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Top Forums Shell Programming and Scripting Replace column that matches specific pattern, with column data from another file Post 302640945 by prashali on Tuesday 15th of May 2012 01:00:09 PM
Old 05-15-2012
Replace column that matches specific pattern, with column data from another file

Can anyone please help with this? I have 2 files as given below.
If 2nd column of file1 has pattern foo1@a, find the matching 1st column in file2 & replace 2nd column of file1 with file2's value.

Code:
file1

abc_1    foo1@a   ....
abc_1    soo2@a ...
def_2    soo2@a  ....
def_2    foo1@a .....
ghi_3    foo1@a .....
ghi_3    soo1@a

file2

Code:
def_2    foo2@a
def_2    soo2@a
abc_1     foo3@a
abc_1     soo1@a        
ghi_3      foo2@a
ghi_3    soo1@a

Required output ( file1 modified to be):

Code:
abc_1    foo3@a
abc_1    soo2@a
def_2    soo2@a
def_2    foo2@a
ghi_3    foo2@a
ghi_3    soo1@a

Moderator's Comments:
Mod Comment Code tags for code, please.

Last edited by Corona688; 05-15-2012 at 02:24 PM..
 

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XZDIFF(1)							     XZ Utils								 XZDIFF(1)

NAME
xzcmp, xzdiff, lzcmp, lzdiff - compare compressed files SYNOPSIS
xzcmp [cmp_options] file1 [file2] xzdiff [diff_options] file1 [file2] lzcmp [cmp_options] file1 [file2] lzdiff [diff_options] file1 [file2] DESCRIPTION
xzcmp and xdiff invoke cmp(1) or diff(1) on files compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to cmp or diff. If only one file is specified, then the files compared are file1 (which must have a suffix of a supported com- pression format) and file1 from which the compression format suffix has been stripped. If two files are specified, then they are uncom- pressed if necessary and fed to cmp(1) or diff(1). The exit status from cmp or diff is preserved. The names lzcmp and lzdiff are provided for backward compatibility with LZMA Utils. SEE ALSO
cmp(1), diff(1), xz(1), gzip(1), bzip2(1), zdiff(1) BUGS
Messages from the cmp(1) or diff(1) programs refer to temporary filenames instead of those specified. Tukaani 2009-07-05 XZDIFF(1)
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