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Full Discussion: Translate grep to awk
Top Forums Shell Programming and Scripting Translate grep to awk Post 302752265 by SkySmart on Sunday 6th of January 2013 01:51:37 PM
Old 01-06-2013
Quote:
Originally Posted by Scrutinizer
I do not really see what this all brings, I think I would prefer the two greps to the awk solutions, because they are easier to understand and thus to maintain. One could go even further and put everything in one awk:

Code:
awk '
NR==2,NR==10 {
  if (/error/) {
    if(/memory/) {
      m=m RS $0
      i++
    } 
    else {
      o=o RS $0
      j++ 
    }
  }
} 
END{
  print i m RS j o 
}
' file

This probably would make it more efficient, but one could ask if that is required and the down side is that it is also less simple...


--


Ehm.. I don't agree with that.. SmilieSmilie

thank you!

the thing is, i have a very huge script that uses quite a lot of egreps like those in my first post. however, while the script runs beautifully, i notice there are just too many commands being called in it. commands that, if given thought can be combined into one by a more advanced user. which is why i created this thread.

bipinajith's one-liner solution not only helps to combine the egreps in my post, it also got rid of the sed. so in essence, his awk did what i (not an advanced user) was trying to do with 3 commands (sed, egrep, egrep).

i'm making the modifcations to my script as we speak. and i'll see if the awk solution helps to decrease the script's overall processing time.

btw, can you please combine your awk suggestion into a one-liner? i think its easier to read for a novice if anywhere is in one line. if you can, please explain the code for me.
 

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XZGREP(1)							     XZ Utils								 XZGREP(1)

NAME
xzgrep - search compressed files for a regular expression SYNOPSIS
xzgrep [grep_options] [-e] pattern file... xzegrep ... xzfgrep ... lzgrep ... lzegrep ... lzfgrep ... DESCRIPTION
xzgrep invokes grep(1) on files which may be either uncompressed or compressed with xz(1), lzma(1), gzip(1), or bzip2(1). All options specified are passed directly to grep(1). If no file is specified, then the standard input is decompressed if necessary and fed to grep(1). When reading from standard input, gzip(1) and bzip2(1) compressed files are not supported. If xzgrep is invoked as xzegrep or xzfgrep then egrep(1) or fgrep(1) is used instead of grep(1). The same applies to names lzgrep, lze- grep, and lzfgrep, which are provided for backward compatibility with LZMA Utils. ENVIRONMENT
GREP If the GREP environment variable is set, xzgrep uses it instead of grep(1), egrep(1), or fgrep(1). SEE ALSO
grep(1), xz(1), gzip(1), bzip2(1), zgrep(1) Tukaani 2009-07-05 XZGREP(1)
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