[Linux common commands Use the cut command

cut - remove sections from each line of files

parameter:

• -b bytes can be used to view the contents of the file
  • -b parameters in Chinese, prone to garbled. Because the Chinese character by character occupies two bytes.
  • 

     1 [root@oldboy oldboy]# head -n 10 /etc/passwd >test.txt
     2 [root@oldboy oldboy]# cat test.txt
     3 root:x:0:0:root:/root:/bin/bash
     4 bin:x:1:1:bin:/bin:/sbin/nologin
     5 daemon:x:2:2:daemon:/sbin:/sbin/nologin
     6 adm:x:3:4:adm:/var/adm:/sbin/nologin
     7 lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin
     8 sync:x:5:0:sync:/sbin:/bin/sync
     9 shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
    10 halt:x:7:0:halt:/sbin:/sbin/halt
    11 mail:x:8:12:mail:/var/spool/mail:/sbin/nologin
    12 uucp:x:10:14:uucp:/var/spool/uucp:/sbin/nologin

    Sample files

     

  • 

    1  # columns for the first 1 
    2 [the root @ Oldboy Oldboy] # Cut 1 -b test.txt 
    . 3  R & lt
     . 4  B
     . 5  D
     . 6  A
     . 7  L
     . 8  S
     . 9  S
     10  H
     . 11  m
     12 is  U
     13 is  
    14  # take 1-3 column 
    15 [Oldboy Oldboy the root @] # Cut 1-3 -b test.txt 
    16  Roo
     . 17  bin
     18 is  DAE
     . 19  ADM
     20 is  LP:
     21 is  SYN
     22 is  Shu
     23 is  HAL
    24  Mai
     25  UUC
     26 is [the root @ Oldboy Oldboy] # Cut -b -3 test.txt 
    27  Roo
     28  bin
     29  DAE
     30  ADM
     31 is  LP:
     32  SYN
     33 is  Shu
     34 is  HAL
     35  Mai
     36  UUC
     37 [  
    38 is  # take 1,3,5 , 9, scramble, but the overall result was output, from small to large display 
    39 [the root @ Oldboy Oldboy] # Cut -b 9,5,3,1 test.txt 
    40 RO ::
     41 is  bnx1
     42 is  Deo:
     43 is  AMX4
     44 L :: :
    45 Sn ::
     46 is  Sud:
     47 HL ::
     48 mi The ::
     49 UC: 0
     50  
    51 is  # display 20 from the last one 
    52 is [the root @ Oldboy Oldboy] # Cut -b 20-1200 test.txt             
    53 is OT: / bin / the bash
     54 is / sbin / nologin
     55 : / sbin: / sbin / nologin
     56 is ADM: / sbin / nologin
     57 is OOL / LPD: / sbin / nologin
     58  in : / bin / Sync
     59 Down: / sbin: / sbin / the shutdown
     60  in : / sbin / the HALT
    61 ar/spool/mail:/sbin/nologin
    62 var/spool/uucp:/sbin/nologin

    cut -b bytes disaggregated by

     

• -c extracted by character, used for Chinese. In English with not much difference with the -b

• -d separator disposed
• -f according field selection, set the number of columns need to look
  • -d and -f parameters to be used in combination
  • The default is a tab cut as the separator
  • 

    1  # the ":" as the delimiter, select the first six fields 
    2 [the root @ Oldboy Oldboy] # Cut -d: -f test.txt. 6 
    . 3 / the root
     . 4 / bin
     . 5 / sbin
     . 6 / var / ADM
     . 7 / var / spool / LPD
     . 8 / sbin
     . 9 / sbin
     10 / sbin
     . 11 / var / spool / mail
     12 is / var / spool / UUCP

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