Tks a lot for your help!! this is the Info i get when type the command... I try to run perl5.8.8 and i couldn't.

Would you pls help me again?

#
# whereis perl
perl: /usr/bin/perl
# cd /usr/bin/perl
# ls -la
total
80
drwxrwxrwx 2 root system 8192 Feb 28 14:53 .
drwxr-xr-x 3 root system 8192 Mar 1 15:34 ..
-rwxr-x--- 1 root system 32768 Feb 22 12:44 perl5.6.2
-rw-r--r-- 1 root system 32768 Mar 1 15:19 perl5.8.8
# perl5.8.8
perl5.8.8: not found
#