Shell Programming for Loop

1. Grammatical structure

2. Case studies

2.1 Batch Decompression

#!/bin/bashcd/root/test/ls *.tar.gz > Ls.logls *.tgz >> ls.logfor i in $ (cat ls.log)        do                tar-zxf $i &A mp;>/dev/null        donerm-rf ls.log~                                                                           ~                                                                           ~                                                                                                                                                   "for2.sh" 11L, 145C

2.2 Adding a specified number of users in bulk

#!/bin/bashread-p "Input username:"-t-nameread-p "input Total No. of users: "-t-numread-p" Input password for users: "-t-pswif [! -Z "$name"-A! -Z "$num"-A!                -Z "$PSW"] then y=$ (echo $num | sed ' s/[0-9]//g ') if [-Z ' $y] Then For ((i=1;i<= $num; i=i+1)) Do/usr/sbin/useradd $name $ I &>/dev/null echo $pass |                                                                                  /USR/BIN/PASSWD--stdin $name $i &>/dev/null done fifi~                                                                                  ~                                                                                                                                                                 ~ "For4.sh" 19L, 422C 

2.3 Delete all regular users in bulk

#!/bin/bashusr=$ (cat/etc/passwd | grep/bin/bash | grep-v root | cut-d ":"-f1) for I in $usr        do                userdel-r $i 
   done~                                                                                  ~                                                                                  ~                                                                                                                                                                  "for5.sh" 9L, 127C

　　

Shell Programming for Loop