A couple things that might be worth trying... 
# crontab -l
* * * * * perl /root/nfs_share/SCRIPTS/cron_ncp.pl >>/tmp/cron_ncp.tmp
+.txt 2>&1

[download]
That is, redirect output somewhere else, just to be sure there aren't permission issues, and include stderr together with stdout. 
#!/usr/bin/perl

use strict;
use warnings;

my $tmp = `ps -ef`;
if ( $tmp !~ /ncp_run.tcl/ ) {
    my $cmd = 'expect -f /root/nfs_share/SCRIPTS/ncp_run.tcl';
    print "starting now: $cmd\n";
    exec $cmd;
}
printf "ncp_run.tcl is already running as of %s: %s\n", scalar(localti
+me),  $tmp );

[download]
That is, output a little more information about what's happening, and use exec instead of system (and do a bit of tidying/tightening up).

In reply to Re: perl script in nohup running from crontab by graff
in thread perl script in nohup running from crontab by tanuj

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