Linux SED command in Bash script strips ' from string - linux

Question

I have been putting together a bash script and within it I need to update a file with some neccasary information. The command I am using is below:
sudo sed '
/end/ a\
First line to update\
param 1 'var1'\
param 2 'var2'\
param 3 'var3'\
param 4 'var4'\
end\
' TestFile >TestFileNew
Now this should update the file with the data and should look like this:
end
First line to update
param 1 'var1'
param 2 'var2'
param 3 'var3'
param 4 'var4'
end
The file does get created and the data is in it however it seems to strip the ' symbols from the text and I don't want this to happen, can anyone please help?? An example of what is actually getting produced is below:
end
First line to update
param 1 var1
param 2 var2
param 3 var3
param 4 var4
end

Answer 1

Use "" as the outer quotes:
sudo sed "
/end/ a\\
First line to update\\
param 1 'var1'\\
param 2 'var2'\\
param 3 'var3'\\
param 4 'var4'\\
end\\
" TestFile >TestFileNew

Answer 2

Looks like Igor has already provided an answer that may work for the single quotes.
Regarding the file creation, remember that sudo affects the program (sed) you're running as its option. It does not affect redirection, which is handled by your shell. So if you don't have permission as a user to write TestFileNew, sudo won't help you, the way you're using it above.
You might be better off creating your output somewhere else, then using sudo to move it into place.
sudo sed "/end/ ..." TestFile > /tmp/TestFileNew
sudo mv /tmp/TestFileNew ./TestFileNew
Alternately, this whole script could be run with sudo... I.e. /path/to/myscript is:
#!/bin/bash
sed "/end/ ..." TestFile > TestFileNew
then:
$ sudo /path/to/myscript
Then sudo is running bash instead of sed, and the privileged bash instance is responsible for handling redirection within the script.

Answer 3

In this case, it would probably be simpler to use sed's r command:
$ cat > /tmp/repl << EOF
First line to update
param 1 'var1'
param 2 'var2'
param 3 'var3'
param 4 'var4'
end
EOF
$ sed '/end/r/tmp/repl' TestFile
$ rm /tmp/repl
(I've ignored the sudo/redirect issue, but you probably want to so sudo sh -c 'sed /end/r/tmp/repl/ TestFile > TestFileNew'

Answer 4

Sometimes you have to deal with two types of quotes (html and javascript, for example). Then it is very convenient to put sed commands in a script:
cat >FILE
end
cat >script.sed
/end/ a\
First line to update\
param 1 'var1'\
param 2 'var2'\
param 3 'var3'\
param 4 'var4'\
end
sed -f script.sed FILE
end
First line to update
param 1 'var1'
param 2 'var2'
param 3 'var3'
param 4 'var4'
end