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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 XFREE86

logsave

LOGSAVE(8)						      System Manager's Manual							LOGSAVE(8)

NAME

       logsave - save the output of a command in a logfile

SYNOPSIS

       logsave [ -asv ] logfile cmd_prog [ ... ]

DESCRIPTION

       The  logsave  program  will  execute  cmd_prog with the specified argument(s), and save a copy of its output to logfile.  If the containing
       directory for logfile does not exist, logsave will accumulate the output in memory until it can be written out.	A copy of the output  will
       also be written to standard output.

       If  cmd_prog  is a single hyphen ('-'), then instead of executing a program, logsave will take its input from standard input and save it in
       logfile

       logsave is useful for saving the output of initial boot scripts until the /var partition is mounted,  so  the  output  can  be  written	to
       /var/log.

OPTIONS

       -a     This option will cause the output to be appended to logfile, instead of replacing its current contents.

       -s     This  option  will  cause  logsave  to  skip writing to the log file text which is bracketed with a control-A (ASCII 001 or Start of
	      Header) and control-B (ASCII 002 or Start of Text).  This allows progress bar information to be visible to the user on the  console,
	      while not being written to the log file.

       -v     This option will make logsave to be more verbose in its output to the user.

AUTHOR

       Theodore Ts'o (tytso@mit.edu)

SEE ALSO

       fsck(8)

E2fsprogs version 1.44.1					    March 2018								LOGSAVE(8)
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