Substitua o texto por sed
sed -i 's/old-text/new-text/g' input.txt
Clear Caterpillar
sed -i 's/old-text/new-text/g' input.txtsed -i 's/foo/bar/g' hello.txtJust concatenate var '"$var"' to replace values string in sed command:
$ sed -i 's/string_to_replace/'"$var"'/g' file_to_replace.txt#on my mac
sed -i -e 's/old-text/new-text/g' text.txtsed -i "s/$var1/ZZ/g" "$file"
For using match in sed replacement, just border it with '\(' and '\)':
echo Before123 | sed 's/Before\([0-9]*\)/\1After/g'
123After # number is matched withtin '\( \)' and replaced in '\1'
Example with 2 match replacements
echo a_b | sed 's/\(^.*\)_\(.*$\)/first is \1 and \2 is after/g'