cat：連接并顯示文件

NAME
?????? cat - concatenate files and print on the standard output

[root@localhost ~]# cat /etc/issue
Red Hat Enterprise? Server release 6.6 (Santiago)
\m

[root@localhost ~]# cat /etc/fstab

#
# /etc/fstab
# Created by anaconda on Sun Jun 21 02:15:00 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=57d85756-7680-4c7c-9125-6ad67dae2c45 /?????????????????????? ext4??? defaults??????? 1 1
UUID=2622a4b4-ddc9-47a3-aa2b-f06bc9bec085 /boot?????????????????? ext4??? defaults??????? 1 2
UUID=33d94759-fa01-4c4f-b4ac-bf3a1fe5e84f swap??????????????????? swap??? defaults??????? 0 0
tmpfs?????????????????? /dev/shm??????????????? tmpfs?? defaults??????? 0 0
devpts????????????????? /dev/pts??????????????? devpts? gid=5,mode=620? 0 0
sysfs?????????????????? /sys??????????????????? sysfs?? defaults??????? 0 0
proc??????????????????? /proc?????????????????? proc??? defaults??????? 0 0
[root@localhost ~]# cat /etc/issue /etc/fstab
Red Hat Enterprise? Server release 6.6 (Santiago)
\m

#
# /etc/fstab
# Created by anaconda on Sun Jun 21 02:15:00 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=57d85756-7680-4c7c-9125-6ad67dae2c45 /?????????????????????? ext4??? defaults??????? 1 1
UUID=2622a4b4-ddc9-47a3-aa2b-f06bc9bec085 /boot?????????????????? ext4??? defaults??????? 1 2
UUID=33d94759-fa01-4c4f-b4ac-bf3a1fe5e84f swap??????????????????? swap??? defaults??????? 0 0
tmpfs?????????????????? /dev/shm??????????????? tmpfs?? defaults??????? 0 0
devpts????????????????? /dev/pts??????????????? devpts? gid=5,mode=620? 0 0
sysfs?????????????????? /sys??????????????????? sysfs?? defaults??????? 0 0
proc??????????????????? /proc?????????????????? proc??? defaults??????? 0 0
[root@localhost ~]#

-n, --number（顯示行號）
????????????? number all output lines

[root@localhost ~]# cat -n /etc/issue
???? 1?Red Hat Enterprise? Server release 6.6 (Santiago)
???? 2?\m
???? 3?

-E, --show-ends（顯示結束符號$，windows結束符為$+回車）
????????????? display $ at end of each line

[root@localhost ~]# cat -E /etc/issue
Red Hat Enterprise? Server release 6.6 (Santiago)$
\m$
$

---

tac：倒敘顯示文本

NAME
?????? tac - concatenate and print files in reverse

[root@localhost ~]# cat /etc/issue
Red Hat Enterprise? Server release 6.6 (Santiago)
\m

[root@localhost ~]# tac /etc/issue

\m
Red Hat Enterprise? Server release 6.6 (Santiago)

---

more、less：分屏查看

more支持向后翻屏，翻到文章尾部后退出

less不會退出

---

head：輸出文件首部

NAME
?????? head - output the first part of files

[root@localhost ~]# head /etc/inittab
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#

---

tail：輸出文件尾部

NAME
?????? tail - output the last part of files

[root@localhost ~]# tail /etc/inittab
# Default runlevel. The runlevels used are:
#?? 0 - halt (Do NOT set initdefault to this)
#?? 1 - Single user mode
#?? 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
#?? 3 - Full multiuser mode
#?? 4 - unused
#?? 5 - X11
#?? 6 - reboot (Do NOT set initdefault to this)
#
id:5:initdefault:
[root@localhost ~]#

-f, --follow[={name|descriptor}] （查看文件尾部后續追加內容）

????????????? output appended data as the file? grows;? -f,? --follow,? and? --follow=descriptor? are
????????????? equivalent

轉載于:https://blog.51cto.com/f1yinsky/1897101

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