Linux uses join -a1 to merge two files

To merge the following two files, merge them together and merge them into 1.txt

# 1.txt
Jerry 20
Alice 30
David 40
# 2.txt
Jerry man
Alice woman
David 40

Merged 1.txt

Jerry 20 man
Alice 30 woman
David 40

The above files have the same characteristics, so they are merged, and the second column is missing. At this time, using join -a1 1.txt 2.txt can achieve the purpose well.

[root@host ~]# join -a1 1.txt 2.txt
Jerry 20 man
Alice 30 woman
David 40

• -a: In addition to displaying the matched lines, also display the matching lines in the specified sequence number (1 or 2) file
• -1: Match the FIELD field in file1

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