How to automatically escape characters in a string variable in shell?

Question

linux

Hello! Can you tell me the name of the utility that, having received a string as input, will give the same answer, but with escaped characters?
for example, I get a certain URI, conjure SED over it, respectively, the sed falls with an error.

Answer 1

Here's the solution that worked for me:

function sedeasy {
  sed -i "s/$(echo $1 | sed -e 's/\([[\/.*]\|\]\)/\\&/g')/$(echo $2 | sed -e 's/[\/&]/\\&/g')/g" $3
}

Answer 2

$ printf '%q\n' 'foo\bar? baz!'
foo\\bar\?\ baz\!