Newbies problem - UNIX for Dummies Questions & Answers

greenhorn · #1 (**permalink**) 02-07-2006

Hi
I am new to Unix and need help. How do I use the $@ in my script to direct the executing of commands on various files.
Thanks

curious greenhorn

jim mcnamara · #2 (**permalink**) 02-07-2006

Your question needs some clarification.

$@ returns command line parameters. What exactly are you trying to do?

greenhorn · #3 (**permalink**) 02-07-2006

Sorry for my unclear query earlier

Recently, I read something about the variable $@ but do not really know how to use it. My problem is as follows:
I have written a script such as:

#!/bin/bash
awk ' {....
}'

I would like to execute this script on afew datafiles, with different names ( .txt). How can I use $@, so that it automatically execute the commands on all files, one after another?
Hope you can help! Thanks

cheers
curious greenhorn

Ygor · #4 (**permalink**) 02-07-2006

You could use a for loop, e.g....

Code:

#!/usr/bin/bash
for i
do
   : some command using $i
done

...but if you are using awk, then you can just use...

Code:

#!/usr/bin/bash
awk '{
  ...
  }' $@

greenhorn · #5 (**permalink**) 02-08-2006

Hi
Thank you for your explanation.
If I were to use the awk version and end it with $@, how can I execute the command to a list of filenames (I have numereous files and have listed the names in a list.txt file)?

curious grennhorn

Ygor · #6 (**permalink**) 02-08-2006

Like this...

Code:

#!/usr/bin/bash
awk '{
  ...
  }' $(<list.txt)

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