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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 302662763 by radoulov on Wednesday 27th of June 2012 05:49:03 AM
Old 06-27-2012
On Linux you could use something like this:

Code:
for f in /var/ww/vhost/*js; do 
  tac "$f" | 
    tail -n +4 |
      tac > "$f"_tmp_ && 
        mv -- "$f"_tmp_ "$f" 
done

Backup your data first!
Last edited by radoulov; 06-27-2012 at 07:02 AM..
 

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LEARN ABOUT XFREE86

tac

TAC(1)								   User Commands							    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

       GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
       Report tac translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2017 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       rev(1)

       Full documentation at: <http://www.gnu.org/software/coreutils/tac>
       or available locally via: info '(coreutils) tac invocation'

GNU coreutils 8.28						   January 2018 							    TAC(1)
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