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Full Discussion: Pass arguments to bash script
Top Forums Shell Programming and Scripting Pass arguments to bash script Post 302832419 by Don Cragun on Sunday 14th of July 2013 10:57:56 PM
Old 07-14-2013
Self modifying code is generally not a good idea. Would you consider something like the following instead?
Code:
#!/bin/bash
IAm=${0##*/}
IAmDone=".$IAm"
ARGA=$1

if [ -f "$IAmDone" ]
then
        date
        exit
fi

if [ "${ARGA}" = "jsmith" ]
then    echo "${ARGA}:Confirmed"
        touch "$IAmDone"
else    echo "${ARGA}:Unconfirmed"
fi

This will work like your script originally worked until it confirms that jsmith was passed in as an argument. Any time it is called after that, it will just print the current date and exit. For example, the following commands:
Code:
./myscript.sh abc;./myscript.sh jsmith;./myscript.sh abc;./myscript.sh jsmith

produces the output:
Code:
abc:Unconfirmed
jsmith:Confirmed
Sun Jul 14 19:53:06 PDT 2013
Sun Jul 14 19:53:06 PDT 2013

Last edited by Don Cragun; 07-14-2013 at 11:59 PM.. Reason: Fix autocorrection induced typo.
This User Gave Thanks to Don Cragun For This Post:
SkySmart
 

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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)
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