Use of the cut sort tee and Uniq commands in Linux systems

Use-----split for cut commands

 [[email protected] wang]# cut -d  ': '   The-f 1 passwd1 |head -n3  //cut command is used for cutting. -D followed by    delimited, enclosed in single quotation marks  root                                                              //-F specifies the paragraph. The first segment after the delimiter is split  bindaemon  [[email protected] wang]# cut -c1 passwd1  |HEAD -N 3     //CUT specifies a number after which to intercept the first few characters  rbd  [[email  protected] wang]# cut -c1-5 passwd1 |head -n 3   // The cut is followed by a number field that represents the block from a few to a few characters  root:bin:xdaemo 

Sort command using-----sorting

/* Several options for the sort command:-T delimiter: The function is the same as the-D option after cut-N: Use a pure digital row-r: Reverse Sort-u: to repeat the-KN1.N2: the interval is sorted to the N2 interval, or you can write-kn1, that is, sort N1 fields.

 [[email protected] wang]# head -n5 passwd1 |sort   // If sort does not have any options, sort backwards from the first character, followed by ASCII values, and finally arrange them in ascending order  adm:x:3:4:adm:/var/adm:/sbin/nologinbin:x:1:1:bin:/bin:/ sbin/nologindaemon:x:2:2:daemon:/sbin:/sbin/nologinlp:x:4:7:lp:/var/spool/lpd:/sbin/nologinroot:x:0:0:root:/ Root:/bin/bash[[email protected] wang]# head -n5 passwd1 |sort -t: -k3 After  -n  //-t is the delimiter, the third row is sorted,-n pure digit sort  root: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] wang]#  head -n5 passwd1            //take a look at the first 5 lines of the passwd file  root: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] wang]#  head -n5 passwd1 |sort -n -u   //the first 5 rows with a purely numeric sort &nbsp, and then in the de-duplication    (sort for-n-Purely numeric sort, the system will treat all the letters as 0 root:x:0:0:root:/root:/bin/bash                            //plus A-u to repeat, there will be only one line left

/*uniq is used to repeat the line, the most common option is only one-C: Statistics duplicate rows, and write the number of lines in front */

[[email protected] ~]# VIM test.c//use VIM to open a file, write several numbers 111222333222444333~[[email protected] ~]# uniq test.c//Direct with U Niq command, found that the file did not change 111222333222444333[[email protected] ~]# sort test.c |uniq//First sort, then in Uniq, so use Uniq if you have to sort the files and then repeat      111222333444[[email protected] ~]# sort test.c |uniq-c//Plus-c option, the number of repeated rows is displayed in front of that line 1 111 2 222 2 333 1 444

The tee command, followed by the filename/* is similar to redirection ">", but the specific weighting is a feature that is also displayed on the screen while the file is written to the back of the file */

[[email protected] ~]# echo  "aaaaaaaaaa"  >test.c  //Redirect to test.c file  [ [email protected] ~]# cat test.c       //displays information after redirection        aaaaaaaaaa    [[email protected] ~]#  echo  "BBBBBBBB"  |tee test.c   //tee the result of the operation, the content to be written on the screen display     The     BBBBBBBB  TR and split command    /*tr are used to replace characters and are commonly used to handle special characters appearing in documents:-D: Delete a character,- D followed by the character to be deleted   -s: Remove the duplicate characters */    [[email protected] ~]# head -n  2 /root/wang/passwd1 |tr  ' [A-z] '   ' [A-z] '   //replace the first two lines of the file with uppercase letters         root:x:0:0:root:/root:/bin/bash      bin:x:1:1:bin :/bin:/sbin/nologin    [[email protected] ~]# head -n 2 / Root/wang/passwd1 |tr  ' A '   ' a '         //convert lowercase A in file to uppercase ' a '           root:x:0:0:root:/root:/bin/bAsh         bin:x:1:1:bin:/bin:/sbin/nologin     split for cutting documents    //         [[email protected] wang]# ls           passwd1 [[email protected] wang]# split -b  500 /root/wang/passwd1   //cutting Documents,-B option to cut documents by size in byte  [[email protected]  wang]# ls     //If split does not specify a target file name, it will be xaa xab ... Such filenames to access the cut file          passwd1  xaa  xab   xac     [[email protected] wang]# split -b 500  /root/wang/passwd1 123  //Specify the file name       [[email protected] wang]# ls      123aa  123ab  123ac  passwd1  xaa  xab  xac      [[email protected] wang]# wc -l passwd1  // See how many lines a document has in common         29 passwd1        [[email protected] wang]# split -l 10 passwd1    //- L represents the number of rows to be cut by the document       [[email protected] wang]# wc -l *        //  View post-cut documents        29  passwd1      10 xaa      10 xab  Total amount of      9 xac      58 

Use of the cut sort tee and Uniq commands in Linux systems