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Top Forums UNIX for Beginners Questions & Answers Get information from one files, based on data from other file Post 303019575 by jgt on Monday 2nd of July 2018 10:57:35 AM
Old 07-02-2018
The lazy way if you just have to run it once.
Code:
while read cc
do
   echo $cc $(grep -c "^$cc" fileb)
done <filea

If you have to run this frequently, or the number of records in filea is large then you may want to first sort fileb and create a "rolling totals" type program.
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ZGREP(1)						    BSD General Commands Manual 						  ZGREP(1)

NAME
zgrep, zegrep, zfgrep -- print lines matching a pattern in gzip-compressed files SYNOPSIS
zgrep [grep-flags] [--] pattern [files ...] zegrep [grep-flags] [--] pattern [file ...] zfgrep [grep-flags] [--] pattern [file ...] DESCRIPTION
zgrep runs grep(1) on files or stdin, if no files argument is given, after decompressing them with zcat(1). The grep-flags and pattern arguments are passed on to grep(1). If an -e flag is found in the grep-flags, zgrep will not look for a pattern argument. zegrep calls egrep(1), while zfgrep calls fgrep(1). EXIT STATUS
In case of missing arguments or missing pattern, 1 will be returned, otherwise 0. SEE ALSO
egrep(1), fgrep(1), grep(1), gzip(1), zcat(1) AUTHORS
Thomas Klausner <wiz@NetBSD.org> BSD
December 28, 2003 BSD
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