1.cat：从文件上到下查看文件内容的命令

[root@localhost ~]# cd Desktop/
[root@localhost Desktop]# ls
xxx.txt
[root@localhost Desktop]# cat xxx.txt
1.shdadjaksdj
2.bbbbbbbbbbb
3.wewqhwiehqi
gggggggggggggggg
hhhhhhhhhhhhhh
zzzzzzzzzzzz

2.tac：从文件下到上查看文件内容的命令

[root@localhost Desktop]# tac xxx.txt
zzzzzzzzzzzz
hhhhhhhhhhhhhh
gggggggggggggggg
3.wewqhwiehqi
2.bbbbbbbbbbb
1.shdadjaksdj

3.head：查看文件当中的前10行内容，默认是10行，可以通过-<数字>表示查看多少行内容

[root@localhost Desktop]# head xxx.txt
1.shdadjaksdj
2.bbbbbbbbbbb
3.wewqhwiehqi
gggggggggggggggg
hhhhhhhhhhhhhh
zzzzzzzzzzzz
hhhhhhhhhhhhhhhhhhh
yyyyyyyyyyyyyyyyyyyyyy
ffffffffffffffffffffff
ttttttttttttttttttttt

4.tail -n：（从未行开始查看）查看文件当中的n行数据，默认也是前10行

[root@localhost Desktop]# tail xxx.txt
vvvvvvvvvvv
dddddddddddddddd
ccccccccccccccccc
aaaaaaaaaaaaaaa
qqqqqqqqqqqqqqqqqqqqqqqq
nmmmmmmmmmmmmmmmmmm
nnnnnnnnnnnnnnn
oooooooooooooooo
pppppppppppppppppppppp
wwwwwwwwwwwwwwwww
[root@localhost Desktop]# tail -4 xxx.txt
nnnnnnnnnnnnnnn
oooooooooooooooo
pppppppppppppppppppppp
wwwwwwwwwwwwwwwww

5.wc：统计文件当中的文件的字数

[root@localhost Desktop]# wc xxx.txt22  22 389 xxx.txt

6.nl：代行号显示所有的内容

[root@localhost Desktop]# nl xxx.txt1  1.shdadjaksdj2  2.bbbbbbbbbbb3  3.wewqhwiehqi4  gggggggggggggggg5  hhhhhhhhhhhhhh6  zzzzzzzzzzzz7  hhhhhhhhhhhhhhhhhhh8  yyyyyyyyyyyyyyyyyyyyyy9  ffffffffffffffffffffff10  ttttttttttttttttttttt11  iiiiiiiiiiiiiiiii12  ddddddddddddd13  vvvvvvvvvvv14  dddddddddddddddd15  ccccccccccccccccc16  aaaaaaaaaaaaaaa17  qqqqqqqqqqqqqqqqqqqqqqqq18  nmmmmmmmmmmmmmmmmmm19  nnnnnnnnnnnnnnn20  oooooooooooooooo21  pppppppppppppppppppppp22  wwwwwwwwwwwwwwwww

7.more：用来显示一屏的文件内容，按空格进行翻一屏，查看完自动退出

[root@localhost Desktop]# more xxx.txt
1.shdadjaksdj
2.bbbbbbbbbbb
3.wewqhwiehqi
gggggggggggggggg
hhhhhhhhhhhhhh
zzzzzzzzzzzz
hhhhhhhhhhhhhhhhhhh
yyyyyyyyyyyyyyyyyyyyyy
ffffffffffffffffffffff
ttttttttttttttttttttt
iiiiiiiiiiiiiiiii
ddddddddddddd
vvvvvvvvvvv
dddddddddddddddd
ccccccccccccccccc
aaaaaaaaaaaaaaa
qqqqqqqqqqqqqqqqqqqqqqqq
nmmmmmmmmmmmmmmmmmm
nnnnnnnnnnnnnnn
oooooooooooooooo
pppppppppppppppppppppp
--more--（95%）

8.less：用来显示一屏，查看完毕不会自动退出，按q退出

1.shdadjaksdj
2.bbbbbbbbbbb
3.wewqhwiehqi
gggggggggggggggg
hhhhhhhhhhhhhh
zzzzzzzzzzzz
hhhhhhhhhhhhhhhhhhh
yyyyyyyyyyyyyyyyyyyyyy
ffffffffffffffffffffff
ttttttttttttttttttttt
iiiiiiiiiiiiiiiii
ddddddddddddd
vvvvvvvvvvv
dddddddddddddddd
ccccccccccccccccc
aaaaaaaaaaaaaaa
qqqqqqqqqqqqqqqqqqqqqqqq
nmmmmmmmmmmmmmmmmmm
nnnnnnnnnnnnnnn
oooooooooooooooo
pppppppppppppppppppppp
xxx.txt

查看完之后按q退出

[root@localhost Desktop]# less xxx.txt
[root@localhost Desktop]#

这篇到此结束，感谢关注不迷路!!!