how to write bash script

What is a Shell script? The simplest explanation is that a shell script is a file that contains a series of commands. The shell reads the file and executes all the commands in the file as if the commands were entered directly into the command line.The Shell is unique because it is not only a powerful command-line interface, but also a scripting language interpreter. As we'll see, most of the tasks that can

#需要交互的命令 expect "Pressentertocontinue." #有出现的字符串send "\ n" # After the above string appears, send the carriage return expect "Modificationfollow." #此为读取license底部出现的行send #发送多个空格send " "send" "send" "send" "expect" defaultto*: " #直到此处, require input select send "y\r" #自动输入中间还有很多略过 ... expecteof2.1 Executing a expect parameter instanceThe following uses SMBPASSWD batch to build the user to exampleBash script#!/bin/

1. Writing menu.sh Scripts#!/bin/bash#function menu () {cat 2. Write adminuser.sh script #!/bin/bash#clear .menu.shmenuwhiletrue;doread-p "pleaseinoputaoption:" optioncase $option in1) read-p "addauser:" name read-p "Setpasswdfortheuser : "passuseradd $name >/dev/null if[$?-eq0];then echo-e "\033[32;40m$nameiscreated S

particularly important script, the dry things can be destructive, accidentally by others. And most of the time we have a script that can have multiple functions, so we need to let the user choose to do it. #!/bin/bash#shellenvshell_name= "shell_template.sh" shell_dir= "/opt/shell" SHELL_LOG= "${SHELL_DIR}/${ Shell_name}.log "lock_file="/tmp/${shell_name}.lock "#

Author: cym As we all know, the importance of scripts is self-evident, especially in game engine development, Maybe the physical, artificial intelligence, animation, sound effects, and special effects of a game engine can be implemented using a third-party library, but the script engine cannot be a third-party one. You must write it yourself. With the script engi

In Linux has been learning for one months, today to write a small script, wrote three different, although simple, but you can see, I wrote the script is ping3 times to see if the host is alive!The first one is ~ ~ for~~ loop because I knocked it over at the terminal, so I copied it.For IP incat ip.txtDoFor count in {1..3}DoPING-C1-W1 $ip >/dev/nullIf [$?-eq 0];th

To write a program that imports data in batches, learn to write shell scripts! Now learn to use!============================================1, the first simple for loop#!/bin/bashFor I in 1 2 3 4;Doecho $i;Done2. Test for self-growing loops:#!/bin/bashfor ((I=1; iDoecho $i;DoneIf there is an error, no then skip:Syntax Error:bad for loop variableReason: The code is not wrong for standard

1. In the build environment, the server's password is often modified to ensure security and can be scripted with the shell.Using SSH to directly modify the password of the other server can be implemented with the SSH username @ login IP followed command, but requires the administrator to enter a password to operate, in order not to let the administrator manually input so solve this scenario with expect, because expect is a separate command in/bin/ Bash