Shell Programming and Scripting

sed -i -e '/GuestUser/w output_file' -e '/GuestUser/d'  input_file

# 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
}

awk -f log.awk <list of files>

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>

@ARGV = ("f1");
$^I = ".bak";
open(OP, ">f1.out");
while (<>) {
  if (/xyz/) {print OP}
  else {print}
}