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Full Discussion: Need to remove certain records off a file.
Top Forums UNIX for Dummies Questions & Answers Need to remove certain records off a file. Post 302696133 by mjf on Tuesday 4th of September 2012 10:33:48 AM
Old 09-04-2012
Here is a solution using grep. It involves using -f option to read patterns stored in a file (key_file) and using regular expression to search starting at the 5th position.

Code:
cat key_file
^....12345

Code:
grep -vf key_file master_file > new_file

Last edited by mjf; 09-04-2012 at 12:00 PM..
 

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LEARN ABOUT POSIX

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)
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