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Linux commonly used command join command is used to connect lines in two files that have the same field content. Find the lines in the two files that specify the same field content, merge them, and then output them to the standard output device.

Join concatenates lines with the same field contents in two files

Syntax join (option) (parameter) option-a: displays lines in the instruction file that do not have the same field in addition to the original output;-e: if the specified field cannot be found in [file 1] and [file 2], fill in the string in the option in the output;-I or-- ignore-case: ignore the difference in case when comparing field contents -o: display the results in the specified format;-t: use the split characters of the field;-v: more-an is the same, but only show lines in the file that do not have the same field;-1: connect the field specified in [file 1];-2: connect the field specified in [file 2]. Parameter file 1: the first file parameter to merge

File 2: the second file parameter to merge.

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