command: join
usage: join lines of two files on a common field
syntax: $ join [OPTION]... FILE1 FILE2
examples:
1. To find options and help info of this command
$ join --help
2. $ cat > file1.txt
1 india
2 uk
3 us
4 nepal
5 australia
$ cat > file2.txt
1 newdelhi
2 london
3 washington
4 kathmandu
5 canberra
to join file 1 and file 2 which is sorted
$ join file1.txt file2.txt
1 india newdelhi
2 uk london
3 us washington
4 nepal kathmandu
5 australia canberra
If the input is not sorted lines cannot be joined, a warning
message will be given.
3. To ignore cases when comparing file fields
$ join -i file1.txt file2.txt
4. To verify that input is sorted
$ join --check-order file1.txt file2.txt
5. To not to check that input is sorted
$ join --nocheck-order file1.txt file2.txt
6. To print unpairable lines
$ join -a1 file1.txt file2.txt
7. To print only unpaired lines
$ join -v1 file1.txt file2.txt
8. To print help info of this command
$ join --help
regards,
dhanasekar
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