Linux5.4 Shell special symbols and piping related commands

Special Compliance

        1. * Any of the characters 2. ? Any one character 3. # comment Character 4. \  de-semantic character 5. |  Pipe character 6. The $ variable prefix, which represents the row bit 7. ; Multi-line command line input, split with 8. ~ User home directory, regular indicates match 9. & After the command is placed, the command will be dropped to the background.  >  >>   2>  2>>   &>11. [] One of the specified characters, [0-9][a-za-z][abc]12. ||   &&            | | In the shell is or means, the first one is not successful execution of the second, success is not executed in the second article              && the  first successful execution of the second article        

Cut intercept Segmentation

#-D delimiter  #-F Specify segment number #-C to specify the characters, use-C do not use-d-f[[email protected] tmp]# head-2 passwd.txt |cut-d ': '-f 2,4,7x:0:/bin/ba Shx:1:/sbin/nologin[[email protected] tmp]# head-2 passwd.txt |cut-c  2,4,7ot:i:1

Sort sorts

#sort常与uniq "To repeat" together with #-n  to sort by numbers, letters or special symbols think 0#-r   #-t   delimiter, for the first paragraph sort, with-K  -kn1,n2 "rarely used" [[Email Protected] tmp]# head-4 passwd.txt  |sort-nadm:x:3:4:adm:/var/adm:/sbin/nologinbin:x:1:1:bin:/bin:/sbin/ Nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinroot:x:0:0:root:/root:/bin/bash[[email protected] tmp]# head-4 Passwd.txt  |sort-rroot:x:0:0:root:/root:/bin/bashdaemon:x:2:2:daemon:/sbin:/sbin/nologinbin:x:1:1:bin:/bin :/sbin/nologinadm:x:3:4:adm:/var/adm:/sbin/nologin[[email protected] tmp]# head-4 passwd.txt  |sort-t ': '-k3root : 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/nologin

Number of WC statistics rows

#-l count the number of    rows #-m  Statistical characters, count the number of hidden characters #-w  statistics, divide words with blank characters [[email protected] tmp]# head-4 passwd.txt  |wc-m142[[ Email protected] tmp]# head-4 passwd.txt  |wc-l4[[email protected] tmp]# head-4 passwd.txt  |wc-w4[[email Protec TED]02 tmp]# cat! $cat 234234.txt123asdf werr,asdf[[email protected] tmp]# wc-w! $WC-W 234234.txt3 234234.txt#cat-a View hidden character, where the line break [[email protected] tmp]# cat-a passwd.txt| Head-4root:x:0:0:root:/root:/bin/bash$bin:x:1:1:bin:/bin:/sbin/nologin$daemon:x:2:2:daemon:/sbin:/sbin/nologin $adm: x:3:4:adm:/var/adm:/sbin/nologin$

Uniq to Heavy

# just the same weight as the two lines next to each other, so you need to sort first. #-C    count rows [[email protected] tmp]# cat! $cat 234234.txt123123345456asdfb34502asdf werr,asdf[[email protected] tmp]# Sort!$|uniq-csort 234234.txt|uniq-c      1      2 123      2 345      1 456      1 ASDFB      1 asdf werr,asdf

Tee command

# with output redirection > similar, redirect to the following file while the screen is displayed. #-a   append [[email protected] tmp]# sort 234234.txt|uniq-c| Tee ty.txt      1      2 123      2 345      1 456      1 ASDFB      1 asdf werr,asdf[[email protected] tmp]# cat ty.txt      1      2 123      2 345      1 456      1 ASDFB      1 asdf Werr,asdf

TR Replacement Character

[Email protected] tmp]# echo "Chyuanliulinux" |tr ' l ' l ' chyuanliulinux[[email protected] tmp]# echo "Chyuanliulinux" |tr  ' Li ' L ' chyuanllullnux[[email protected] tmp]# echo "chyuanliulinux" |tr ' li ' li ' chyuanliulinux[[email protected] tmp]# echo "Chyuanliulinux" |tr ' A-Z ' A-Z ' chyuanliulinux

Split cut

#-B Size "default unit Byte" #-L line # If the target file name is not specified, the Xaa   xab ...   Such file names are accessed after the cut files.  You can specify the target file name [[email protected] ty]# du-sh ty.txt244k    ty.txt[[email protected] ty]# split-b 50k ty.txt[[email protected] ty]# lsty.txt  xaa  xab  xac  xad  xae[[email protected] ty]# du-sh x*52k     xaa52k     xab52k     xac52k     xad44k     xae[[email protected] ty]# split-b 50k ty.txt chy[[email protected] ty]# Lschyaa  Chyab  Chyac  chyad  chyae  ty.txt

Linux5.4 Shell special symbols and piping related commands