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Top Forums Shell Programming and Scripting Using Bash/Sed to delete between identical strings Post 302496076 by Zykr on Saturday 12th of February 2011 05:14:36 AM
Old 02-12-2011
Question 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. Smilie



Thanks for reading. -Zykr
 

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CAT(1)							      General Commands Manual							    CAT(1)

NAME
cat - catenate and print SYNOPSIS
cat [ -u ] [ -n ] [ -s ] [ -v ] file ... DESCRIPTION
Cat reads each file in sequence and displays it on the standard output. Thus cat file displays the file on the standard output, and cat file1 file2 >file3 concatenates the first two files and places the result on the third. If no input file is given, or if the argument `-' is encountered, cat reads from the standard input file. Output is buffered in the block size recommended by stat(2) unless the standard output is a terminal, when it is line buffered. The -u option makes the output completely unbuffered. The -n option displays the output lines preceded by lines numbers, numbered sequentially from 1. Specifying the -b option with the -n option omits the line numbers from blank lines. The -s option crushes out multiple adjacent empty lines so that the output is displayed single spaced. The -v option displays non-printing characters so that they are visible. Control characters print like ^X for control-x; the delete char- acter (octal 0177) prints as ^?. Non-ascii characters (with the high bit set) are printed as M- (for meta) followed by the character of the low 7 bits. A -e option may be given with the -v option, which displays a `$' character at the end of each line. Specifying the -t option with the -v option displays tab characters as ^I. SEE ALSO
cp(1), ex(1), more(1), pr(1), tail(1) BUGS
Beware of `cat a b >a' and `cat a b >b', which destroy the input files before reading them. 4th Berkeley Distribution May 5, 1986 CAT(1)
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