A summary of the method of shell script passing parameters _linux Shell

First, receive the fixed length of the parameter

Copy Code code as follows:

[Root@svn shell_example]# Cat params.sh
#!/bin/bash
#传参测试脚本
echo "My name is ' basename $ ' I ' called as $"
echo "My I-parameter is: $"
echo "My second parameter are: $"

Null parameter execution

Copy Code code as follows:

[ROOT@SVN shell_example]# SH params.sh
My name is Params.sh-i was called as params.sh
My-parameter is:
My second parameter are:

Pass 2 parameter execution

Copy Code code as follows:

[ROOT@SVN shell_example]# sh params.sh One Two
My name is Params.sh-i was called as params.sh
My i-Parameter is:one
My second parameter is:two

second, what if there are parameters to do? Do you want to add each one? The answer is No.

The following usage should be familiar, that is, directly executing the script itself without any arguments, then the script throws out the help information. That's how to use this script. See the Scarlet Letter Section

Copy Code code as follows:

[ROOT@SVN shell_example]# SH params_v2.sh
My name is Params_v2.sh-i was called as params_v2.sh
I was called with 0 parameters.
Usage:params_v2.sh-Second
You provided 0 Parameters,but 2 are required.

The code is as follows

Copy Code code as follows:

[Root@svn shell_example]# Cat params_v2.sh
#!/bin/bash
# This is a test example of a test script argument

echo "My name is ' basename $ ' I ' called as $"
echo "I am called with $# parameters."

If ["$#"-eq "2"];then
echo "My-parameter is $"
echo "My second parameter are $"
Else
echo "Usage: ' basename $ ' second '
echo "You provided $# Parameters,but 2 are required."
Fi

The detailed execution process is as follows
Do not pass parameter execution

Copy Code code as follows:

[ROOT@SVN shell_example]# SH params_v2.sh
My name is Params_v2.sh-i was called as params_v2.sh
I was called with 0 parameters.
Usage:params_v2.sh-Second
You provided 0 Parameters,but 2 are required.

Pass 3 parameter execution

Copy Code code as follows:

[ROOT@SVN shell_example]# SH params_v2.sh One Two three
My name is Params_v2.sh-i was called as params_v2.sh
I was called with 3 parameters.
Usage:params_v2.sh-Second
You provided 3 Parameters,but 2 are required.

Pass 2 parameter execution

Copy Code code as follows:

[ROOT@SVN shell_example]# sh params_v2.sh One Two
My name is Params_v2.sh-i was called as params_v2.sh
I was called with 2 parameters.
My I-parameter is one
My second parameter is two

The question comes, if later still need to add the parameter how to do? Or I'm not sure I'm going to pass a few parameters.
The solution is as follows, detailed implementation results are as follows

Copy Code code as follows:

[Root@svn shell_example]# Cat manyparams.sh
#!/bin/bash
#这是个测试脚本传N个参数的例子

echo "My name is ' basename $ '--I was calling from $
echo "I have $# parameters."

Count=1
While ["$#"-ge "1"];d o
echo "parameter number is $count is $"
Let Count=count+1
Shift
Done

A parameter executes

[ROOT@SVN shell_example]# sh manyparams.sh One

My name is manyparams.sh-I was calling from manyparams.sh
I have 1 parameters.
The argument number 1 is one

5 parameter execution

Copy Code code as follows:

[ROOT@SVN shell_example]# SH manyparams.sh One two three four five

My name is manyparams.sh-I'm calling from manyparams.sh
I have 5 parameters
Argument number 1 is one
parameter number is 2 is two
parameter ordinal is 3 is three
parameter ordinal is 4 is four
The argument number 5 is five