Shell special symbol, Wc,uniq,tee_tr_split command

[[email protected] ~]# cut-d:-F 3/etc/passwd-d: delimiter-F plus number paragraph F is the first paragraph

0

1

2

[[email protected] ~]# cut-d:-F 3,4,5,6,7/etc/passwd can choose a few more paragraphs plus, you can

0:0:root:/root:/bin/bash

1:1:bin:/bin:/sbin/nologin

2:2:daemon:/sbin:/sbin/nologin

3:4:adm:/var/adm:/sbin/nologin

[[email protected] ~]# cut-c 10/etc/passwd-c is the first character C10 is the tenth character

0

:

2

[[email protected] ~]# cut-c 1-10/ETC/PASSWD first to tenth characters-C is the interval number

root:x:0:0

Bin:x:1:1:

Daemon:x:2

[[email protected] ~]# sort/etc/passwd default sort asma sort

aDm:x:3:4:adm:/var/adm:/sbin/nologin

aPache:x:48:48:apache:/var/www:/sbin/nologin

bIn:x:1:1:bin:/bin:/sbin/nologin

DAemon:x:2:2:daemon:/sbin:/sbin/nologin

[[email protected] ~]# sort-t:-k3/etc/passwd-t: Is the delimiter-K3 is the third paragraph sort

Root:x:0:0:root:/root:/bin/bash

Uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin

Operator:x:11:0:operator:/root:/sbin/nologin

Bin:x:1:1:bin:/bin:/sbin/nologin

[[email protected] ~]# sort-t:-k3-n/etc/passwd-n Sort by number can also-K 3,6 interval value

Root:x:0: 0:root:/root:/bin/bash

Bin:x:1: 1:bin:/bin:/sbin/nologin

Daemon:x:2: 2:daemon:/sbin:/sbin/nologin

ADM:X:3: 4:adm:/var/adm:/sbin/nologin

[Email protected] ~]# sort-t:-k3,5-n-r/etc/passwd-r is reverse order

Yun:x:500:500::/home/yun:/bin/bash

SASLAUTH:X:499:76:SASLAUTHD User:/var/empty/saslauth

Bin:x:1:1:bin:/bin:/sbin/nologin

Root:x:0:0:root:/root:/bin/bash

[Email protected] ~]# sort-t:-K 3,5-n-r-u/etc/passwd-u is to repeat the meaning

Sort-un 2.txt can also be used this way

[[email protected] ~]# uniq-c 2.txt plus option-C list Duplicates

1 1

1 2

1 3

2 4

1 5

2 6

1 7

2 8

2 9

[[email protected] ~]# sort 2.txt |uniq-c order in go to repeat

1 1

1 10

1 12

1 1212

1 12166

1 2

1 3

2 4

1 5

2 6

1 7

2 8

2 9

[[email protected] ~]# echo "1111111" |tee 1.txt Tee Usage

1111111

[Email protected] ~]# echo "1111111" |tee 1.txt

1111111

[email protected] ~]# cat 1.txt

1111111

[[email protected] ~]# ls *.txt |tr ' A-Z ' A-z '. txt becomes the capital letter name into the uppercase TR replacement character

1.TXT

2.TXT

C.TXT

M.TXT

Z.TXT

[[email protected] ~]# echo $ "JKSADHASJKDH" |tr ' j ' E ' replace uppercase and lowercase characters

$ eksadhasekdh

[[email protected] ~]# echo "JKSADHASJKDH" |tr ' j ' E '

Eksadhasekdh

[[email protected] ~]# echo "JKSADHASJKDH" |tr ' A-Z ' A-z ' global replacement can also be reduced to a range of ' a-f '

Jksadhasjkdh

Split-Cut Log

[[email protected] ~]# Split-l How many lines of anaconda-ks.cfg-l

[[email protected] ~]# ls

C.txt link xaa xab

12.tar install.log m.txt xac

1.txt install.log.syslog wps xad

[[email protected] ~]# DU-SB anaconda-ks.cfg View Size

1028 Anaconda-ks.cfg

[[email protected] ~]# split-b anaconda-ks.cfg-b 100b cut

[Email protected] ~]# LS-LH xa*

-rw-r--r--1 root root 100 October 07:53 Xaa

-rw-r--r--1 root root 100 October 07:53 Xab

-rw-r--r--1 root root 100 October 07:53 xac

-rw-r--r--1 root root 100 October 07:53 xad

-rw-r--r--1 root root 100 October 07:53 xae

-rw-r--r--1 root root 100 October 07:53 Xaf

-rw-r--r--1 root root 100 October 07:53 xag

-rw-r--r--1 root root 100 October 07:53 Xah

-rw-r--r--1 root root 100 October 07:53 Xai

-rw-r--r--1 root root 100 October 07:53 Xaj

-rw-r--r--1 root root 28 October 07:53 Xak

[[email protected] ~]# split-b anaconda-ks.cfg new_ change name New

[[email protected] ~]# ls

Link New_ai xaf

12.tar m.txt New_aj Xag

1.txt New_aa New_ak Xah

2.txt New_ab wps Xai

Anaconda-ks.cfg New_ac Wps.zip Xaj

&& and | | Or

[[email protected] ~]# ls 1.txt && ls 2.txt capable of executing the first before executing the second

1.txt

2.txt

[[email protected] ~]# ls 1.txt && ls 20.txt previous command execution will execute subsequent command

1.txt

LS: Unable to access 20.txt: No file or directory

[[email protected] ~]# ls 10.txt && ls 2.txt If the previous command did not execute successfully it no longer executes the following command

LS: Unable to access 10.txt: No file or directory

[[email protected] ~]# ls 1.txt | | LS 2.txt

1.txt

[[email protected] ~]# ls 10.txt | | LS 20.txt

LS: Unable to access 10.txt: No file or directory

LS: Unable to access 20.txt: No file or directory

[[email protected] ~]# ls 10.txt | | LS 2.txt

LS: Unable to access 10.txt: No file or directory

2.txt

&& the command on the left executes successfully before executing the command on the right

|| The command on the left is unsuccessful to execute the command on the right.

; If the command on the left succeeds or not, the command will execute

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Shell special symbol, Wc,uniq,tee_tr_split command