How to pass multiple flag and multiple arguments in getopts in shell script? [duplicate]

Question

Answer given here doesn't here any of my questions: bash getopts with multiple and mandatory options

I am new to shell script and trying to write a shell script with getopts meanwhile I couldn't find answers to the below questions. Can somebody please help here?

This is the script I've started writing:

 #!/bin/bash while getopts c:t:x: option ; do case $option in c) java -jar $file --fail-if-no-tests --include-classname "$OPTARG" --scan-class-path $file --include-tag regression ;; t) java -jar $file --fail-if-no-tests --include-classname '.*' --scan-class-path $file --include-tag "$OPTARG" ;; c | t) java -jar $file --fail-if-no-tests --include-classname "$OPTARG" --scan-class-path $file --include-tag "$OPTARG" ;; *) usage esac done

How do I pass multiple flags? For example runner.sh -c classname -t tagname I Tried using ct, c|t in the getopts but did not work.
How do I pass multiple arguments for one flag? For example runner.sh -g arg1 arg2
Is there a way if I don't provide any flag it will run by default statement. I tried to achieve this using * but there is one issue with this approach. In case the wrong flag is provided it will always run default statement.

1. Every flag (i.e. -c and -t) has its own argument (i.e. classname and tagname), so why do you want to use ct or c|t? You can use ct when flags do not take arguments I guess. 2. You can try putting arguments in quotes like runner.sh -g "arg1 arg2". — nino
– nino, Commented May 7, 2021 at 3:46
@nino 1. I need to provide an option where user can pass argument for both (-c and -t) at the same time like runner.sh -c classname -t tagname the script i have above only picks up -c because it comes first. 2. I tried using double quotes but did not work. — pk786
– pk786, Commented May 7, 2021 at 3:55
@nino Looks like this should work for me. Can you also advise how do I check two variables are empty or not? I am trying to use [ -z "$CLASSNAME" && -z "$TAGNAME"] but not working. — pk786
– pk786, Commented May 7, 2021 at 4:32
I think you can use double brackets [[ -z "$CLASSNAME" && -z "$TAGNAME"]] or [ -z "$CLASSNAME" ] && [ -z "$TAGNAME"] — nino
– nino, Commented May 7, 2021 at 4:43

nino · Accepted Answer · 2021-05-07 04:02:16Z

while getopts 'c:t:x:' option; do case "$option" in c ) classname="$OPTARG" ;; t ) tagname="$OPTARG" ;; x ) xvar="$OPTARG" ;; esac done ## now you can use the variables in your command

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