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Full Discussion: How to remove the last 3 lines from many files?
Top Forums Shell Programming and Scripting How to remove the last 3 lines from many files? Post 302662807 by MaRiOsGR on Wednesday 27th of June 2012 06:41:40 AM
Old 06-27-2012
This worked great.
And thank you.

but I've found a "bug" (i'm the fault),
I've found that in a 5% percent of the .js files the code I want to remove/erase
was not added in the last 3 lines but in the same line as the rest of the normal javascript code.
the exact hack code starts with
Code:
/*km0ae9gr6m*/

is it possible to remove everything after this code in all files that contain it ?

Quote:
Originally Posted by radoulov
Yes:

Code:
find /vhost -type f -name '*.js' -exec bash -c '
  f=$1
  grep -q km0ae9gr6m "$f" &&
    tac "$f" | 
      tail -n +4 |
        tac > "$f"_tmp_ && 
          mv -- "$f"_tmp_ "$f" 
  ' - {} \;

 

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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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