02-12-2011
Using Bash/Sed to delete between identical strings
Hi. I'm hoping that someone can help me with a bash script to delete a block of lines from a file.
What I want to do is delete every line between two stings that are the same,
including the line the first string is on but not the second.
(Marked lines to match with !)
For example if I have:
fish
! cat
dog
ferret
lion
etc
! cat
kitten
zebra
What I'm looking to get is:
fish
cat
kitten
zebra
I've been trying to work out how to do this with sed but haven't had much luck.
Some 3-4 hours in, the closest I've gotten is deleting between the strings, or deleting both strings.
Thanks for reading. -Zykr
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CAT(1) FSF CAT(1)
NAME
cat - concatenate files and print on the standard output
SYNOPSIS
cat [OPTION] [FILE]...
DESCRIPTION
Concatenate FILE(s), or standard input, to standard output.
-A, --show-all
equivalent to -vET
-b, --number-nonblank
number nonblank output lines
-e equivalent to -vE
-E, --show-ends
display $ at end of each line
-n, --number
number all output lines
-s, --squeeze-blank
never more than one single blank line
-t equivalent to -vT
-T, --show-tabs
display TAB characters as ^I
-u (ignored)
-v, --show-nonprinting
use ^ and M- notation, except for LFD and TAB
--help display this help and exit
--version
output version information and exit
With no FILE, or when FILE is -, read standard input.
AUTHOR
Written by Torbjorn Granlund and Richard M. Stallman.
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 cat is maintained as a Texinfo manual. If the info and cat programs are properly installed at your site, the
command
info cat
should give you access to the complete manual.
cat (coreutils) 4.5.3 February 2003 CAT(1)