11-28-2018
ksh Script, Reading A File, Grepping A File Contents In Another File
So I'm stumped.
First... APOLOGIES... my work is offline in an office that has zero internet connectivity, as required by our client. If need be, I could print out my script attempts and retype them here. But on the off chance... here goes.
I have a text file (file_source) of terms, each line could have one, two or more words in this file.
I want to use each line from file_source as a key to grep for in a different file, (file_target)
I want to run a script that reads file_source, and uses the words from each line, to search/grep in file_target.
IE: grep "one first word" file_target, or just grep "second" file_target, etc.
In my first attempted script I have run a=`cat file_source`, then in a do loop, tried to grep "$a" file_another.
But instead of looking for all the words in one line, the routine I've created looks for each word individually from the line it's reading.
So instead of grep "a b c" file, I got grep a file, grep b file, grep c file.
Which is great... but sometimes, I really need to know that a, b and c occurred as a phrase.
I've tried multiple ideas, from cat, to read, to while to screaming. (OK, screaming is not a function, just a reaction.)
I can get a while read routine to read the whole line of file_source, but then trying to use the line to grep for in file_target fails wonderfully, saying something to the effect of source not found or what not.
I've run the script in the directory of the file I want to look at, calling out the file, and also run it pointing to the full path/file, to no avail.
If anyone has quick suggestions, outlines, ideas, or examples, WITHOUT burning up too much of your time, I'd appreciate it.
Thank you.
Bruce
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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)