Bash Scripting with Parameters Multiple Parameter Parsing
Example
To parse lots of parameters, the prefered way of doing this is using a while loop, a case statement, and shift.
shift is used to pop the first parameter in the series, making what used to be $2, now be $1. This is useful for processing arguments one at a time.
#!/bin/bash
# Load the user defined parameters
while [[ $# > 0 ]]
do
case "$1" in
-a|--valueA)
valA="$2"
shift
;;
-b|--valueB)
valB="$2"
shift
;;
--help|*)
echo "Usage:"
echo " --valueA \"value\""
echo " --valueB \"value\""
echo " --help"
exit 1
;;
esac
shift
done
echo "A: $valA"
echo "B: $valB"
Inputs and Outputs
$ ./multipleParams.sh --help
Usage:
--valueA "value"
--valueB "value"
--help
$ ./multipleParams.sh
A:
B:
$ ./multipleParams.sh --valueB 2
A:
B: 2
$ ./multipleParams.sh --valueB 2 --valueA "hello world"
A: hello world
B: 2
