Argument parsing in bash [duplicate]

Question

I am new to bash. Need suggestion for the following problem.

So I want to execute the script in this way

./myscript --bootstrap bootstrap.exe --vmmount ./vmmount --image /dev/sdb2 --target-exe installer.exe [--internal-exe] param1 param2 param3 ...

Argument parser i have done:

VMMOUNT="" BOOTSTRAP="" IMAGE_FILE="" TARGET_EXE="" INTERNAL_EXE="" while : ; do if [ "$1" = "--vmmount" ] ; then [ -n "${VMMOUNT}" ] && usage VMMOUNT="$2" shift shift elif [ "$1" = "--bootstrap" ] ; then [ -n "${BOOTSTRAP}" ] && usage BOOTSTRAP="$2" shift shift elif [ "$1" = "--image" ] ; then [ -n "${IMAGE_FILE}" ] && usage IMAGE_FILE="$2" shift shift elif [ "$1" = "--target-exe" ] ; then [ -n "${TARGET_EXE}" ] && usage TARGET_EXE="$2" shift shift elif [ "$1" = "--internal-exe" ] ; then [ -n "${INTERNAL_EXE}" ] && usage INTERNAL_EXE="true" shift shift else break fi done my_method "${IMAGE_FILE}" "${VMMOUNT}" "${BOOTSTRAP}" "${TARGET_EXE}" "${INTERNAL_EXE}"

Now I have confusion in parsing the parameters param1 and param2 etc. How to parse them ? Can I use $@ to take the params as array or any other efficient way ?

Instead of all those elif statements, use case.

Barmar
– Barmar

2013-01-04 07:27:49 +00:00
Commented Jan 4, 2013 at 7:27 — Barmar
– Barmar, Commented Jan 4, 2013 at 7:27

Barmar · Accepted Answer · 2013-01-04 07:36:19Z

VMMOUNT="" BOOTSTRAP="" IMAGE_FILE="" TARGET_EXE="" INTERNAL_EXE="" while : ; do case "$1" in --vmmount) [ -n "${VMMOUNT}" ] && usage VMMOUNT="$2" shift 2 ;; --bootstrap) [ -n "${BOOTSTRAP}" ] && usage BOOTSTRAP="$2" shift 2 ;; --image) [ -n "${IMAGE_FILE}" ] && usage IMAGE_FILE="$2" shift 2 ;; --target-exe) [ -n "${TARGET_EXE}" ] && usage TARGET_EXE="$2" shift 2 ;; --internal-exe) [ -n "${INTERNAL_EXE}" ] && usage INTERNAL_EXE="true" shift ;; *) break ;; esac done my_method "${IMAGE_FILE}" "${VMMOUNT}" "${BOOTSTRAP}" "${TARGET_EXE}" "${INTERNAL_EXE}" "$@"

Don't forget to enclose $@ in double quotes.

Community · Accepted Answer · 2017-05-23 11:53:57Z

I would suggest you use getopt to parse your command line arguements instead of hand coding it. It should save a lot of time.

Also shown in How do I parse command line arguments in Bash?

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