advantages of Perl ? Post: 302128649

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Top Forums Shell Programming and Scripting advantages of Perl ? Post 302128649 by Perderabo on Wednesday 25th of July 2007 11:35:32 PM

07-26-2007

Administrator Emeritus

There are tasks that are very hard or impossible even with a powerful shell like ksh. Example: unix keeps time internally in seconds since the epoch. What date and time would 1164876000 correspond to? That would be a complex shell script if you had only a Posix shell and Posix utilities to work with. Perl solution:

perl -e 'print scalar localtime(shift),"\n"' 1164876000

Perl can manipulate text quite adroitly but so can Posix shells. I switch to perl when my requirements exceed the power of a shell. Often I use perl to write one-liners as above to assist the shell. While I doubt that you could write a device driver in perl, perl approaches c in power.

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LEARN ABOUT SUNOS

suspend

suspend(1)							   User Commands							suspend(1)

NAME

       suspend - shell built-in function to halt the current shell

SYNOPSIS

   sh
       suspend

   csh
       suspend

   ksh
       suspend

DESCRIPTION

   sh
       Stops the execution of the current shell (but not if it is the login shell).

   csh
       Stop the shell in its tracks, much as if it had been sent a stop signal with ^Z. This is most often used to stop shells started by su.

   ksh
       Stops the execution of the current shell (but not if it is the login shell).

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       csh(1), kill(1), ksh(1), sh(1), su(1M), attributes(5)

SunOS 5.10							    15 Apr 1994 							suspend(1)