10 Common shell scripts for combat and interview--1

# # #10个实战及面试常用的shell脚本

• Some considerations before writing the script
  • 1. Start with interpreter:

     #!/bin/bash  pre> 

  • 2. Syntax indentation, using 4 spaces, more attention to the description
  • 3. Naming rules:

      Variable name uppercase local variable lowercase function name Lowercase name shows the actual effect  

  • 4. The default variable is global, and the variable local in the function is specified as a local variable to avoid contaminating other scopes
  • 5. Two commands help debug scripts: Pre>SET-E encountered execution of non 0 O'Clock exit script set-x print execution
  • 6. After writing, test to production
• 1. Get the native IP address (some need to be modified according to the machine, not all Universal)

   method 1:ifconfig eth0 | grep "inet addr" | awk ' {print $} ' | Awk-f: ' {print $} ' method 2:ifconfig eth0|grep ' inet addr: ' |cut-d:-f2|cut-d ' "-f1method 3:ifconfig eth0|sed-nr ' 2s #^.*addr: (. *) bca.*$#\1#g ' pmethod 4:ifconfig eth0|sed-n '/inet/{s/.*addr://;s/. *//;p} ' method 5:ifconfig Eth0|awk '/ inet addr:/ {print $} ' |awk-f: ' {print $} ' method 6:ip add|awk-f ' [/]+ ' nr==8 {print $} '  

10 common shell scripts for combat and interviewing--1