Linux Command cut usage

Linux Command cut usage

Cut command
Cut [OPTION] ... [FILE] ...
-D DELIMITER: Indicates delimiter
-F Fileds:
#: Section # Fields
#,#[,#] Discrete multiple fields, such as 1,3,6
#-#连续的多个字段, e.g. 1-6

Mixed use 1-3,7
--output-delimiter=string

            [[email protected] ~]#  cut -d :  -f 1 /etc/passwd             root            bin             daemon             adm            lp             sync             shutdown             halt            mail             uucp             operator            games             gopher             ftp            nobody             dbus             usbmuxd             vcsa            rtkit             avahi-autoipd             abrt             haldaemon            gdm             ntp            apache             saslauth             postfix             pulse            sshd             tcpdump             hadoop            zhangshan

            

            [[email protected] ~]#  cut -d :  -f 1,3 /etc/passwd             root:0            bin:1             daemon:2             adm:3             lp:4            sync:5             shutdown:6             halt:7             mail:8            uucp:10             operator:11             games:12            gopher:13             ftp:14             nobody:99            dbus :81            usbmuxd:113             vcsa:69             rtkit:499             avahi-autoipd:170            abrt:173             haldaemon:68             gdm:42            ntp:38             apache:48             saslauth:498             postfix:89            pulse:497             sshd:74             tcpdump:72             hadoop:500            zhangshan:501

Usage
-B is split in bytes. These byte locations will ignore multibyte character boundaries unless the-n flag is also specified.
-C is split in characters.
-D Custom delimited defaults think of tabs.
-F is used with-D to specify which area to display.
-N cancels the splitting of multibyte characters.

Detailed explanation later
(1)-B usage
Take the third byte of each row

[[email protected] ~]# whoroot tty2 2016-07-07 06:08root tty1 2016-07-07 06:06 (: 0) Root pts/0 2016-07-07 06:07 (: 0.0) root pts/1 2016-07-07 06:08 (192.168.0.110)

[email protected] ~]# who | Cut-b 3oooo

What do I do if I want to extract the 2nd, 3rd, and 4th bytes of 1th?

[Email protected] ~]# Who|cut-b 1-3,4rootrootrootroot

Take the first 3 bytes with-3

[Email protected] ~]# Who|cut-b -3rooroorooroo

After taking 3 bytes with 3-

[[email protected] ~]# who|cut-b 3-ot tty2 2016-07-07 06:08ot tty1 2016-07-07 06:06 (: 0) OT PT s/0 2016-07-07 06:07 (: 0.0) ot pts/1 2016-07-07 06:08 (192.168.0.110)

(2) The use of-C

Take 1th 2nd, 3rd, and 4th bytes here and-B there's no difference.

[Email protected] ~]# who|cut-c 1-3,4rootrootrootroot

So there is no difference between-B and-C If you extract the Chinese difference will look out to see the situation of Chinese extraction

[[email protected] ~]# cat Sb.txt today is Monday I'm going to work. Today is Tuesday I have to go to work. Today is Wednesday I have to go to work. Today is Thursday I have to go to work. Today is Friday I have to go to work. Today is Saturday I don't have to go to work.

[Email protected] ~]# Cut-b 3 sb.txt

[[email protected] ~]# cut-c 3 sb.txt Yes Yes Yes Yes Yes Yes

You see that? with-C will output normal in characters and-B will only be silly to calculate the output is garbled with byte 8 bit bits.
(3)-N usage
When multiple-byte characters are encountered, you can use the-n option-N to tell the cut not to disassemble multibyte characters. Examples are as follows

The following command has no results

[Email protected] ~]# CUT-NB 2 sb.txt

Or

The following command has no results

[email protected] ~]# Cat Sb.txt | CUT-NB 2

With results

[email protected] ~]# Cat Sb.txt | CUT-NB----------this today

(4) The use of-f
The former five elements of/etc/passwd as an example

[Email protected] ~]# cat/etc/passwd|head-n 5root:x:0:0:root:/root:/bin/bashbin:x:1:1:bin:/bin:/sbin/ nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologinlp:x:4:7:lp:/var/spool/lpd:/ Sbin/nologin[[email protected] ~]# cat/etc/passwd|head-n 5|cut-d:-F 1ROOTBINDAEMONADMLP

You see that? Use-D to set the delimiter as a colon and then use-F to set the first field I want to take.

Another example below

[Email protected] ~]# cat/etc/passwd|head-n 5|cut-d:-F 1-3,7root:x:0:/bin/bashbin:x:1:/sbin/nologindaemon:x:2:/ Sbin/nologinadm:x:3:/sbin/nologinlp:x:4:/sbin/nologin

Take the first 3

[Email protected] ~]# cat/etc/passwd|head-n 5|cut-d:-f-3root:x:0bin:x:1daemon:x:2adm:x:3lp:x:4

(4) Other-custom delimiter-D
If you encounter spaces and tabs, how to distinguish it I feel a bit messy what to do (there is a problem here.) )

[[email protected] ~]# cat Aa.txt A wordthis is a wordthis are a wordthis is a word

[email protected] ~]# cat aa.txt |cut-d "-F 3aaa Worda

Hope that we all point together progress haha.

This article is from the "Liang blog" blog, make sure to keep this source http://7038006.blog.51cto.com/7028006/1812434

Linux Command cut usage