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Full Discussion: One more awk question!
Top Forums Shell Programming and Scripting One more awk question! Post 59083 by zazzybob on Thursday 9th of December 2004 09:42:23 AM
Old 12-09-2004
What do you mean search up? Do you want to search the file from bottom line to top line?

You could do something like (if you have the tac command - Linux should have)

Code:
tac my_file | awk '{do something}'

Either way, you're not going to be able to achieve this in the "same" awk statement as you've posted.

You can, however (if searching from top to bottom doesn't bother you), just add another action to the existing awk.

e.g.
Code:
awk '
{
  if ($0 ~ /STRING1/) {
     c++
  } 
}
{ 
  if ( c == 2 ) {
     sub(/STRING1/,"NEWSTRING") 
  } 
} 
# perform some other substitution
{ sub(/FOO/,"BAR") }

{ print }' FILE

Cheers
ZB
 

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LEARN ABOUT REDHAT

tac

TAC(1)									FSF								    TAC(1)

NAME

       tac - concatenate and print files in reverse

SYNOPSIS

       tac [OPTION]... [FILE]...

DESCRIPTION

       Write each FILE to standard output, last line first.  With no FILE, or when FILE is -, read standard input.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --before
	      attach the separator before instead of after

       -r, --regex
	      interpret the separator as a regular expression

       -s, --separator=STRING
	      use STRING as the separator instead of newline

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by Jay Lepreau and David MacKenzie.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for tac is maintained as a Texinfo manual.  If the info and tac programs are properly installed at  your	site,  the
       command

	      info tac

       should give you access to the complete manual.

tac (coreutils) 4.5.3						   February 2003							    TAC(1)
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