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Top Forums UNIX for Dummies Questions & Answers Removing Lines based on matching first column Post 302539691 by kschiltz55 on Monday 18th of July 2011 11:45:48 AM
Old 07-18-2011
Removing Lines based on matching first column

I have a file1 that looks like this:

File 1
a b
b c
c e
d e

and a file 2 that looks like this:

File 2
b
c
e
e

Note that file 2 is the right hand column from file1. I want to remove any lines from file1 that begin with the column in file2. In this case the desired output would be

File 3
a b
d e

I think awk would be best, unless someone knows how to grep only looking a specific columns.

thanks in advance!
 

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PASTE(1)						      General Commands Manual							  PASTE(1)

NAME
paste - paste multiple files together SYNOPSIS
paste [-s] [-d list] file... OPTIONS
-d Set delimiter used to separate columns to list. -s Print files sequentially, file k on line k. EXAMPLES
paste file1 file2 # Print file1 in col 1, file2 in col 2 paste -s f1 f2 # Print f1 on line 1 and f2 on line 2 paste -d : file1 file2 # Print the lines separated by a colon DESCRIPTION
Paste concatenates corresponding lines of the given input files and writes them to standard output. The lines of the different files are separated by the delimiters given with the option -s. If no list is given, a tab is substituted for every linefeed, except the last one. If end-of-file is hit on an input file, subsequent lines are empty. Suppose a set of k files each has one word per line. Then the paste output will have k columns, with the contents of file j in column j. If the -s flag is given, then the first file is on line 1, the second file on line 2, etc. In effect, -s turns the output sideways. If a list of delimiters is given, they are used in turn. The C escape sequences , , \, and are used for linefeed, tab, backslash, and the null string, respectively. PASTE(1)
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