shell command --join
0, join the exclusive command map bed
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1, the function join command Description
join
Command for the two files, the same line specifies the contents of the field are connected. Find two files, specify the contents of the field the same line and be merged, and then output to the standard output device.
2, join command syntax
SYNOPSIS join [OPTION]... FILE1 FILE2
3, join command options Description
- -a <1 or 2>: In addition to displaying the contents of the original output but also the file does not show the same command line field.
- -e <string>: If [Document 1] and [Document 2] was not found in the appropriate field, option character string is filled in the output.
- -i or --igore-case: comparing the contents of the field, ignoring case differences.
- -o <format>: according to the specified format to display the results.
- -t <character>: Use the field separator character.
- -v <1 or 2>: with -a same, but the file does not only show the same field line.
- -1 <field>: connection [Document 1] specified field.
- -2 <field>: connection [Document 2] in a designated field.
- --help: Displays help.
- --version: show the version information.
4, hands-join command
Example 1: Joins the two files
Preparing the Environment
cat >file1.txt <<'EOF' Hello 1 Linux 11 Test 111 EOF cat >file2.txt <<'EOF' Hello 2 Linux 22 Test 222 EOF cat file1.txt cat file2.txt
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Connection file
Position of the file 1 and the file 2 of the result output to the standard output is influential
join file1.txt file2.txt -->连接方式1 join file2.txt file1.txt -->连接方式2
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