擅长:python、mysql、java
<p>如果要查找第一列为0或1的记录:</p>
<p>首先是一些测试材料:</p>
<pre><code>$ cat file
0 yes sir
1 yes sir
10 nope
01 nope
00 nope
</code></pre>
<p>在awk中:</p>
<pre><code>$ awk '$1 == "1" || $1 == "0"' file
0 yes sir
1 yes sir
</code></pre>
<p>这些将失败:</p>
<pre><code>$ awk '$1 == 0' file
0 yes sir
00 nope
$ awk '$1 == 1' file
1 yes sir
01 nope
</code></pre>