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
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I am looking to replace two or more strings on different lines using sed, but not with the same variable. IE
# cat xxx.file
<abc>
abc def ghi
abc def ghi
abc def ghi
currently I can only change each line with the same pattern:
# sed -e '/<abc>/!s/abc\(.*\)/jkl mno/' xxx.file
abc jkl mno... (3 Replies)
Discussion started by: prkfriryce
3 Replies
2. SuSE
i have a problem in finding block of identical strings...i solved the problem in finding consecutive identical words and now i want to expand the code in order to find and remove consecutive identical block of strings...
for example the awk code removing consecutive identical word is:... (2 Replies)
Discussion started by: cocostaec
2 Replies
3. Programming
i have a problem in finding block of identical strings...i solved the problem in finding consecutive identical words and now i want to expand the code in order to find and remove consecutive identical block of strings...
for example the awk code removing consecutive identical word is:... (2 Replies)
Discussion started by: cocostaec
2 Replies
4. Shell Programming and Scripting
i have a problem in finding block of identical strings...i solved the problem in finding consecutive identical words and now i want to expand the code in order to find and remove consecutive identical block of strings...
for example the awk code removing consecutive identical word is:... (2 Replies)
Discussion started by: cocostaec
2 Replies
5. Shell Programming and Scripting
Hi. I have to delete the content between all the occurrences of the xml tags in a single file.
For example:
* The tags <script>.....................</script> occurs more than once in the same file.
* It follows tagging rules meaning a start tag will be followed by an end tag. Will not have... (9 Replies)
Discussion started by: satheeshkumar
9 Replies
6. Shell Programming and Scripting
Hi guys, I wonder if it's possible to search for a line containing 2 strings and delete that line and perhaps replace the source file with already deleted line(s).
What I mean is something like this:
sourcefile.txt
line1: something 122344 somethin2 24334 45554676
line2: another something... (6 Replies)
Discussion started by: netrom
6 Replies
7. Shell Programming and Scripting
Hi,
I have two files: a.doc and b.txt
I wish to search the strings from file b.txt in a.doc and want to highlight them in a.doc with different colours using Perl or bash./awk/sed?
Please guide me. :)
Thanks!!!!! (10 Replies)
Discussion started by: bioinfo
10 Replies
8. Ubuntu
Hi
I have a data frame with repeated names in column 1, and different descriptors in column 2. I want to merge/cat strings that have same entry in column 1 into one row with any separator.
Example for input:
Cvel_1 KOG0155
Cvel_1 KOG0306
Cvel_1 KOG3259
Cvel_1 ... (4 Replies)
Discussion started by: Alyaa
4 Replies
9. Shell Programming and Scripting
hey,
i m having a hard time trying to print only the first occurrence between 2 idenicale strings.
for the following output:
please
help
me im a
noob
please
im a noob
help me
noob
please
help
me im a
noob
please
im a noob
help me
noob (3 Replies)
Discussion started by: boaz733
3 Replies
10. UNIX for Beginners Questions & Answers
Hi,
I have a file as follows.
file1
Hello
Hi
His
Hi
Hi
Hungry
hi
so I want to delete identical lines while leaving one of them undeleted.
So desired output will be
Hello
Hi (2 Replies)
Discussion started by: beginner_99
2 Replies
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)