Ques Post: 58990

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Top Forums Shell Programming and Scripting Ques Post 58990 by zazzybob on Tuesday 7th of December 2004 07:39:20 AM

12-07-2004

Registered User

This is all very dependent on how your shell script handles this. Seeing as you are supplying the compressed file as an argument to option "-f", then I would assume that the actual file opening and processing is handled internally within the script.

If, however, the script read from stdin, you could do
zcat somefile.Z | myscript

You can't do
myscript -f `zcat somefile.Z`
because that would expand the whole file and supply each word as an argument. Definitely not what you want!

You could add a handler to your shell script that looks at the supplied file's extension, and invokes zcat to read the file if it has a ".Z" extension.

EDIT: Please give your threads a more descriptive title than just "Ques". A descriptive, useful title will help people who have the appropriate knowledge find your post and help you out. Something like "Compressed file as a script argument" or similar would have been better for this post.

Cheers
ZB

Last edited by zazzybob; 12-07-2004 at 08:49 AM..

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LEARN ABOUT LINUX

shcomp

SHCOMP(1)						    User Environment Utilities							 SHCOMP(1)

NAME

       shcomp - compile a ksh93 shell script

SYNOPSIS

       shcomp [ options ] [infile] [outfile]]

ORIGIN OF THIS MAN PAGE

       This man page was written by Christophe Martin <Schplurtz@free.fr> for the Debian GNU/Linux system. It is based on "shcomp --man" output.

DESCRIPTION

       Unless  -D  is  specified,  shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh93 can read and execute
       with the same effect as the original script.

       Since aliases are processed as the script is read, alias definitions whose value requires variable expansion will not work correctly.

       If -D is specified, all double quoted strings that are preceded by $ are output. These are the messages	that  need  to	be  translated	to
       locale specific versions for internationalization.

       If  outfile is omitted, then the results will be written to standard output.  If infile is also omitted, the shell script will be read from
       standard input.

OPTIONS

       -D, --dictionary
	      Generate a list of strings that need to be placed in a message catalog for internationalization.

       -n, --noexec
	      Displays warning messages for obsolete or non-conforming constructs.

       -v, --verbose
	      Displays input from infile onto standard error as it reads it.

       --man  Displays this man page on standard error and exits.

       --help Shows a short help message and exits.

EXIT STATUS

       0      Successful completion.

       >0     An error occurred.

DEBIAN WARNING

       On a Debian GNU/Linux system, more than one package may provide ksh. the output of shcomp can only be used by ksh93.  Any other ksh will be
       unable to run the compiled script.

EXAMPLE

       ( echo '#! /bin/ksh93' ; shcomp myscript ) > myscript.bin &&
       chmod 755 myscript.bin
       ./myscript.bin

SEE ALSO

       ksh(1)

IMPLEMENTATION

       version	       shcomp (AT&T Labs Research) 2003-03-02
       author	       David Korn <dgk@research.att.com>
       copyright       Copyright (c) 1982-2005 AT&T Corp.
       license	       http://www.opensource.org/licenses/cpl1.0.txt

KSH93								  Fri Jun 3 2005							 SHCOMP(1)