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Full Discussion: grep variable
Top Forums Shell Programming and Scripting grep variable Post 302704525 by tiberione on Saturday 22nd of September 2012 01:12:24 AM
Old 09-22-2012
grep variable
I've got a file that I'm trying to grep through that looks like this:

Code:
alpha1
alpha2
alpha3
beta1
beta2
gamma5
gamma6
gamma7
gamma8
gamma9

and I want the output to only contain the line with the highest value for each, so the output I want is:

Code:
alpha3
beta2
gamma9

I also need to make it understand that there may be new values like delta and epsilon etc added down the track and to just extract the highest numbered line.

how do I do this? really pulling my hair out, I've googled for hours. thanks so much!
Last edited by Scrutinizer; 09-22-2012 at 07:32 AM.. Reason: code tags
tiberione
 

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LEARN ABOUT X11R4

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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