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<h1 id="and-or-not">AND, OR, NOT</h1>
<p>sed 는 간단히 사칙연산을 할 수 있는 연산자도 없을뿐더러 AND, OR 연산자도 없습니다.<br>하지만 sed 의 기본기능을 활용하면 AND, OR 연산을 처리할 수가 있습니다.</p>
<h2 id="and">AND</h2>
<p>AND 연산은 보통 프로그래밍 언어에서 <code>&&</code> 연산자로 표현되는데요.<br>sed 에서는 다음과 같은 방식으로 AND 연산 결과를 얻을 수 있습니다.</p>
<h5 id="aa--bb">AA && BB</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"AA 11 BB 22 CC"</span> | sed -n <span class="hljs-string">'/AA/{ /BB/p }'</span>
AA <span class="hljs-number">11</span> BB <span class="hljs-number">22</span> CC
</code></pre>
<h5 id="aa--bb--cc">AA && BB && CC</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"AA 11 BB 22 CC"</span> | sed -n <span class="hljs-string">'/AA/{ /BB/{ /CC/p } }'</span>
AA <span class="hljs-number">11</span> BB <span class="hljs-number">22</span> CC
</code></pre>
<h2 id="or">OR</h2>
<p>OR 연산은 프로그래밍 언어에서 <code>||</code> 연산자에 해당하는데요.<br>sed 에서는 regex 에서 제공하는 <code>|</code> 연산자를 이용할 수 있습니다.</p>
<h5 id="aa--bb">AA || BB</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"11 BB 22 CC 33"</span> | sed -En <span class="hljs-string">'/AA|BB/p'</span>
<span class="hljs-number">11</span> BB <span class="hljs-number">22</span> CC <span class="hljs-number">33</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"11 BB 22 CC 33"</span> | sed -En <span class="hljs-operator">-e</span> <span class="hljs-string">'/AA/{bX}; /BB/{bX}; b'</span> <span class="hljs-operator">-e</span> <span class="hljs-string">':X p'</span>
<span class="hljs-number">11</span> BB <span class="hljs-number">22</span> CC <span class="hljs-number">33</span>
</code></pre>
<h5 id="aa--bb--cc">AA || BB || CC</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"11 CC 22 DD 33"</span> | sed -En <span class="hljs-string">'/AA|BB|CC/p'</span>
<span class="hljs-number">11</span> CC <span class="hljs-number">22</span> DD <span class="hljs-number">33</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"11 CC 22 DD 33"</span> | sed -En <span class="hljs-operator">-e</span> <span class="hljs-string">'/AA/{bX}; /BB/{bX}; /CC/{bX}; b'</span> <span class="hljs-operator">-e</span> <span class="hljs-string">':X p'</span>
AA <span class="hljs-number">11</span> BB <span class="hljs-number">22</span> CC
</code></pre>
<h2 id="and-or">AND, OR</h2>
<h5 id="aa---11--22-">AA && ( 11 || 22 )</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"AA 22 BB 33 CC"</span> | sed -En <span class="hljs-string">'/AA/{ /11|22/p }'</span>
AA <span class="hljs-number">22</span> BB <span class="hljs-number">33</span> CC
</code></pre>
<h5 id="aa--bb---11--22--33-">AA && BB && ( 11 || 22 || 33 )</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"AA 33 BB 44 CC"</span> | sed -En <span class="hljs-string">'/AA/{ /BB/{ /11|22|33/p } }'</span>
AA <span class="hljs-number">33</span> BB <span class="hljs-number">44</span> CC
</code></pre>
<h5 id="aa---11--22-">AA || ( 11 && 22 )</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"BB 11 CC 22 DD"</span> | sed -En <span class="hljs-operator">-e</span> <span class="hljs-string">'/AA/{bX}; /11/{ /22/{bX} }; b'</span> <span class="hljs-operator">-e</span> <span class="hljs-string">':X p'</span>
BB <span class="hljs-number">11</span> CC <span class="hljs-number">22</span> DD
</code></pre>
<h5 id="aa--bb---11--22--33-">AA || BB || ( 11 && 22 && 33 )</h5>
<pre><code class="lang-bash">$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"11 CC 22 DD 33"</span> | sed -En <span class="hljs-operator">-e</span> <span class="hljs-string">'/AA|BB/{bX}; /11/{ /22/{ /33/{bX} } }; b'</span> <span class="hljs-operator">-e</span> <span class="hljs-string">':X p'</span>
<span class="hljs-number">11</span> CC <span class="hljs-number">22</span> DD <span class="hljs-number">33</span>
</code></pre>
<h2 id="not">NOT</h2>
<p><code>/.../</code> 뒤에 <code>!</code> 문자를 붙이면 logical NOT 이 됩니다.</p>
<pre><code class="lang-bash"><span class="hljs-comment"># 라인이 foo 로 시작하지 않을 경우 맨앞 또는 맨뒤에 'X' 를 붙인다.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"goobar 111 222"</span> | sed -E <span class="hljs-string">'/^foo/! s/^|$/X/g'</span>
Xgoobar <span class="hljs-number">111</span> <span class="hljs-number">222</span>X
<span class="hljs-comment"># 뒤 이어지는 명령이 두 개 이상일 경우는 다음과 같이 { } 를 사용해야 합니다.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"goobar 111 222"</span> | sed -E <span class="hljs-string">'/^foo/! { s/^|$/X/g; s/111/aaa/ }'</span>
Xgoobar aaa <span class="hljs-number">222</span>X
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">"foobar 111 222"</span> | sed -E <span class="hljs-string">'/^foo/! s/^|$/X/g'</span>
foobar <span class="hljs-number">111</span> <span class="hljs-number">222</span>
<span class="hljs-comment"># 다음식은 모두 동일한 것으로 공백라인 또는 '#' 문자로 시작하지 않을 경우 프린트됩니다.</span>
sed -En <span class="hljs-string">'/^\s*$|^#/!p'</span>
sed -En <span class="hljs-string">'/^\s*$/!{ /^#/!p }'</span>
sed -En <span class="hljs-string">'/^#/!{ /^\s*$/!p }'</span>
</code></pre>
<h3 id="예제-1">예제 1</h3>
<p>데이터 파일 내용 중에서 <code>rocommunity</code> 가 있는 라인을 삭제합니다.<br>그런데 라인이 <code>127.0.0.1</code> 를 포함하고 있으면 삭제하지 않고 프린트합니다.</p>
<pre><code class="lang-bash">$ cat file
rocommunity hedona <span class="hljs-number">127.0</span>.<span class="hljs-number">0.1</span>
rocommunity hedona linux1
rocommunity hedona linux12
rocommunity hedona linux13
rocommunity hedona linux15
rocommunity hedona linux16
rocommunity hedona linux17
syscontact linux <span class="hljs-number">67</span>
syslocation UNKNOWN
trapcommunity hedona
trapsink linux76 parshedona
$ sed <span class="hljs-string">'/rocommunity/{ /127\.0\.0\.1/!d }'</span> file
rocommunity hedona <span class="hljs-number">127.0</span>.<span class="hljs-number">0.1</span>
syscontact linux <span class="hljs-number">67</span>
syslocation UNKNOWN
trapcommunity hedona
trapsink linux76 parshedona
</code></pre>
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