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Shell Programming and Scripting
How to grep in order based on the input file
Post 28711 by Kelam_Magnus on Monday 23rd of September 2002 02:05:02 PM
09-23-2002
How to grep in order based on the input file
Here is an answer rather than a question that I thought I would share.
In my first attempt, I was using grep to find a list from file.1 within another file, file.2 which I then needed to paste the output from file.3 to file.1 in the same order. However, the results weren't what I wanted.
At first, I did it using the following line:
grep -f file.1 file2 > file.3
However, this didn't give the output in the same order as the input file. Rather it gave me the output using the order of the file.2 that was being searched. So file.3 was output using the sort order of file.2 not file.1 as I had wanted.
My problem was that I am wanting to compare the output of file.3 to the original file file.1 and wanted the output in the same order as the search file file.1.
************
This lead me to the following solution. I know it seems simple, but it is very effective to output in the same order as the search file.
for name in `cat file.1 `
do
grep $name file.2
done > file.3
This gives me file.3 in the same order as file.1 is in. Which I can then paste to file.1 for a report.
I offer this to anyone who needs something like this.
Hope it helps!!!
In my first attempt, I was using grep to find a list from file.1 within another file, file.2 which I then needed to paste the output from file.3 to file.1 in the same order. However, the results weren't what I wanted.
At first, I did it using the following line:
grep -f file.1 file2 > file.3
However, this didn't give the output in the same order as the input file. Rather it gave me the output using the order of the file.2 that was being searched. So file.3 was output using the sort order of file.2 not file.1 as I had wanted.
My problem was that I am wanting to compare the output of file.3 to the original file file.1 and wanted the output in the same order as the search file file.1.
************
This lead me to the following solution. I know it seems simple, but it is very effective to output in the same order as the search file.
for name in `cat file.1 `
do
grep $name file.2
done > file.3
This gives me file.3 in the same order as file.1 is in. Which I can then paste to file.1 for a report.
I offer this to anyone who needs something like this.
Hope it helps!!!
This User Gave Thanks to Kelam_Magnus For This Post:
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LEARN ABOUT MINIX
zgrep
ZGREP(1) General Commands Manual ZGREP(1) NAME
zgrep - search possibly compressed files for a regular expression SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename... DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code: (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep. If the GREP environment variable is set, zgrep uses it as the grep program to be invoked. EXIT CODE
2 - An option that is not supported was specified. AUTHOR
Charles Levert (charles@comm.polymtl.ca) SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1) ZGREP(1)