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Full Discussion: Retreive the records from file2 by using the first field in file1
Top Forums Shell Programming and Scripting Retreive the records from file2 by using the first field in file1 Post 302717329 by elixir_sinari on Thursday 18th of October 2012 03:32:05 AM
Old 10-18-2012
Assuming that file2 is also a pipe-separated file and you wish to match the first fields of the 2 files (i.e., 1 will match only 1 and not 12,132,etc.), try:
Code:
awk 'FNR==NR{a[$1];next}$1 in a' FS=\| file1 file2 > out.txt

@pamu
You don't need to open out.txt multiple times in the loop. Just keep it open for the duration of the loop. That'll be more efficient.
Code:
while IFS='|' read x y
do
grep "^$x|" file2
done < file1 > out.txt

This User Gave Thanks to elixir_sinari For This Post:
i150371485
 

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xzdiff

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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