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Top Forums Shell Programming and Scripting awk to compare lines of two files and print output on screen Post 302177816 by chlfc on Sunday 23rd of March 2008 04:09:08 PM
Old 03-23-2008
awk to compare lines of two files and print output on screen

hey guys, I have two files both with two columns, I have already created an
awk code to ignore certain lines (e.g lines that start with 963) as they wou
ld begin with a certain string, however, the rest I have added together and
calculated the average.

At the moment the code also displays the two files in one list showing just
the lines it used to calculate the average.

e.g
Code:
FILE1
812353124 54
812535352 55
864235235 99
963352351 35

FILE2 
812353124 75
815342325 93
864235235 52
963546253 46

***
output on screen
Code:
812353124 54
812535352 55
864235235 99
812353124 75
815342325 93
864235235 52

Average: <number calculated>

***

What I want to do now though is to compare each line on both files, and if t
he first column of a line matches one in the second file, it will print a th
ird column with that file. If one line doesn't match in the other file, the
third column will have a * on that line.

Example of output
Code:
812353124 54 75
812535352 55 *
864235235 99 52
812353124 75 *
815342325 93 *

as you can see, there are no doubles of lines that match in the first column
 

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SDIFF(1)							   User Commands							  SDIFF(1)

NAME
sdiff - side-by-side merge of file differences SYNOPSIS
sdiff [OPTION]... FILE1 FILE2 DESCRIPTION
Side-by-side merge of differences between FILE1 and FILE2. Mandatory arguments to long options are mandatory for short options too. -o, --output=FILE operate interactively, sending output to FILE -i, --ignore-case consider upper- and lower-case to be the same -E, --ignore-tab-expansion ignore changes due to tab expansion -Z, --ignore-trailing-space ignore white space at line end -b, --ignore-space-change ignore changes in the amount of white space -W, --ignore-all-space ignore all white space -B, --ignore-blank-lines ignore changes whose lines are all blank -I, --ignore-matching-lines=RE ignore changes whose lines all match RE --strip-trailing-cr strip trailing carriage return on input -a, --text treat all files as text -w, --width=NUM output at most NUM (default 130) print columns -l, --left-column output only the left column of common lines -s, --suppress-common-lines do not output common lines -t, --expand-tabs expand tabs to spaces in output --tabsize=NUM tab stops at every NUM (default 8) print columns -d, --minimal try hard to find a smaller set of changes -H, --speed-large-files assume large files, many scattered small changes --diff-program=PROGRAM use PROGRAM to compare files --help display this help and exit -v, --version output version information and exit If a FILE is `-', read standard input. Exit status is 0 if inputs are the same, 1 if different, 2 if trouble. AUTHOR
Written by Thomas Lord. REPORTING BUGS
Report bugs to: bug-diffutils@gnu.org GNU diffutils home page: <http://www.gnu.org/software/diffutils/> General help using GNU software: <http://www.gnu.org/gethelp/> COPYRIGHT
Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
cmp(1), diff(1), diff3(1) The full documentation for sdiff is maintained as a Texinfo manual. If the info and sdiff programs are properly installed at your site, the command info sdiff should give you access to the complete manual. diffutils 3.3 March 2013 SDIFF(1)
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