All Questions
21
questions
32
votes
1
answer
9k
views
How to ensure that string interpolated into `sed` substitution escapes all metachars
I have a script that reads a text stream and generates a file of sed commands that is later run with sed -f. The generated sed commands are like:
s/cid:image002\.gif@01CC3D46\.926E77E0/https:\/\/...
- 4,097
415
votes
4
answers
774k
views
What characters do I need to escape when using sed in a sh script?
Take the following script:
#!/bin/sh
sed 's/(127\.0\.1\.1)\s/\1/' [some file]
If I try to run this in sh (dash here), it'll fail because of the parentheses, which need to be escaped. But I don't ...
- 5,220
19
votes
2
answers
94k
views
Passing a variable to sed [duplicate]
I cannot not use a shell variable in sed in the $NUMBER form. I have this line in my shell script:
cat shared.txt sed 's/whatever1/$2 ... whatever2/' > shared2.txt
The result in shared2.txt looks ...
- 375
13
votes
2
answers
5k
views
Why do I need to escape regex characters in sed to be interpreted as regex characters?
It seems e.g.
cat sed_data.txt | sed 's/\b[0-9]\{3\}\b/NUMBER/g'
that I must escape characters to form a regular expression. In this case I had to escape braces in order to be interpreted as a number ...
- 10.2k
2
votes
3
answers
11k
views
Using a reference to a bash string variable in sed
I'm a relative Linux novice. Suppose that I have a text file a.txt that contains the following text:
A
B
C
Now, if I want to change the text on line 2 (which contains B), I can use the following ...
- 17.1k
7
votes
1
answer
598
views
Variable in sed
I have a file that contains filenames with absolute path.
In the middle of that path, is a variable directory, whenever I hard code the variable part, it works fine, but when I replace it with the ...
- 73
5
votes
2
answers
20k
views
How to escape a single quote? [duplicate]
This works fine:
sed -i 's# @driver.find_element(:xpath, "//a\[contains(@href,##' temp_spec.rb
against a source of
@driver.find_element(:xpath, "//a[contains(@href,'change_district')]").click
I ...
- 42.5k
6
votes
1
answer
37k
views
How to use variables in sed command
I'm trying to run
sed -i "/$variable/c \$variable1' file.txt
But it's not displaying any change in the file: file.txt.
But the same command, with out the variables works fine:
sed -i "/variable/c \...
- 63
4
votes
5
answers
30k
views
How to use a shell variable inside sed's s command? [duplicate]
we know that we can get the value of a variable using $ sign:
x=3
echo $x
3
Is there other ways that we can use to get the value without using $ sign.
I'm asking this because $ sign is a special ...
- 9,006
4
votes
2
answers
20k
views
Escaping ' (single quote) in sed replace string [duplicate]
I have a script that I'm using to perform some iptables changes across servers. In the script I have a sed command to find a string and insert iptables rule before that line.
The problem I'm having ...
- 53
3
votes
4
answers
2k
views
Piping paths with different types of quotes for slash substitution
I would like to use sed to convert a path with backslashes to the same path with forward slashes:
E.g.
I would like to pipe \\path\to\file\ and obtain /path/to/file
None of the following commands ...
- 41.6k
81
votes
2
answers
266k
views
Slash and backslash in sed [duplicate]
I want to use sed to change a slash into a backslash and a slash, i.e. / -> \/. But it does not work. Here a small example:
#!/bin/bash
TEST=/etc/hallo
echo $TEST
echo $TEST | sed "s/hallo/bello/g"
...
- 1,417
45
votes
1
answer
52k
views
using sed with ampersand (&)
I'm using sed to find and replace patterns within SAS files I have rather than changing them individually. The problem is I am trying to replace macro variables and when I use the ampersand it is not ...
- 553
35
votes
4
answers
72k
views
find and replace with sed with slash in find and replace string
I want to change in file /var/www with /home/lokesh/www with sed command
sed -i 's///var//www///home//lokesh//www/g' lks.php
but this give error
sed: couldn't open file ww///home//lokesh//www/g: No ...
- 505
5
votes
2
answers
8k
views
Escaping blackslash in sed
I am trying to write a sed command to replace a line in a file. The sed replace required the current working directory, which starts making the command a bit messy because of the characters that need ...
- 153