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Full Discussion: Concatenate values in the first column based on the second column.
Top Forums Shell Programming and Scripting Concatenate values in the first column based on the second column. Post 302965448 by shoaibjameel123 on Friday 29th of January 2016 06:35:40 AM
Old 01-29-2016
[Solved] Concatenate values in the first column based on the second column.
I have a file (myfile.txt) with contents like this:

Code:
1.txt apple is
3.txt apple is
5.txt apple is
2.txt apple is a
7.txt apple is a
8.txt apple is a fruit
4.txt orange not a fruit
6.txt zero is

The above file is already sorted using this command:
Code:
sort -k2 myfile.txt

My objective is to get this:
Code:
1.txt_3.txt_5.txt apple is
2.txt_7.txt apple is a
8.txt apple is a fruit
4.txt orange not a fruit
6.txt zero is

You can notice that if the text in the second column is same as we go downwards, we concatenate the values from the first column until they remain the same.

This is what I have tried, but not working perfectly well:
Code:
awk -F' ' 'NF>2{a[$2] = a[$2]"_"$1}END{for(i in a){print a[i]" "i}}' myfile.txt

The output that I get using the above command is this:
Code:
_4.txt orange
_1.txt_3.txt_5.txt_2.txt_7.txt_8.txt apple
_6.txt zero

Any help? I am using Linux with BASH.
Last edited by shoaibjameel123; 01-29-2016 at 09:54 AM.. Reason: Changed bigram.txt to myfile.txt for clarity
 

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LEARN ABOUT DEBIAN

ecaccess-file-move

ECACCESS-FILE-MOVE(1p)					User Contributed Perl Documentation				    ECACCESS-FILE-MOVE(1p)

NAME

       ecaccess-file-move - Move or Rename ECaccess Files

SYNOPSIS

       ecaccess-file-move -version|-help|-manual

       ecaccess-file-move [-debug] source-ecaccess-file target-ecaccess-file

DESCRIPTION

       Allow moving an ECaccess File. When the move occurs within the same ECaccess File System then it is a rename. When the move occurs across
       two different ECaccess File Systems then first a copy is done and then a delete of the original file is done (e.g. similar to ecaccess-
       file-copy ... -erase).

       The source-ecaccess-file and target-ecaccess-file are in the form [domain:][/user-id/]path. Please read the "Shell commands -> File
       Management" section of the "ecaccess" guide for more information on the ECaccess File System.

ARGUMENTS

       source-ecaccess-file
	       The source ECaccess File name.

       target-ecaccess-file
	       The target ECaccess File name.

OPTIONS

       -version
	       Display version number and exits.

       -help   Print a brief help message and exits.

       -manual Prints the manual page and exits.

       -debug  Display the SOAP messages exchanged.

EXAMPLES

       ecaccess-file-move ec:test1.txt ec:test2.txt

       Rename the test1.txt file in the ECFS directory of the authenticated user in test2.txt.

       ecaccess-file-move ec:test1.txt home:test2.txt

       Copy the test1.txt file from the ECFS directory of the authenticated user to the test2.txt file in the $HOME directory of the authenticated
       user, then delete the test1.txt file from ECFS.

SEE ALSO

       ecaccess-file-delete, ecaccess-file-get, ecaccess-file-mget, ecaccess-file-modtime, ecaccess-file-mput, ecaccess-file-rmdir, ecaccess-file-
       copy, ecaccess-file-dir, ecaccess-file-mdelete, ecaccess-file-mkdir, ecaccess-file-chmod, ecaccess-file-put, ecaccess-file-size and
       ecaccess.

perl v5.14.2							    2012-04-16						    ECACCESS-FILE-MOVE(1p)
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