I want to add some text on a line:
sudo sed -i '5imytext 16/16' /file
Now I've added mytext 16/16 on line 5 of the file, but I actually want to add the text 'mytext' 16/16 (mytext between single quotes).
I tried
sudo sed -i '5i'mytext' 16/16' /file
but it didn't work. Can someone help me?
The single quotes that you're trying to use in your insertion string are interfering with the ones around the sed command.
The simplest thing to do is to use different quotes around your sed command:
"5i'mytext' 16/16"
Normally it's best to use single quotes around a sed command but it would be more tricky in this case:
'5i'"'"'mytext'"'"' 16/16'
Basically, you need to put the single quotes inside double quotes somehow and in this case there's no reason not to double quote the whole command.
As suggested by 123 in the comments, an alternative would be to put your sed command into a script file:
5i'mytext' 16/16
Then use the -f switch to sed:
sed -f script
This avoids the need to use two kinds of quotes.
Use double quote in these cases. Because:
Single quote can't have single quote inside it. ('\'' won't work)
Double quote can have both single quote and double quote inside it. ("'\"" will work)
Example:
sudo sed -i "5i'mytext' 16/16" /file
You could use double quotes around your sed command, but that won't help you if you also need to insert double quotes. An alternative would be to use: \x27
Example: echo a|sed 's/a/\x27/' ➡ '
Related
in jenkins-pipeline, I'm trying to use SED to append the following line to the end of a file.
sh "sed -i '\$ s/\$/ public_file=\\/var\\/lib\\/jenkins\\/workspace\\/test-project\\ ansible_ssh_common_args='-o StrictHostKeyChecking=no' /' file.txt"
but I can't figure out how to escape the below line in my Jenkins file to make it work.
ansible_ssh_common_args='-o StrictHostKeyChecking=no'
I've already tried the following, which works in katacoda playground, but not in jenkins pipeline.
'"'"'-o StrictHostKeyChecking=no'"'"' /' file.txt
use " to wrap sed command, then you can use ' in command directly without to escape it.
use #, but / as delimiter for sed s command, then you no need to escape the / appeared in file path to make the whole commend more concise and readable.
sed -i "\$ s#\$# public_file=/var/lib/jenkins/workspace/test-project ansible_ssh_common_args='-o StrictHostKeyChecking=no' #" file.txt
In bash, you cannot escape single quotes within single quotes.
See the bash manual page:
Enclosing characters in single quotes preserves the literal value of each character within the quotes. A single quote may not occur between single quotes, even when preceded by a backslash.
You can use double quotes instead; then escape them as needed. You can then use single quotes within them without further escaping.
I want to replace <lexicon uri="file://C:/image/png/grammars/custom/image-custom.lex?SWI.type=backup"/><lexicon uri="file://C:/image/jpg/grammars/custom/image-dot-custom.lex?SWI.type=backup"/> with null in multiple files.
The code is given below.
sed -i s|<lexicon uri="file://C:/image/png/grammars/custom/image-custom.lex?SWI.type=backup"/><lexicon uri="file://C:/image/jpg/grammars/custom/image-dot-custom.lex?SWI.type=backup"/>||g *
Here I am getting this error:
< was unexpected at this time.
Please clarify for me what is not working here.
Could you please try following and let me know if this helps you. By using # as sed's separator you need not to escape / in it only need to escape ., ? not to take their special meaning
sed -E 's#<lexicon uri="file://C:/image/png/grammars/custom/image-custom\.lex\?SWI\.type=backup"/><lexicon uri="file://C:/image/jpg/grammars/custom/image-dot-custom\.lex\?SWI\.type=backup"/>##' Input_file
Tested it with:
sed --version
GNU sed version 4.2.1
works with #
sed -i -e 's#<lexicon uri="file://C:/image/png/grammars/custom/image-custom.lex?SWI.type=backup"/><lexicon uri="file://C:/image/jpg/grammars/custom/image-dot-custom.lex?SWI.type=backup"/>##g' test.txt
The pattern contains shell metacharacters, which need to be quoted or escaped. Usually, in Bash, you should use single quotes around strings, unless you need the shell to interpolate variables and command substitutions and interpret backslash sequences (in which case use double quotes) or to also perform whitespace tokenization and wildcard expansion (in which case use no quotes). See also When to wrap quotes around a shell variable?
sed -i 's|<lexicon uri="file://C:/image/png/grammars/custom/image-custom.lex?SWI.type=backup"/><lexicon uri="file://C:/image/jpg/grammars/custom/image-dot-custom.lex?SWI.type=backup"/>||' *
I also took out the g flag, which only makes sense if you expect multiple matches within a single line. (Perhaps you do after all, in which case obviously put it back.)
I'm trying to use the send command with a sed which uses a variable.
Having trouble to escape correctly.
send "sed "1i//$VAR" /file > /tmp/out\r"
If I use the sed command separately (which adds the $VAR text as first line of file), it works:
sed "1i//$VAR" /file > /tmp/out
But I can't figure out how to escape within the send command.
Inside double quotes, single quotes lose their special meaning, so you probably need:
send "sed '1i//$VAR' /file > /tmp/out\r"
On the local machine, the $VAR is placed into the command. On the remote machine, the sed command is enclosed in single quotes, protecting it from further abuse.
This should work:
send "sed '1i//$VAR' /file > /tmp/out\r"
Only the type of the outermost quotes matters for determining whether variables are interpolated.
I have an variable
qsubFile="submitJob.sh"
echo $qsubFile returns submitJob.sh without the double quotes.
Now, I want to find the line containing the string qsubFile="someOtherFile.sh" and replace it to qsubFile="submitJob.sh" in the file "write.sh".
I tried using
sed -i '/qsubFile=/c\qsubFile="'"$qsubFile"'"' write.sh
qsubFile=""
I can't seem to get the proper syntax for this.
but it replaces it as
You just need single quotes for sed to do this, there is no problem with the double quotes inside the single quotes:
sed -i 's/qsubFile="someOtherFile.sh"/qsubFile="submitJob.sh"/g' write.sh
If "someOtherFile.sh" isn't a fixed string in write.sh than use the follow to replace them all:
$ sed -i 's/qsubFile="[^"]*"/qsubFile="submitJob.sh"/g' write.sh
Regex "[^"]*":
" # double quote
[^"]* # Anything not a double quote
" # double quote
Seems I misread the question the first time the correct quoting is to use the variable $qsubFile is, you missed the last /:
sed -i 's/qsubFile="[^"]*"/qsubFile="'"$qsubFile"'"/g' write.sh
You're somewhat on the right track if you need to use the shell variable though.
sed -i 's/qsubFile="someOtherFile.sh"/qsubFile="'"$qsubfile"'"/g' write.sh
or if you want to make sure you get the whole line
sed -i 's/^\(qsubFile=\).*$/\1"'"$qsubfile"'"/g' write.sh
how can I use a variable as a pattern finder for sed? for example:
sed -i '/$pc/ s/off/on/' ~/Documents/Mantenimiento
I know there is a $ in between the '' but there gotta be a way! please help!
Use double quotes instead of single quotes, or close the quotes just before the variable and reopen them just after.
sed -i "/$pc/ s/off/on/"
sed -i '/'$pc'/ s/off/on/'
This will let bash perform the variable evaluation normally.