This question already has answers here:
why sed replace + redirection deletes my file?
(3 answers)
Closed 7 years ago.
Let
CONFIG_FILE=${WWW_DIR}/${WORDPRESS_TEST_DIR}/wp-config.php
This doesn't work:
sed "${SED_ARG}" ${CONFIG_FILE} >| ${CONFIG_FILE}
(all I get is an empty file). It does not work either when I replace the variables with the actual path strings, nor when I escape the paths with ".
This does work:
sed "${SED_ARG}" ${CONFIG_FILE} >| wp-config.php
mv wp-config.php ${CONFIG_FILE}
so I would assume the sed call works just fine.
Strangely, this does work too:
echo TEST >| ${CONFIG_FILE}
so the sed part might be the problem after all. I am clueless. Any ideas?
The redirection opens the file for writing (not appending), which makes it a new empty file, before the sed command is executed.
You can use the -i flag of sed, to do an in place substitution:
sed -I "${SED_ARG}" "${CONFIG_FILE}"
I also put quotes around ${CONFIG_FILE} to avoid unexpected behavior if it contains any special characters.
Related
This question already has answers here:
Escape a string for a sed replace pattern
(17 answers)
Closed 3 months ago.
Is there a simpler way to replace a string with a variable literally that contains all complex characters without needing to do character escaping?
complex='~`!##$%^&*()-_=+\|]}{[;:/?.>,<\/*&\#/'
sed -i "s/secret\ =\ \".*/secret\ =\ \"$complex\"/g" ./file.txt
I already know that & \ and / are the problems. I can do all manner of cleaning with sed commands, but is there a simpler way? Is there a way I can literally make sed read that variable as is?
My work around for now is the following, but even this does not work with / properly ...
complex='~`!##$%^&*()-_=+\|]}{[;:/?.>,<\/*&\#/'
psk_bs="$(echo $complex | sed 's/\\/\\\\\\/g')"
psk_bs_amp="$(echo "$psk_bs" | sed 's/\&/\\&/g')"
psk_bs_amp_fs="$(echo "$psk_bs_amp" | sed 's,'/','\/',g')"
sed -i "s/secret\ =\ \".*/secret\ =\ \"$psk_bs_amp_fs\"/g" ./file.txt
I can do all manner of cleaning with sed commands, but is there a simpler way? Is there a way I can literally make sed read that variable as is?
I'm afraid there is not. But character escaping is not as a big deal as you make it seem to be. This'll work just fine:
psk=$(sed 's/[/&\]/\\&/g' <<< $complex)
sed -i "s/secret = \".*/secret = \"$psk\"/g" ./file.txt
With bash 5.2 you don't even need sed for escaping:
psk=${complex//[\/&\\]/\\&}
This question already has answers here:
Using different delimiters in sed commands and range addresses
(3 answers)
Closed 12 months ago.
I've a script
#!/bin/bash
mv /home/nnice/Downloads/Images/* /run/media/nnice/New\ Volume/FILES/Softwares/HTTP/Downloads/Images
mv /home/nnice/Downloads/Video/* /run/media/nnice/New\ Volume/FILES/Softwares/HTTP/Downloads/Videos
I need to replace path using sed command. I've stored paths in variables
replace="/run/media/nnice/New\ Volume/FILES/Softwares/HTTP/Downloads/"
replacewith="/home/nnice/Windows/D/FILES/Softwares/HTTP/Downloads/"
I am trying following command but it doesn't work
sed -i "s/$replace/$replacewith/g" script.sh
I've also used different separators instead of / but script remains unchanged.
[nnice#myhost scripts]$ sed "s|$replace|$replacewith|g" script.sh
#!/bin/bash
mv /home/nnice/Downloads/Images/* /run/media/nnice/New\ Volume/FILES/Softwares/HTTP/Downloads/Images
mv /home/nnice/Downloads/Video/* /run/media/nnice/New\ Volume/FILES/Softwares/HTTP/Downloads/Videos
can you please help me with that to replace them using sed command?
Thank you
Your command fails because you're using the same separator for the sed command and your file paths. File paths need to use / but sed separators can be anything, so try this:
sed -i "s#$replace#$replacewith#g" script.sh
This question already has answers here:
How to pass a variable containing slashes to sed
(7 answers)
Closed 2 years ago.
I'm writing a bash script where I need to replace text in a file with a specific file path, but my understanding is that sed does not work with specific characters such as /. I'm wondering if there is some way around this?
Here is my script currently:
currentdir="$PWD"
filepathvar="${currentdir}/settings.ini"
sed -i -e "s/filepath/$filepathvar/g" aimparmstest
When I print out filepathvar everything is as I expect it to be, but it seems the fact that filepathvar contains special characters, it gives me the following error:
sed: -e expression #1, char 13: unknown option to `s'
Is there any way around this? Or perhaps another command I can use? I haven't had any success with changing around the parameters. Any help is greatly appreciated.
You can use any character as the separator (the first character). For example:
echo "a/b/c" | sed -e 's|/|_|g'
In your case:
sed -i -e "s|filepath|$filepathvar|g" aimparmstest
This question already has answers here:
What is the difference between `sed -i -e` and `sed -ie`?
(2 answers)
Closed 2 years ago.
I need to change some words in bulk, but because of the brackets inside it, I think I do something wrong.
Line that needs to be changed
echo "CMD_PLUGINS_ADMIN/admin/index.html";
I need to change it to this:
echo "CMD_PLUGINS_ADMIN/reseller/index.html";
I tried it with: sed -ie 's/admin/reseller/' *
But does not change anything, I hope someone knows the right command for it.
$ echo '"CMD_PLUGINS_ADMIN/admin/index.html";' | sed 's/\/admin\//\/reseller\//g'
"CMD_PLUGINS_ADMIN/reseller/index.html";
your input has slash and you are using slash as sed seperator
Either escape the slashes in input by preceeding them with backslash:
echo '"CMD_PLUGINS_ADMIN/admin/index.html";' | sed 's/\/admin\//\/reseller\//g'
"CMD_PLUGINS_ADMIN/reseller/index.html";
OR change seperator to any other like pipe:
echo '"CMD_PLUGINS_ADMIN/admin/index.html";' | sed 's|admin|reseller|g'
"CMD_PLUGINS_ADMIN/reseller/index.html";
This question already has answers here:
Using different delimiters in sed commands and range addresses
(3 answers)
Closed 5 years ago.
File: abc.properties
tomcat.home=/opt/tomcat
Set to /usr/local/tomcat. Following cmd is working.
sed -i "/tomcat.home=/ s/=.*/="usr\\/local\\/tomcat"/" abc.properties
Set to $WORKSPACE/tomcat. Following cmd is NOT working since value of the $WORKSPACE is having / delimeters.
sed -i "/tomcat.home=/ s/=.*/="$WORKSPACE\\/tomcat"/" abc.properties
Anyone has an idea how to success above cmd.
Thank you and appreciate your support...
Sed lets you use any character you want as the delimiter. Whatever follows the s is used as the separator:
sed -Ee 's/foo/bar/'
sed -Ee 's|foo|bar|'
sed -Ee 's#foo#bar#'
^- All of those are equivalent.
The other option is to escape all your / as \/, but that gets nightmarish fast. Prefer to just pick a separator character that doesn't collide with characters you're trying to use for something else.