.

Author Comment

ID: 22860780
Doesn't work it comes back with Exists
LVL 48

Expert Comment

ID: 22863245
Really?  Can you please show me this behaviour by adding a print before the if test.

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