用途
tail命令主要用于取出后边几行
全称
tail命令的全称即为tail(尾巴)
参数
-n :后边接数字，代表显示几行的意思
-f :循环读取
-q :不显示处理信息
-v :显示详细的处理信息
案例
案例一：显示文件最后5行内容
[root@bigdata ~]# tail -5 /etc/man_db.conf
# #--------------------------------------------------------- # Flags. # NOCACHE keeps man from creating cat pages. #NOCACHE案例二：循环查看文件内容
[root@bigdata /]# ping localhost >test.txt &
[4] 9944
[root@bigdata /]# tail -f test.txt 64 bytes from localhost (127.0.0.1): icmp_seq=1791 ttl=64 time=0.112 ms 64 bytes from localhost (127.0.0.1): icmp_seq=1792 ttl=64 time=0.161 ms bytes from localhost (127.0.0.1): icmp_seq=1793 ttl=64 time=0.166 ms 64 bytes from localhost (127.0.0.1): icmp_seq=1794 ttl=64 time=0.133 ms….
想要结束按CTRL+C即可
案例三：从第5行开始显示文件
[root@bigdata /]# tail -n +5 /etc/man_db.conf
# their PATH environment variable. For details see the manpath(5) man page. # # Lines beginning with `#' are comments and are ignored. Any combination of # tabs or spaces may be used as `whitespace' separators. # # There are three mappings allowed in this file: # -------------------------------------------------------- # MANDATORY_MANPATH manpath_element # MANPATH_MAP path_element manpath_element # MANDB_MAP global_manpath [relative_catpath] #---------------------------------------------------------……