Shulou(Shulou.com)06/01 Report--

Two practical examples of Shell script analysis, I believe that many inexperienced people do not know what to do, so this paper summarizes the causes of the problem and solutions, through this article I hope you can solve this problem.

Today, we mainly share two examples of shell scripts, the content is not important, the focus is to see how to implement.

1. Create users with special requirements in batch

Requirements: batch create 10 system accounts hwb01-hwb10 and set password (password is random number, requires mixed characters and numbers, etc.).

Script:

#! / bin/bash # File Name: add_user.sh # # Passwd_File=/tmp/ `uidgen`.txt > $Passwd_File chmod 400 $Passwd_File for i in hwb {01.10} do userdel-r "$I" & > / dev/null id $I & > / dev/null if [$?-ne 0] then useradd $I PassWd= `uuidgen` echo $PassWd | passwd-- stdin $I & > / dev/null echo "user name: $I password: $PassWd" > $Passwd_File echo-e "\ 033 [32m $I user created successfully! \ 033 [0m "else echo" $I user already has "fi if [" $I "=" hwb10 "] then echo" user password Please check the file $Passwd_File "fi done

Results:

Ps: batch create users and set random passwords (without using shell loops)

Method 1:

Echo user {1... 20} | xargs-N1 | sed-r's # (. *) # useradd\ 1\ &\ & echo\ 1 > > / tmp/passwd.txt\ &\ & echo $RANDOM | md5sum | cut-c 1-5 > > / tmp/passwd.txt\ & & echo `tail-1 / tmp/ passwd.txt` | passwd-stdin\ 1passg` | bash

Method 2:

Echo user {1... 20} | xargs-N1 | sed-r's # (. *) # useradd\ 1\ & pass= `echo $RANDOM | md5sum | cut-c 1-5`\ & echo $pass | passwd-stdin\ 1\ & echo\ 1$ pass > > / tmp/user_passwd.txt#g' | bash

Method 3:

Echo user {1... 20} | xargs-N1 | sed-r's # (. *) # useradd\ 1\ & pass= `echo $RANDOM | md5sum | cut-c 1-5`\ & echo\ 1:$pass > > / tmp/user_passwd.txt\ &\ & chpasswd

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