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Full Discussion: Troubles with shell script
Top Forums Shell Programming and Scripting Troubles with shell script Post 302510741 by Simonpalmieri on Monday 4th of April 2011 08:58:36 PM
Old 04-04-2011
Troubles with shell script

Hello. I'm having trouble figuring out how to write this script. I'm supposed to have my script start up with specific arguments and if there are missing arguments or invalid arguments, return an error associated to its errorlevel number.
For example, here are a few errorlevel numbers with their event information.

16 Third argument present, but not what expected (“-o”)
17 Fourth argument missing on command line
18 Too many arguments provided on command line (>4)

First off, i'm supposed to execute my shell script with these specific arguments :

Code:
Testscript.sh -i ./input.txt -o ./output.txt

I've added the following to my script to make sure the script is started with those arguments :

Code:
$# = 4

$0 = ./testscript.sh

$1 = "-i"

$2 = "./input.txt"

$3 = "-o"

$4 = "./output.txt"

$@ = " -i ./input.txt -o ./output.txt"

The part i can't seem to figure out is how to get my script to return an error and an errorlevel number. I was thinking maybe using IF statements in conjungtion with the $? variable but i'm not totally sure. Help would be much appreciated.

Thanks.
 

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SHCOMP(1)						       Korn shell utilities							 SHCOMP(1)

NAME
shcomp - compile a shell script SYNOPSIS
shcomp [ options ] [infile [outfile]] DESCRIPTION
Unless -D is specified, shcomp takes a shell script, infile, and creates a binary format file, outfile, that ksh 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 warn- ing messages for obsolete or non-conforming constructs. [v verbose] Displays input from infile onto standard error as it reads it. EXIT STATUS
0 Successful completion. >0 An error occurred. SEE ALSO
ksh(1) IMPLEMENTATION
version shcomp (AT&T Research) 2003-03-02 author David Korn <dgk@research.att.com> copyright Copyright (c) 1982-2010 AT&T Intellectual Property license http://www.opensource.org/licenses/cpl1.0.txt 2003-03-02 SHCOMP(1)
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