Check for flag passed to a Bash script and process value [duplicate]

Question

I have a bash script in which I want to check if a flag with value was passed to it and then use the value in a variable. Something like this (pseudocode):

file.sh -c 1.0.0

inside file.sh :

#!/bin/bash get flag: if flag 'c' then curl c else curl 'something else'

Whats the most optimal way to do the above?

@TharangaAbeyseela what if no argument if passed ? the script would just fail. — Scooby
– Scooby, Commented Feb 17, 2017 at 22:01
please check the answer. sorry i hit the enter before completion :) — Tharanga Abeyseela
– Tharanga Abeyseela, Commented Feb 17, 2017 at 22:09
BashFAQ #35 covers the topic in detail. Note that getopt is not a preferred solution. — Charles Duffy
– Charles Duffy, Commented Feb 17, 2017 at 22:10

Tharanga Abeyseela · Accepted Answer · 2017-02-17 22:08:29Z

try the following

#!/bin/bash while getopts ":c" opt; do case $opt in c) echo "-c was triggered!" >&2 ;; \?) echo "Invalid option: -$OPTARG" >&2 ;; esac done

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