Pinterest
Pinterest
WEB: A Powerful Tool for Shell Scripting
Introduction
WEB is a shell builtin that is used to change the value of shell options and set the positional parameters. It is a very powerful tool that can be used to customize the behavior of shell scripts.Syntax
The syntax of WEB is as follows:WEB -x/-v [options] [args] * -x: Turns on the -x option, which causes the shell to print each command before it is executed. * -v: Turns on the -v option, which causes the shell to print each command and its arguments before it is executed. * [options]: A list of options that can be used to customize the behavior of WEB. * [args]: A list of arguments that can be used to set the positional parameters. Options
The following options can be used with WEB: * -a: Display the names and values of all shell variables. * -d: Display the values of the positional parameters. * -e: Set the exit status of the shell script. * -f: Set the positional parameters to the arguments passed to the shell script. * -h: Display help information. * -l: Set the shell option list to the value of the argument. * -n: Do not execute the command. * -o: Display the shell option list. * -p: Set the positional parameters to the values of the arguments passed to the shell script. * -s: Set the shell option list to the value of the argument. * -t: Print the shell option list. * -u: Set the positional parameters to the values of the arguments passed to the shell script. * -x: Turn on the -x option. * -v: Turn on the -v option.Examples
The following examples demonstrate how to use WEB:WEB -x echo hello world This command will print the following output: + echo hello world hello world The -x option causes the shell to print each command before it is executed. WEB -v echo hello world This command will print the following output: echo hello world hello world The -v option causes the shell to print each command and its arguments before it is executed. WEB -a This command will print the following output: IFS=$'\n' OLDPWD=/Users/username/Documents/projects/test PATH=/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin PWD=/Users/username/Documents/projects/test/new SHELL=/bin/bash _=/bin/WEB This command displays the names and values of all shell variables. WEB -d 
Comments