Difference between revisions of "How to use positional parameters"
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The value of the third argument to the script : toyota | The value of the third argument to the script : toyota | ||
The number of arguments passed to the script : 3 | The number of arguments passed to the script : 3 | ||
| − | The value of all command-line arguments : bmw ford toyota</pre> | + | The value of all command-line arguments ($* version) : bmw ford toyota |
| + | The value of all command-line arguments ($@ version) : bmw ford toyota</pre> | ||
Try the following examples: | Try the following examples: | ||
<source lang="bash">ls /tmp | <source lang="bash">ls /tmp | ||
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|restart, and cyberciti.biz | |restart, and cyberciti.biz | ||
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| + | [[Category:Conditional Execution]][[Category:commands]] | ||
{{navigation | {{navigation | ||
|previous=Shell command line parameters | |previous=Shell command line parameters | ||
|next=Parameters Set by the Shell}} | |next=Parameters Set by the Shell}} | ||
Revision as of 21:56, 19 October 2009
← Shell command line parameters • Home • Parameters Set by the Shell →
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 : $#"
echo "The value of all command-line arguments (\$* version) : $*"
echo "The value of all command-line arguments (\$@ version) : $@"
Save and close the file. Rut it as follows:
chmod +x cmdargs.sh
./cmdargs.sh bmw ford toyota
Sample outputs:
The script name : ./cmdargs.sh The value of the first argument to the script : bmw The value of the second argument to the script : ford The value of the third argument to the script : toyota The number of arguments passed to the script : 3 The value of all command-line arguments ($* version) : bmw ford toyota The value of all command-line arguments ($@ version) : bmw ford toyota
Try the following examples:
ls /tmp
./math 10 + 2
~/scripts/addzone cyberciti.com
~/scripts/adddomain cyberciti.biz '74.86.48.99' '2607:f0d0:1002:11::4'
/etc/init.d/named reload
/usr/local/etc/rc.d/jail restart cyberciti.biz
| Shell script name ($0) | Total number of arguments ($#) | Actual Command line argument ($1,..,$9) | ||
|---|---|---|---|---|
| ls | 1 | /tmp | ||
| ./math | 3 | 10, +, and 3 | ||
| ~/scripts/addzone | 1 | cyberciti.com | ||
| ~/scripts/adddomain | 3 | cyberciti.biz, 74.86.48.99, and 2607:f0d0:1002:11::4 | ||
| /etc/init.d/named reload | 1 | reload | ||
| /usr/local/etc/rc.d/jail | 2 | restart, and cyberciti.biz | ||
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