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显示文件 /var/log/syslog 中最后十行的命令是什么

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显示文件 /var/log/syslog 中最后十行的命令是什么

我想知道显示文件最后十行的命令是什么：/var/log/syslog

答案1

尝试

tail /var/log/syslog

例子：

$ tail /var/log/syslog
Mar 21 11:41:32  whoopsie[1194]: last message repeated 15 times
Mar 21 11:42:32  whoopsie[1194]: last message repeated 20 times
Mar 21 11:43:32  whoopsie[1194]: last message repeated 16 times
Mar 21 11:44:32  whoopsie[1194]: last message repeated 14 times
Mar 21 11:45:32  whoopsie[1194]: last message repeated 11 times
Mar 21 11:46:32  whoopsie[1194]: last message repeated 16 times
Mar 21 11:47:32  whoopsie[1194]: last message repeated 15 times
Mar 21 11:48:32  whoopsie[1194]: last message repeated 14 times
Mar 21 11:49:32  whoopsie[1194]: last message repeated 16 times
Mar 21 11:50:32  whoopsie[1194]: last message repeated 22 times

默认情况下，tail显示输入文件的最后 10 行。要显示更多内容，有一个选项-n。
来自man tail：

-n, --lines=K
       output the last K lines, instead of the last 10; or use -n +K to
       output lines starting with the Kth

例如：

$ tail -n 15 /var/log/syslog
Mar 21 11:56:45 Karimov-Danil named[1122]: error (network unreachable) resolving './DNSKEY/IN': 2001:dc3::35#53
Mar 21 11:56:45 Karimov-Danil named[1122]: error (network unreachable) resolving './NS/IN': 2001:dc3::35#53
Mar 21 11:56:48 Karimov-Danil named[1122]: managed-keys-zone: Unable to fetch DNSKEY set '.': timed out
Mar 21 11:56:51 Karimov-Danil whoopsie[1194]: online
Mar 21 11:57:54  whoopsie[1194]: last message repeated 17 times
Mar 21 11:58:58  whoopsie[1194]: last message repeated 16 times
Mar 21 12:00:03  whoopsie[1194]: last message repeated 10 times
Mar 21 12:01:03  whoopsie[1194]: last message repeated 16 times
Mar 21 12:02:03  whoopsie[1194]: last message repeated 10 times
Mar 21 12:03:03  whoopsie[1194]: last message repeated 17 times
Mar 21 12:04:03  whoopsie[1194]: last message repeated 14 times
Mar 21 12:05:03  whoopsie[1194]: last message repeated 17 times
Mar 21 12:06:03  whoopsie[1194]: last message repeated 13 times
Mar 21 12:07:04  whoopsie[1194]: last message repeated 16 times
Mar 21 12:08:04  whoopsie[1194]: last message repeated 16 times

答案2

tail是可行的方法，但是如果出于某种原因你没有tail，你可以使用tac+awk

tac input.txt | awk 'NR <=10'

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