Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

Command Grep

by fundflow (Chaplain)
on Aug 23, 2001 at 20:13 UTC ( #107380=snippet: print w/ replies, xml ) Need Help??

Description: This short snippet searches the current path for commands that contain the argument (that can be a regular expression)

This is a two-minute effort that helped me find out that redhat ships with 'gcolorsel' which replaces the old 'xcolors'.

(Now cleaned and documented for your viewing pleasure)

#!/usr/bin/perl

# Lists commands on the path that contain the given regular expression
+.
#
# USAGE:
# comgrep.pl <regular expression>
my $pat=shift || "";
my %printed;
foreach my $p (split ":",$ENV{PATH}) {
   foreach (glob "$p/*") {
      next unless -X && -f;
      s|//|/|g;
      my ($path, $name)= m|(.*)\/([^/]*)|;
      print "$_\n" if $name=~m/$pat/o and !$printed{$_};
      $printed{$_}=1;
    }
}
Comment on Command Grep
Download Code
Re: Command Grep
by bwana147 (Pilgrim) on Aug 29, 2001 at 15:01 UTC

    Nice! Two comments though:

    • Since $pat doesn't ever change, you can use the /o modifier to prevent the recompilation of the regex at each loop: $name =~ /$pat/o
    • Since you use pipes as pattern delimiter, the slash looses its special meaning and no longer needs be escaped: s|//|/|g;. That's easier to read, IMHO (btw, what's the use of this?)

    --bwana147

      Updated, thanks.
Re: Command Grep
by trizen (Friar) on Dec 08, 2011 at 00:55 UTC
    Same thing, but in fewer characters...
    my $r = shift() // ''; -X -f && substr($_,1+rindex$_,'/')=~/$r/o && print"$_\n"for(map{glob"$_/*"}split/:/,$ENV{PATH});

Back to Snippets Section

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: snippet [id://107380]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chilling in the Monastery: (6)
As of 2015-05-25 18:39 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    In my home, the TV remote control is ...









    Results (487 votes), past polls