Could you please try following script as follows, hope it may help you. :) echo "Option -$OPTARG requires an argument."
exit 1
Above code will check if a option let's say -f is given while running script but no option was passed it will catch it.
Now come on to the OPTIND, if we read the man page then we will get to know that OPTIND
Quote:
is initialized to 1 each time the shell or a shell script is invoked. When an option requires an argument, getopts places that argument into the variable OPTARG. The shell does not reset OPTIND automatically; it must be manually reset.
So I am checking here if it's value is 1 then it means no argument was provided while running script.
Script run without argument:
Script run with option and argument:
Script run with option without argument:
Hope this helps.
Thanks,
R. Singh
This User Gave Thanks to RavinderSingh13 For This Post:
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