Questions tagged [sed]
sed is a command-line stream editor for filtering and transforming text.
7,393 questions
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sed: why my regex does not work correctly
So, I'm facing a curious issue with sed; I have reduced my problem down to the following. Why does
sed -e 's/\"\([^\"]*\)\">/\1/' <<< '["\{">'
return ["\{&...
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3
answers
607
views
How does -e work in sed?
This is the content of input.txt:
foo-bar
foo-baz
I want to substitute - with _ and join the two lines.
Notice the difference between using -e and a pipe when using sed:
$ sed -e 's/-/_/g' -e ':a; N;...
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Wrap long lines using GNU sed
The following expression is reasonably effective at wrapping long lines of text (for the purpose of dumping to my 128 characters wide terminal window and reading):
s~(.{104,124}) ~\1\n~g
This ...
- 864
2
votes
3
answers
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sed: invalid usage of line address 0
I need to keep only last 30 days events in the log and remove other data.
Log has timestamp (date +%e/%b/%Y:%H:%M) and next line values like
01/Jan/2025:00:00
value1
value2
...
01/Jan/2025:06:45
...
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7
votes
1
answer
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ESC/escape character `\c[` in GNU sed substitution
The ESC character is 0x1B. In GNU sed, it can be used as 0x1b. It can also be used as \c[ ²; this, however, behaves inconsistently:
sed "s/XXX/\c[/" # right-hand side, no problem
sed &...
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5
answers
379
views
How to perform sed replacement from the rule file only on certain lines?
I have rules.txt file with sed rules for replacement.
s/1/a/
s/2/b/
s/3/c/
etc...
I want to replace characters only after certain line 5.
This command does not work.
sed -n '5,$p' -f rules.txt ...
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3
votes
2
answers
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Embedded special characters skewing sed output
The Issue
I've been parsing a file with sed trying to tweeze out the desired data. This has worked fine for most lines in the file but there appears to be some embedded special characters that are ...
- 33
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7
answers
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Insert a character after every 2 character but discard first 2 characters
I want to print a colon after every 2 characters of alphanumeric Value and I found something like below. But I am not sure how to remove initial 2 characters from the output and what is the meaning of ...
- 17
4
votes
4
answers
450
views
Remove new lines and everything after comment symbol with awk or sed
How to remove comments and newline symbols without using two pipes.
I have bookmarks.txt file with comments.
https://cookies.com # recipes cookbook
https://magicwands.com # shopping
I can copy link ...
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1
answer
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views
sed inplace in selective block
I have a dir containing logstash config files
these files have filter blocks, and sometimes nested child blocks
need to match whole filter block
filter { any text till final matching closing brace for ...
- 2,009
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votes
5
answers
226
views
Perl or sed script to remove a specific content of a file from another bigger file
I have a file (FILE1) with some repeated sections as below (example):
LINE 1 ABCD
LINE 2 EFGA
LINE 3 HCJK
REMOVE LINE11
REMOVE LINE12
REMOVE LINE13
LINE 4 ABCDH
LINE 5 EFGAG
LINE 6 HCJKD
REMOVE ...
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3
answers
99
views
How to remove markdown links from headers with sed?
I'm trying to use sed to remove links like and leave just the title:
## [Some title](#some-title)
This is my command:
sed 's/^\(\#*\) *\[\([^\]]*\)\].*/\1 \2/'
I expect to have just the text without ...
- 10.4k
1
vote
6
answers
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views
Change a double quote into a single quote with gnu sed when the quotes come before and after a parenthesis?
I'm using Debian 12 bookworm, gnu sed. I have this
"Hello1"
"('41-Z', 5001, 'A6')"
"'Hello2'"
"('42-Z', 5002, 'A7')"
'Hello3'
"('43-Z', 5003, 'A8')"
...
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1
vote
2
answers
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views
How to extract a sub-heading as string which is above a search for word
I'm new to Bash and I've been self-taught. I think I'm learning well, but I do have staggering gaps in my base knowledge. So sorry if this is woefully simple bbuuuttt...
Essentially, I need to sift ...
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3
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356
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How to delete lines with sed if they contain a phrase?
I tried this
sed -i '/^already satisfied$/d' loggocd.txt
but lines like this one
Requirement already satisfied: cryptography in /home/go/.pyenv/versions/3.9.1/lib/python3.9/site-packages
are not ...
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