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Full Discussion: Script to extract line from logfile
Top Forums Shell Programming and Scripting Script to extract line from logfile Post 302354486 by jp2542a on Friday 18th of September 2009 09:47:45 AM
Old 09-18-2009
awk is your friend :D
This is how you do it using awk.

This will create a files based on the input file names. The file without the lines you want removed will be <filename>.strip . The file with the lines removed will be <filename>.sav . <filename> is the path to the input file.

First make a file containing the awk code. I used log.awk for the example.

Code:
# strip lines out of file and make log of lines removed
# clause to make file name for output
(FNR == 1) {                    # check if first line of new file
        if ( NR != 1)           # see if this is not first file
        {
                close(FILEOUT)  # if true, then we close previous files
                close(FILELOG)
        }
        FILEOUT = FILENAME ".strip"     # create striped file name using input file name
        FILELOG = FILENAME ".sav"       # create file name for removed lines
}

# clause for ever line
{
        if ( $0 !~ /ntp/ )      # replace ntp with your pattern
                print > FILEOUT # save to stripped file if pattern not found
        else
                print > FILELOG # save to remove log if pattern match
}

Change the pattern to whatever you want to use. (GuestUser?)

Then execute it using:

Code:
awk -f log.awk <list of files>

Where <list of files> is a bunch of files you want to process. You get a set of .sav and .strip files in the same directory as the source file.

Note: I don't believe in modifying source files when not necessary. Tools such as this should not modify input files.

If for some reason you want to do the same thing in a single line, use this format:

Code:
awk '(FNR == 1) { if ( NR != 1) { close(FILEOUT); close(FILELOG) } FILEOUT = FILENAME ".strip"; FILELOG = FILENAME ".sav" } { if ( $0 !~ /YOUR-PATTERN-HERE/ ) print > FILEOUT; else print > FILELOG }' <list-of-files>

 

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LEARN ABOUT REDHAT

igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)
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