10-03-2011
Extract Lines Containg a Keyword
Hi ,
I have two files, say KEY_FILE and the MAIN_FILE. I am trying to read the KEY_FILE which has only one column and look for this column data in the MAIN_FILE to extract all the rows that have this key.
I have written a script to do so, but somehow it is not returning all the rows (
It gives the data for last row in KEY_FILE only.
). I feel there is something wrong with the loop. Here is the script
Quote:
#!/bin/ksh
KEY_FILE=KeyFile.txt
MAIN_FILE=MainFile.txt
OUTPUT_FILE=Output.txt
while read inputline
do
column=`echo "$inputline" | awk '{print $0}'`
grep "$column" $MAIN_FILE > $OUTPUT_FILE
done < $KEY_FILE
Please see what i am missing here & do advise a better way if possible. Thanks.
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COLRM(1) BSD General Commands Manual COLRM(1)
NAME
colrm -- remove columns from a file
SYNOPSIS
colrm [start [stop]]
DESCRIPTION
The colrm utility removes selected columns from the lines of a file. A column is defined as a single character in a line. Input is read
from the standard input. Output is written to the standard output.
If only the start column is specified, columns numbered less than the start column will be written. If both start and stop columns are spec-
ified, columns numbered less than the start column or greater than the stop column will be written. Column numbering starts with one, not
zero.
Tab characters increment the column count to the next multiple of eight. Backspace characters decrement the column count by one.
ENVIRONMENT
The LANG, LC_ALL and LC_CTYPE environment variables affect the execution of colrm as described in environ(7).
EXIT STATUS
The colrm utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
awk(1), column(1), cut(1), paste(1)
HISTORY
The colrm command appeared in 3.0BSD.
BSD
August 4, 2004 BSD