linux中shell變數$#,$@,$0,$1,$2的含義解釋

來源:互聯網
上載者:User

摘抄自:ABS_GUIDE

:http://www.tldp.org/LDP/abs/abs-guide.pdf

linux中shell變數$#,$@,$0,$1,$2的含義解釋: 
變數說明: 
$$ 
Shell本身的PID(ProcessID) 
$! 
Shell最後啟動並執行後台Process的PID 
$? 
最後啟動並執行命令的結束代碼(傳回值) 
$- 
使用Set命令設定的Flag一覽 
$* 
所有參數列表。如"$*"用「"」括起來的情況、以"$1 $2 … $n"的形式輸出所有參數。 
$@ 
所有參數列表。如"$@"用「"」括起來的情況、以"$1" "$2" … "$n" 的形式輸出所有參數。 
$# 
添加到Shell的參數個數 
$0 
Shell本身的檔案名稱 
$1~$n 
添加到Shell的各參數值。$1是第1參數、$2是第2參數…。 

樣本:

  1 #!/bin/bash  2 #  3 printf "The complete list is %s\n" "$$"  4 printf "The complete list is %s\n" "$!"  5 printf "The complete list is %s\n" "$?"  6 printf "The complete list is %s\n" "$*"  7 printf "The complete list is %s\n" "$@"  8 printf "The complete list is %s\n" "$#"  9 printf "The complete list is %s\n" "$0" 10 printf "The complete list is %s\n" "$1" 11 printf "The complete list is %s\n" "$2

結果:

[Aric@localhost ~]$ bash params.sh 123456 QQThe complete list is 24249The complete list is The complete list is 0The complete list is 123456 QQThe complete list is 123456The complete list is QQThe complete list is 2The complete list is params.shThe complete list is 123456The complete list is QQ
相關文章

聯繫我們

該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.