Created
September 17, 2015 14:15
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Parse arguments in a bash script. Example.
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| #!/bin/bash | |
| #Are arguments given? | |
| if [ $# -eq 0 ]; then | |
| #No... Exit. | |
| echo "Arguments required!" | |
| exit 1 | |
| fi | |
| #Use getopts to parse arguments | |
| # ...getopts "<Letters to check>" ... | |
| # <Letters to check>: | |
| # Begin with ":" to avoid error output | |
| # Example: "ab:c" <- Check for Arguments -a and -c without extra parameter. | |
| # and check for -b with additional parameter | |
| while getopts ":ab:c" opt; do | |
| case $opt in | |
| a) | |
| echo "Option a!" | |
| ;; | |
| b) | |
| echo "Option b! Parameter: $OPTARG" | |
| ;; | |
| c) | |
| echo "Option c!" | |
| ;; | |
| \?) | |
| #Triggered when found invalid argument | |
| echo "Invalid option: -$OPTARG" | |
| exit 1 | |
| ;; | |
| :) | |
| #Triggered when required parameter is missing | |
| #This example: Executed script with just -b | |
| echo "Option -$OPTARG requires an argument." | |
| exit 1 | |
| ;; | |
| esac | |
| done |
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