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Full Discussion: Splitting a file based on record sin another file
Top Forums UNIX for Dummies Questions & Answers Splitting a file based on record sin another file Post 302194492 by era on Tuesday 13th of May 2008 03:26:13 AM
Old 05-13-2008
If your grep can read patterns from a file (like GNU grep), try something like this.

Code:
cut -c1-5 file2 >patterns
grep -f patterns file1 >matches
grep -f patterns -v file1 >nonmatches

There is some room for improvement, relating to making the patterns always match at beginning of line, etc. You could replace the first line with something like

Code:
sed 's/^\(.....\).*/^"\1",/' file2 >patterns

This adds the double quotes around the search string and adds a comma behind it and the special character "^" before it, which means match only at beginning of line.
Last edited by era; 05-13-2008 at 04:28 AM.. Reason: Explain revised patterns
 

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LEARN ABOUT LINUX

zegrep

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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