join

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vt.& vi.Join;participate;connect;connect

vt. Participate; combine; get on (train, plane, etc.); get on (road)

n.Connect; combine; join; join point

Third person singular: joins Present participle: joining Past tense : joined past participle: joined

Linux join command syntax

Function: The join command is used to connect lines with the same content in the specified fields in two files.

Syntax: join [-i][-a<1 or 2>][-e<string>][-o<format>][-t<character >][-v<1 or 2>][-1<field>][-2<field>][--help][--version][File1][File2]

Linux join command example

In order to clearly understand the join command, first display the contents of the files testfile_1 and testfile_2 through the cat command.

Then compare the two files in the default way, connect the lines with the same content in the specified fields in the two files, and enter the command in the terminal:

join testfile_1 testfile_2

First check testfile_1 and testfile_2 Contents of the file:

$ cat testfile_1 #testfile_1文件中的內(nèi)容  Hello 95

#For example, in this example, the first column is the name and the second column is the amount

Linux 85  
test 30  cmd@hdd-desktop:~$ cat testfile_2 #testfile_2文件中的內(nèi)容  
Hello 2005 #例如，本例中第一列為姓名，第二列為年份  
Linux 2009  
test 2006

Then use the join command to connect the two files. The results are as follows:

$ join testfile_1 testfile_2 #連接testfile_1、testfile_2中的內(nèi)容  
Hello 
95 
2005 #連接后顯示的內(nèi)容  
Linux 85 2009  
test 30 2006

The locations of file 1 and file 2 have an impact on the results output to standard output. For example, to exchange the two files in the command, enter the following command:

join testfile_2 testfile_1
The final output result on the standard output will change, as follows:

$ join testfile_2 testfile_1 #改變文件順序連接兩個(gè)文件  
Hello 2005 95 
#連接后顯示的內(nèi)容  
Linux 2009 85  
test 2006 30