Difference between revisions of "How to use positional parameters"
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All command line parameters ( positional parameters ) are available via special shell variable $1, $2, $3,...,$9. | All command line parameters ( positional parameters ) are available via special shell variable $1, $2, $3,...,$9. | ||
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|restart, and cyberciti.biz | |restart, and cyberciti.biz | ||
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Revision as of 20:37, 21 September 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 : $*"
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 : 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/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/rc.d/jail | 2 | restart, and cyberciti.biz | ||
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