/notes/bash/Recent content in Bash Notes on John's BlogHugo -- gohugo.ioen/notes/bash/basic/Mon, 01 Jan 0001 00:00:00 +0000/notes/bash/basic/<!-- Variable --> <div class="note-card "> <div class="item"> <h5 class="note-title"><span>Variable</span></h5> <div class="card"> <div class="card-body"><div class="code-block" data-code-block><div class="code-block-full" id="code-block-6666cd76f96956469e7be39d750cc7d9-0"><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span>NAME<span style="color:#f92672">=</span><span style="color:#e6db74">&#34;John&#34;</span> </span></span><span style="display:flex;"><span>echo $NAME </span></span><span style="display:flex;"><span>echo <span style="color:#e6db74">&#34;</span>$NAME<span style="color:#e6db74">&#34;</span> </span></span><span style="display:flex;"><span>echo <span style="color:#e6db74">&#34;</span><span style="color:#e6db74">${</span>NAME<span style="color:#e6db74">}</span><span style="color:#e6db74"> </span></span></span></code></pre></div></div> <script type="application/json" class="code-block-data">{"copyButton":true,"expanded":false,"labels":{"code":"Code","copied":"Copied!","copy":"Copy","copyError":"Copy failed. Try again.","showAll":"Show all {count} lines","showLess":"Show fewer lines"},"language":"","preview":"","source":"NAME=\"John\"\necho $NAME\necho \"$NAME\"\necho \"${NAME}\n","title":"bash"}</script></div></div> </div> </div> </div> <!-- Condition --> <div class="note-card "> <div class="item"> <h5 class="note-title"><span>Condition</span></h5> <div class="card"> <div class="card-body"><div class="code-block" data-code-block><div class="code-block-full" id="code-block-6666cd76f96956469e7be39d750cc7d9-0"><div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-bash" data-lang="bash"><span style="display:flex;"><span><span style="color:#66d9ef">if</span> <span style="color:#f92672">[[</span> -z <span style="color:#e6db74">&#34;</span>$string<span style="color:#e6db74">&#34;</span> <span style="color:#f92672">]]</span>; <span style="color:#66d9ef">then</span> </span></span><span style="display:flex;"><span> echo <span style="color:#e6db74">&#34;String is empty&#34;</span> </span></span><span style="display:flex;"><span><span style="color:#66d9ef">elif</span> <span style="color:#f92672">[[</span> -n <span style="color:#e6db74">&#34;</span>$string<span style="color:#e6db74">&#34;</span> <span style="color:#f92672">]]</span>; <span style="color:#66d9ef">then</span> </span></span><span style="display:flex;"><span> echo <span style="color:#e6db74">&#34;String is not empty&#34;</span> </span></span><span style="display:flex;"><span><span style="color:#66d9ef">fi</span> </span></span></code></pre></div></div> <script type="application/json" class="code-block-data">{"copyButton":true,"expanded":false,"labels":{"code":"Code","copied":"Copied!","copy":"Copy","copyError":"Copy failed. Try again.","showAll":"Show all {count} lines","showLess":"Show fewer lines"},"language":"","preview":"","source":"if [[ -z \"$string\" ]]; then\n echo \"String is empty\"\nelif [[ -n \"$string\" ]]; then\n echo \"String is not empty\"\nfi\n","title":"bash"}</script></div></div> </div> </div> </div>