in reply to Permissions for a separately installed perl

What do you get for 

$ ls -l /opt/perl/bin/perl

$ which -a perl

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The shell's search behavior (mimicked by which) is to skip programs if their binary isn't executable for the user in question, even if it comes earlier in $PATH.

P.S.: it's usually not a good idea to make directories like /opt/perl world-writable...

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Re^2: Permissions for a separately installed perl
by wfsp (Abbot) on Feb 28, 2010 at 12:31 UTC 
    $ ls -l /opt/perl/bin/perl
-rwxr-xr-x 2 john john 1169915 2010-02-28 10:30 /opt/perl/bin/perl
$ which -a perl
/usr/local/bin/perl
/usr/bin/perl

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[reply]
[d/l]

      Ok, in that shell, what does 

      perl -e 'print "$]\n";'

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      yield?

      The shell hashes paths to commands, and if you add a command to a path previous in $PATH to the already hashed one, your may not see the changes:

      qwurx [shmem] ~> touch blorflydick
qwurx [shmem] ~> rm blorflydick
qwurx [shmem] ~> mkdir bin
qwurx [shmem] ~> PATH=$HOME/bin:$PATH
qwurx [shmem] ~> which rm
/bin/rm
qwurx [shmem] ~> echo '#!/bin/sh' > bin/rm
qwurx [shmem] ~> echo 'echo no rm damnit' >> bin/rm
qwurx [shmem] ~> chmod a+x bin/rm
qwurx [shmem] ~> which rm
~/bin/rm
qwurx [shmem] ~> rm blorflydick
rm: cannot remove `bloflydick': No such file or directory
qwurx [shmem] ~>

      [download]

      A new shell will see the changes, however: 

      qwurx [shmem] ~> echo $SHLVL
4
qwurx [shmem] ~> bash
qwurx [shmem] ~> echo $SHLVL
5
qwurx [shmem] ~> rm blorflydick
no rm damnit
qwurx [shmem] ~>

      [download]
[reply]
[d/l]
[select]
        A new shell will see the changes

        or 

        $ hash -r

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        to make bash forget its cached bindings.

[reply]
[d/l]
[select]

      Hm... another try: 

      $ strace -f -efile /bin/bash -c 'perl -v' 2>&1 | grep perl

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[reply]
[d/l]
        $strace -f -efile /bin/bash -c 'perl -v' 2>&1 | grep perl

execve("/bin/bash", ["/bin/bash", "-c", "perl -v"], [/* 17 vars */]) =
+ 0
stat64("/usr/local/sbin/perl", 0xbfde45f8 = -1 ENOENT (No such file or
+ directory)
stat64("/usr/local/bin/perl", {st_mode=S_IFREG|0755, st_size=1169915, 
+...}) = 0
stat64("/usr/local/bin/perl", {st_mode-S_IFREG|0755, st_size=1169915, 
+...}) = 0
execve("/usr/local/bin/perl", ["perl", "-v"], [/* 16 vars */]) = 0
This is perl, v5.10.1 (*) built for i686-linux... etc.

        [download]
[reply]
[d/l]
      Also try 
      sudo which perl

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      I think it's a matter of what's in PATH.
[reply]
[d/l]

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