This question already has answers here:
Difference between single and double quotes in Bash
(7 answers)
Closed 6 months ago.
How to replace a string in a file by bash variable, please
I tried
i="1"
sed -i 's/%q/0$i/g' file
sed -i 's/%q/0"$i"/g' file
There is 0$i or 0"$i" in the file instead of 01. Thank you
Change your script as follow:
i="1"
sed -i "s/%q/0$i/g" file
sed -i "s/%q/0\"$i\"/g" file
and remember: the shell variables substitution does not happen inside single quotes. ;)
Related
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:
Difference between single and double quotes in Bash
(7 answers)
Closed 4 years ago.
I have an environment variable LIB_HOME=/etc/temp
In one of the config files, i'm trying to replace entire line using sed command as follows
sed -i '/lib.home=/c\lib.home=$LIB_HOME' myconfig.properties
Actual Output : lib.home=blablabla ===> lib.home=$LIB_HOME
Expected Output : lib.home=blablabla ===> lib.home=/etc/temp
Please help
Have you tried using double quotes?
sed -i '/lib.home=/c\lib.home=‘“$LIB_HOME”' myconfig.properties
This question already has answers here:
Difference between single and double quotes in Bash
(7 answers)
Closed 4 years ago.
I am having a problem while using the bash shell. Here is my linux command code:
for i in `cat linshi`;do sed -i '/$i/d' a.txt;done
The content of linshi is:
aa
bb
The content of a.txt is:
aa:wwersdf12314231234
bb:weorpius2345234523
cc:ertoiu230498234098
dd:234092834asdfkdfkg
I want to delete the first and the second row of a.txt.
But unlucky, I found '/$i/d' is not correct. And I have tried '/\$i/d' and '/"\"$id/', but they are fail again. Who can help me?
Variables aren't expanded inside single quotes, only double quotes.
for i in `cat linshi`; do sed -i "/$i/d" a.txt; done
That said, you could do the same thing with:
grep -vf linshi a.txt
Instead of using single quotes use double quotes. '' doesn't undergo any variable expansion however double quotes do.
This will work:
for i in $(cat linshi);do sed -i "/$i/d" a.txt;done
This question already has answers here:
How to use variables in a command in sed?
(4 answers)
Closed 6 years ago.
i would insert two variable in sed command:
sed -i '39,41 s/^#//' file
i would
sed -i '$LINE,$LINE_INCREMENTED s/^#//' file
but return this:
sed: -e expression #1, char 9: unknown command: `$'
Shell variables are not expanded when put inside single quotes, they are treated literally then.
Do:
sed -i "$LINE,$LINE_INCREMENTED"' s/^#//' file
Assuming the variables only contain digits.
As s/^#// part does not contain any shell expansion, putting double quotes over the full expression would do too, better readability:
sed -i "$LINE,$LINE_INCREMENTED s/^#//" file
drop the quotes for double quotes so environment variables are evaluated:
sed -i "$LINE,$LINE_INCREMENTED s/^#//" file
This question already has answers here:
sed substitution with Bash variables
(6 answers)
Closed 7 years ago.
How can I do this?
sed -i 's/wiki_host/$host_name/g' /root/bin/sync
It will replace wiki_host with the text $host_name.
But I want to replace it with the content of the variable..
I tried it with
sed -i 's/wiki_host/${host_name}/g' /root/bin/sync
It doesn't work either.
You need to use double quotes:
$ sed -i "s/wiki_host/${host_name}/g" /root/bin/sync
Your single quotes prevent the shell variable from being replaced with its contents.