首页 / 操作系统 / Linux / Linux文本查看命令(cat,tac,rev,head,tail,more,less) 详解
Linux中我们总会有查看文本某些内容的时候,如果我们仅因为查看文本就使用vi进去文件又增加了不少额外的操作不方便。下面介绍一些文本查看命令,大家看后应该会有所帮助-------------------------------------------------------------------------------- catcat - concatenate files and print on the standard output 表达格式:cat [OPTION]... [FILE]... 常用选项: -A:显示所有控制符 -n:显示行数 -E:显示行结束符下面以几个例子来具体说明cat及其选项的使用 实验目录/test 文本/test/cat1 /test/cat2 1234567891011121314 [root@localhost test]# ll /test/ 总用量 8 -rw-r--r--. 1 root root 43 8月 7 16:46 cat1 -rw-r--r--. 1 root root 19 8月 7 16:46 cat2 [root@localhost test]# cat cat1 hi,everyone now I will show how to use cat [root@localhost test]# cat -An cat1 1 hi,everyone$ 2 now I will show how to use cat$ [root@localhost test]# cat -nE cat1 cat2 1 hi,everyone$ 2 now I will show how to use cat$ 3 This is an example$cat后面可以接多个文件,常用选项可以组合使用-------------------------------------------------------------------------------- tac cat的反向显示,按文本反向tac - concatenate and print files in reverse tac [OPTION]... [FILE]... [root@localhost test]# tac cat1 now I will show how to use cat hi,everyonetac选项都不常用,因此不予介绍-------------------------------------------------------------------------------- rev 文件内容按行反向显示rev - reverse lines of a file or files rev [options] [file ...] [root@localhost test]# rev cat1 enoyreve,ih tac esu ot woh wohs lliw I wonrev无有价值可介绍选项-------------------------------------------------------------------------------- headhead - output the first part of files head [OPTION]... [FILE]... 常用选项: -c #:显示前多少个字节 -n #:显示前多少行,n可以省去 head file 默认显示文件前十行内容 [root@localhost test]# head -3 head 12345 67890 12 [root@localhost test]# head -c 3 head [root@localhost test]#-------------------------------------------------------------------------------- tailtail - output the last part of files tail [OPTION]... [FILE]... 常用选项: -c #:显示后多少个字节 -n #:显示后多少行,n可以省去 -f :跟踪显示文件新追加的内容,常用日志监控 123456789101112 [root@localhost test]# tail -3 head 345 123 6 [root@localhost test]# tail -c 5 head 23 6 [root@localhost test]# tail -f /var/log/messages Aug 7 17:15:04 localhost dhclient[9668]: DHCPDISCOVER on eno16777728 to 255.255.255.255 port 67 interval 11 (xid=0x7773726a) Aug 7 17:15:05 localhost NetworkManager[916]: <warn> (eno16777728): DHCPv4 request timed out. Aug 7 17:15:05 localhost NetworkManager[916]: <info> (eno16777728): DHCPv4 state changed unknown -> timeout ...-------------------------------------------------------------------------------- more 特点:翻屏至文件尾部后自动退出more - file perusal filter for crt viewing 表达格式:more [options] file [...] [root@localhost ~]# man /etc/init.d/functions ... ;; stop) s=$"Stopping $prog (via systemctl): " ;; reload|try‐ reload) s=$"Reloading $prog configuration (via systemctl): " ;; restart|try‐restart|con‐ drestart) s=$"Restarting $prog (via systemctl): " ;; esac Manual page functions line 1 (press h for help or q to quit)-------------------------------------------------------------------------------- lessless - opposite of more 在less中可以使用之前在man里面的搜索功能,可以简单的认为less是more的加强版。less翻屏至文件尾部后不自动退出。本文永久更新链接地址