Passing arguments to a bash source file

[DJM]

Is it possible to pass arguments to a source file in a bash script? For example

#!/bin/sh
#

. /dir1/dir1/funclib -a -b

How would you check for the passed arguments in funclib without getting confused with any arguments passed to the main script?

Thanks
Don

[nmset]

There does not seem to be any confusion, both scripts process their arguments independantly. Can you elaborate more on expected or observed problems ?

[Cabhan]

Within a script, you can check the $1, $2, etc. variables for the arguments to the script.

These variables are parsed independently for each script. As an example:

alex@danu:~/test/bash$ cat main_script.sh
#!/bin/bash

echo "main_script.sh: First argument: $1"
source source_script.sh bar
alex@danu:~/test/bash$ cat source_script.sh 
#!/bin/bash

echo "source_script.sh: First argument: $1"
alex@danu:~/test/bash$ bash main_script.sh foo
main_script.sh: First argument: foo
source_script.sh: First argument: bar

[DJM]

I created two test scripts - main.sh and mainsrc.sh. Here they are.

main.sh

#!/bin/sh
#	main.sh

. ./mainsrc.sh -x -y -z

while getopts :abc opt
do
	case "$opt" in
		*)
			echo "main: ${opt}"
		;;
	esac
done

mainsrc.sh

#!/bin/sh
#	mainsrc.sh

while getopts :abcxyz opt
do
	case "$opt" in
		*)
			echo "mainsrc: ${opt}"
		;;
	esac
done

when I run main.sh -a -b -c I get the following output.

[~] # ./main.sh -a -b -c
mainsrc: x
mainsrc: y
mainsrc: z

If I changed main.sh to the following:

#!/bin/sh
#	main.sh

while getopts :abc opt
do
	case "$opt" in
		*)
			echo "main: ${opt}"
		;;
	esac
done	

. ./mainsrc.sh -x -y -z

I get the following output when I run it:

[~] # ./main.sh -a -b -c
main: a
main: b
main: c

So as you can see they are interferring with each other. How to solve this?

Don

[nmset]

From BASH man page

The shell does not reset OPTIND automatically; it must be manually reset between multiple calls to getopts within the same shell invocation if a new set of parameters is to be used.

Adding

OPTIND=1

after every getopts full completion resolved the issue. So the problem lies in the way getopts is built.

[DJM]

Excellent! So simple. It solves the problem. Thanks.