/bin/bash## Name: test-bucket-1## Purpose:# Performs the test-bucket number 1 for Product X.# (Actually, this is a sample shell script,# which invokes some system commands# to illustrate how to construct a Bash script)## Notes:# 1) The environment variable TEST_VAR must be set# (...
case"$VAR"inpattern_1)# commands when $VAR matches pattern 1;; pattern_2)# commands when $VAR matches pattern 2;; *)# This will run if $VAR doesnt match any of the given patterns;;esac 例子: read-p “Enter the answerinY/N: ” ANSWERcase“$ANSWER”in[yY] | [yY][eE][sS])ec...
You can run the following commands to check information about your shell environment. To check the list of installed shells in your operating system run the following command. The list of installed shells may vary according to your operating system. $cat /etc/shells# /etc/shells: valid login ...
If you’re usingnanoor another shell-based text editor you should perhaps open up two terminals, one where you can edit and save the programs you’re working on, and one where you can run your programs. One advantage of using Atom is that you can keep Atom open in a separate window a...
If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and, if no file is found, then the shell searches the directories in PATH for the script. INVOCATION A login shell is one whose first character of argument zero is ...
One of the powerful aspects of Bash is its ability to use shell scripting. Shell scripts are files containing command sequences that you’d normally run in your command line. Instead of entering commands one by one, you can write a script and execute a series of commands all at once. ...
Read one line from STDIN and assigns it to a variable. popd Removes entries from the directory stack. pushd Add a directory to the directory stack. printf Displays text in a formatted string. source Read and executes commands from a specified file in the current shell. times Displays the acc...
Two invalid commands are used in the following script. So, two errors are generated. The script stops the execution after executing the first invalid command using the “set –e” command.#!/bin/bash #Set the option to terminate the script on the first error set -e echo 'Current date ...
we’ve explored how to change command-line arguments in Bash via thesetcommand and using variables within a script. By understanding the concepts of positional parameters, the argument array, and string manipulation capabilities, we can effectively adapt the behavior of scripts and commands to suit...
Once you have created one, there are two ways to run it. One, which we have already covered, is to type source scriptname. This causes the commands in the script to be read and run as if you typed them in. The second way to run a script is simply to type its name and hit ...