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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ## if 判斷一個文件是否存在 ``` [ -f /etc/passwd ] && echo "yes" || echo "no" ``` 判斷一類文件(*.c)是否存在 ``` [ $(ls *.c 2> /etc/null) ] && echo "yes" || echo "not" ``` 判斷一個文件是否存在(腳本) ``` #!/bin/bash if [ -f /etc/passwd ]; then echo "there" else echo "not there" fi ``` 判斷遠程服務器端口是否通 ``` #!/bin/bash nc -zv www.baidu.com 80 &> /dev/null if [ $? -eq 0 ] then echo "up" else echo "down" fi ``` 自定義 ``` #!/bin/bash result="fail" if [ $result == "success" ] then echo "success" else echo "fail" fi ``` 與 或 ``` if [[ $a != 1 && $a !=2 ]] if [[ $a != 1 || $a !=2 ]] ``` ## case case案例 ``` #!/bin/bash read -p "Please enter your city:" your_city echo -n "The prefix phone number of $your_city is " case $your_city in Beijing | BEIJING | beijing) echo "010" ;; Shanghai | SHANGHAI | shanghai) echo "021" ;; Shenzhen | SHENZHEN | shenzhen) echo "0755" ;; *) echo "to be continued..." ;; esac ```
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                              哎呀哎呀视频在线观看