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<p><img src="cover_sed.png" alt=""></p>
<h1 id="introduction">Introduction</h1>
<p>Shell 에서 제일 중요하고 기본이 되는 명령이 sed 입니다.
왜냐하면 모든 명령의 텍스트 출력을 sed 를 이용해 컨트롤할 수 있기 때문입니다.
Unix 운영체제가 처음 만들어졌을 때 3 가지 주요 구성요소가 assembler, editor, shell 이였는데요.
당시에는 컴퓨터가 메모리도 적고, 모뎀 속도도 느리고, 콘솔로 teletype 같은
<a href="https://youtu.be/2XLZ4Z8LpEE?t=621" target="_blank">라인 프린터</a>를 사용했기 때문에 라인 에디터를 사용하였습니다.
현재 리눅스에서도 볼수있는 <code>/bin/ed</code> 명령이 라인 에디터인데요.
이 라인 에디터가 이후에 <code>sed</code>, <code>ex</code>, <code>vi</code>, <code>grep</code> 같은 명령들의 기반이 됩니다.
sed 는 ed 명령의 stream 버전으로 대부분 명령과 사용방법이 같습니다.</p>
<blockquote>
<p>ex 명령은 ed 명령의 확장 버전으로 vi 에서 <code>:</code> 를 이용한 command mode 로 사용됩니다.<br>실제적으로 ex 명령의 visual mode 버전이 vi 입니다.</p>
</blockquote>
<pre><code>필요에 따라 수시로 업데이트 되므로 파일을 다운로드하는 것보다는 웹에서 보는 것이 좋습니다.
흰색 바탕이 너무 밝을 경우 좌측 상단에 보면 어두운 바탕으로 테마를 변경할 수 있습니다.
( 참고로 페이지는 Night 모드에서 작성하였습니다. )
</code></pre>
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