擅长:python、mysql、java
<pre><code>$ awk 'BEGIN{FS=OFS=" "} {gsub(/ /,0,$2)} 1' file
ME45 P 131104113001.253
ME39 P 131104113007.700
ME38 P 131104113007.776
ME37 P 131104113008.285
ME36 P 131104113008.689
ME30 P 131104113010.252
ME26 P 131104113010.486
ME29 P 131104113009.598
ME28 P 131104113009.356
ME21 P 131104113009.911
ME20 P 131104113010.465
ME17 P 131104113010.984
</code></pre>