怎么高效率实用linux：[2]快速修改文本

1、首先准备一个文本

example.txt

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AcetaminophenDB00316TYLProstaglandin G/H synthase 2P35354AcetazolamideDB00819AZMCarbonic anhydrase 1P00915AcetazolamideDB00819AZMCarbonic anhydrase 2P00918AcetazolamideDB00819AZMCarbonic anhydrase 4P22748AcetazolamideDB00819AZMCarbonic anhydrase 3P07451AcetazolamideDB00819AZMCarbonic anhydrase 7P43166AcetazolamideDB00819AZMCarbonic anhydrase 14Q9ULX7Acetohydroxamic AcidDB00551HAEUrease alpha subunitP18314Acetylsalicylic acidDB00945AINProstaglandin G/H synthase 1P23219Acetylsalicylic acidDB00945AINProstaglandin G/H synthase 2P35354AcyclovirDB00787AC2DNA polymeraseP04293AcyclovirDB00787AC2DNA polymeraseP09252AcyclovirDB00787AC2Thymidine kinaseP03176AdenosineDB00640ADNAdenosine A1 receptorP30542AdenosineDB00640ADNAdenosine A2b receptorP29275AdenosineDB00640ADNAdenosine A3 receptorP33765AdenosineDB00640ADNAdenosine A2a receptorP29274

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2、第一个字段是药物名称，中间可能有空格，字段之间是tab键，我们想把第一列取出来

awk -F'\t' '{print $1}' example.txt

3、我们想看看一共有哪几种药物

awk -F'\t' '{print $1}' example.txt|sort|uniq 

4、我们想看看每种药物出现了几次

awk -F'\t' '{print $1}' example.txt|sort|uniq 

5、我们想把文本中小写的acid换成大写的acid

 sed 's/acid/Acid/' example.txt