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Top Forums Shell Programming and Scripting Print rows, having pattern in specific column... Post 302359157 by jp2542a on Tuesday 6th of October 2009 01:58:34 AM
Old 10-06-2009
pattern_file and data_file are just place holders for the actual paths to your files.

For instance if /export/home/user/real.txt is the path to the file with the patterns and /export/home/user/thedata.txt is the path to the data file, then the command line would be:

Code:
awk 'NR == FNR { A[$1] = $1; next } A[$3]' /export/home/user/real.txt /export/home/user/thedata.txt

And I just noticed something. $2..$n don't exist. So A[$1] will have no value and hence not exist either.
 

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MEWL(1) 						      General Commands Manual							   MEWL(1)

NAME
mewl - Message scanner for Mew 4 or later SYNOPSIS
mewl [options] [folder [range]] DESCRIPTION
The mewl utility extracts necessary fields from messages stored in folders. This command is necessary for Mew to implement the asynchro- nous feature. The options are as follows: -a Print all necessary fields when picking. -b dir Set the Mail home to dir. -c bodylen Set the max body length to be extracted to bodylen. -d field Set the field to be extracted to field. -e command Specify an external command to fetch mailbox. -m options Specify options for command. -f fields Specify fields to display. -h Display this help message. -i file Set the input stream to file. -l length Set the max field length to be extracted to length. The default value is 3. 0 means no limit. -n Don't use fstat(). -p pattern Specify the pick pattern. -s src Set message source to src : '+folder range'. -w Wait for stdio input to synchronize. -v Display the version. -x suffix Use this suffix. Definitions of the symbols above are as follows: range N | [start]-[end] | last:N pattern 'key=val' | 'key!=val' | '!<pattern>' | '(<pattern>)' | '<pattern>&<pattern>' | '<pattern>|<pattern>' BUGS
If a field is long, only the beginning three lines are extracted by default. March 5, 2003 MEWL(1)
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