Merge branch 'master' of https://github.com/CyC2018/Interview-Notebook
@ -1078,7 +1078,7 @@ dmtsai pts/0 192.168.1.100 Thu Jul 9 17:23 - 23:36 (06:12)
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dmtsai pts/0 192.168.1.100 Thu Jul 9 08:02 - 08:17 (00:14)
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dmtsai tty1 Fri May 29 11:55 - 12:11 (00:15)
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$ last -n 5 | awk '{print $1 "\t" $3}
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$ last -n 5 | awk '{print $1 "\t" $3}'
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```
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可以根据字段的某些条件进行匹配,例如匹配字段小于某个值的那一行数据。
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