Calling of one script from another script

jayawant01 · #1 (**permalink**) 06-10-08, 10:39

Hi all,
I m very new to shell scripting .Kindly bear with me if i ask too many silly questions.

My question is supposing I am calling one script inside another script
and the script which is been called has lot many functions defined in it ...

So is the entire script is called or I can invoke any selective part of the script and come back to my org script , if this is possible how can i identify how it goes back to the parent script

mike_bike_kite · #2 (**permalink**) 06-10-08, 11:16

Best to have a file that just contains your routines. It doesn't need a #!/bin/sh at the top or an exit at the bottom and it doesn't need to be executable. I've called my file "subs" and this is the contents:

Code:

my_sub ()
{
        echo in sub 1
}

my_other_sub ()
{
        echo in sub 2
}

I've now created a script file that can use these subs. It's included in the main file by the "." command and it just includes all the code in the subs file in my main file. Obviously there might be many scripts all using this set of subs. Note I'm calling the procedures (my_sub, my_other_sub) in the main script but not defining them there. I've called my main script "my_script" and this is the contents:

Code:

#!/bin/sh

. subs

echo test a

my_sub

echo test b

my_other_sub

echo test c

exit 0

To run the script I need to make the main script executable and then call it. I've included the output.

Code:

 chmod +x my_script
 ./my_script

test a
in sub 1
test b
in sub 2
test c

Hope that helps. I wouldn't get too worked up about procedural programming while shell scripting - it is powerfull but it's not a high level language.

Mike

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