Difference between revisions of "How to use positional parameters"

From Linux Shell Scripting Tutorial - A Beginner's handbook
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Line 13: Line 13:
 
<source lang="bash">chmod +x cmdargs.sh
 
<source lang="bash">chmod +x cmdargs.sh
 
./cmdargs.sh bmw ford toyota</source>
 
./cmdargs.sh bmw ford toyota</source>
 +
Sample outputs:
 +
<pre>The script name : ./x
 +
The value of the first argument to the script : bmw
 +
The value of the second argument to the script : ford
 +
The value of the third argument to the script : toyota
 +
The number of arguments passed to the script : toyota
 +
The value of all command-line arguments : bmw ford toyota</pre>

Revision as of 14:48, 5 September 2009

All command line parameters ( positional parameters ) are available via special shell variable $1, $2, $3,...,$9.

How Do I Access Command-Line Arguments

Create a simple shell script called cmdargs.sh:

#!/bin/bash
echo "The script name : $0"
echo "The value of the first argument to the script : $1"
echo "The value of the second argument to the script : $2"
echo "The value of the third argument to the script : $3"
echo "The number of arguments passed to the script : $3"
echo "The value of all command-line arguments : $*"

Save and close the file. Rut it as follows:

chmod +x cmdargs.sh
./cmdargs.sh bmw ford toyota

Sample outputs:

The script name : ./x
The value of the first argument to the script : bmw
The value of the second argument to the script : ford
The value of the third argument to the script : toyota
The number of arguments passed to the script : toyota
The value of all command-line arguments : bmw ford toyota