https://blogs.timerring.com/tags/shell/Recent content in Shell on timerringHugoenMon, 25 Jul 2022 20:00:00 +0800https://blogs.timerring.com/posts/shell-scripting-fundamentals/Mon, 25 Jul 2022 20:00:00 +0800https://blogs.timerring.com/posts/shell-scripting-fundamentals/<p>Shell is the language we use to communicate with the operating system through the command line.</p> <p>Shell scripts can run directly on the command line, or a set of logic can be organized into a file for reuse. The command line can be thought of as a “shell script executing line by line.”</p> <p>There are many common kinds of shell scripts in Linux, including:</p> <ul> <li>Bourne Shell (<code>/usr/bin/sh</code> or <code>/bin/sh</code>)</li> <li>Bourne Again Shell (<code>/bin/bash</code>)</li> <li>C Shell (<code>/usr/bin/csh</code>)</li> <li>K Shell (<code>/usr/bin/ksh</code>)</li> <li><code>zsh</code></li> <li>…</li> </ul> <p>Linux systems generally use <code>bash</code> by default.</p> <p>The file should begin with <code>#! /bin/bash</code> to specify <code>bash</code> as the script interpreter.</p>