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Shell腳本傳參數方法總結

   這篇文章主要介紹了Shell腳本傳參數方法總結,本文著重講解傳遞固定個數參數的方法、可變個數參數的方法兩部份內容,需要的朋友可以參考下

  一、接收固定長度的參數

   代碼如下:

  [root@svn shell_example]# cat params.sh

  #!/bin/bash

  #傳參測試腳本

  echo "My name is `basename $0` -I was called as $0"

  echo "My first parameter is : $1"

  echo "My second parameter is : $2"

  空參數執行

  代碼如下:

  [root@svn shell_example]# sh params.sh

  My name is params.sh -I was called as params.sh

  My first parameter is :

  My second parameter is :

  傳遞2個參數執行

   代碼如下:

  [root@svn shell_example]# sh params.sh one two

  My name is params.sh -I was called as params.sh

  My first parameter is : one

  My second parameter is : two

  二、那如果還有參數怎麼辦呢?還要一個個加上來嗎?答案是否定的

  以下用法應該不陌生,就是直接執行腳本本身,沒有附帶任何參數,那麼腳本講拋出幫助信息.即怎麼使用此腳本.見紅字部分

   代碼如下:

  [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 first second

  You provided 0 parameters,but 2 are required.

  代碼如下

   代碼如下:

  [root@svn shell_example]# cat params_v2.sh

  #!/bin/bash

  # 這是個測試腳本傳參的測試例子

  echo "My name is `basename $0` -I was called as $0"

  echo "I was called with $# parameters."

  if [ "$#" -eq "2" ];then

  echo "My first parameter is $1"

  echo "My second parameter is $2"

  else

  echo "Usage: `basename $0` first second"

  echo "You provided $# parameters,but 2 are required."

  fi

  詳細的執行過程如下

  不傳參數執行

   代碼如下:

  [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 first second

  You provided 0 parameters,but 2 are required.

  傳遞3個參數執行

   代碼如下:

  [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 first second

  You provided 3 parameters,but 2 are required.

  傳遞2個參數執行

   代碼如下:

  [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 first parameter is one

  My second parameter is two

  問題來了,要是後期還要加參數怎麼辦呢?或者我也不確定到底會傳幾個參數.

  解決方法如下,詳細執行結果如下

   代碼如下:

  [root@svn shell_example]# cat manyparams.sh

  #!/bin/bash

  #這是個測試腳本傳N個參數的例子

  echo "我的名字是 `basename $0` - 我是調用自 $0"

  echo "我有 $# 參數"

  count=1

  while [ "$#" -ge "1" ];do

  echo "參數序號為 $count 是 $1"

  let count=count+1

  shift

  done

  一個參數執行

  [root@svn shell_example]# sh manyparams.sh one

  我的名字是 manyparams.sh - 我是調用自 manyparams.sh

  我有 1 參數

  參數序號為 1 是 one

  5個參數執行

   代碼如下:

  [root@svn shell_example]# sh manyparams.sh one two three four five

  我的名字是 manyparams.sh - 我是調用自 manyparams.sh

  我有 5 參數

  參數序號為 1 是 one

  參數序號為 2 是 two

  參數序號為 3 是 three

  參數序號為 4 是 four

  參數序號為 5 是 five

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