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Full Discussion: How to make shell script arguments optional?
Top Forums Shell Programming and Scripting How to make shell script arguments optional? Post 302586305 by guitarscn on Saturday 31st of December 2011 11:44:37 AM
Old 12-31-2011
How to make shell script arguments optional?
Here is my script:

Code:
#!/bin/ksh

usage ()
{
     echo " Usage: $0 <opt1> <opt2> <opt3> <opt4>"
}

if [ $# -lt 3 ]; then
        usage
        exit;
fi

prog -a $1 -b $2 -c $3 -d $4 2>&1 | tee -a ~/$1.log

I want argument 4 to be optional, so if there's no argument for opt4, that it doesn't execute the -d argument in the actual program called 'prog'
 

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fixcrio

fixcrio(1)                                                    General Commands Manual                                                   fixcrio(1)

NAME

       fixcrio - inserts missing CRs at the ends of lines.

SYNOPSIS

       fixcrio prog

DESCRIPTION

       fixcrio runs prog.  It inserts CR at the end of each line of input or output to prog that does not have a CR.

       fixcrio runs as a child process of prog.  It exits when it sees the end of prog's output.

SEE ALSO

       tcpserver(1),  tcprules(1),  tcprulescheck(1),  argv0(1),  recordio(1), rblsmtpd(1), tcpclient(1), who@(1), date@(1), finger@(1), http@(1),
       tcpcat(1), mconnect(1), tcp-environ(5)

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