Pass parameters to Shell

原創

发布：Memory, Renee 于 2017-11-05 09:14:52

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Pass parameters to shell scripts when executing shell scripts. Use $n to get parameters in scripts. N stands for numbers, 0 is the executed shell script name , 1 is the first parameter executed in the script, 2 is the second paramenter execute, and so on.

Write a shell script and name it as test.sh which includes

#!/bin/bash
output "Shell output script name and parameters";
output "Executed script name：$0";
output "First parameter：$1";
output "Second parameter：$2";
output "Third parameter：$3";

Run the script and output

$ chmod +x test.sh 
$ ./test.sh 1 2 3

Output

Executed script name：./test.sh
First parameter：1
Second parameter：2
Third parameter：3

The followings are often used except what has been mentioned above.

Parameter	Note
$#	Numbers of parameters passed to shell
$*	Use an unit string to display paramteres passed to all scripts. For example, "$*". Use「"」and output all parameters as "$1 $2 … $n".
$$	Current Process ID of the script.
$!	Last process ID run at the backend.
$@	It is the same as $* but quotation marks are used to quote the paramenter returned. For example, "$@". Use「"」and output all parameters as "$1" "$2" … "$n".
$-	Display current options Shell applies. Its feature is the same as set.
$?	Display the status of last command Quit. 0 means no error, otherwise means there is an error.