Sed replace

Linux replace string in all files

sed -i 's/old-text/new-text/g' input.txt

Sed replace in file

sed -i 's/foo/bar/g' hello.txt

Source: cyberciti.biz

Ubuntu command line replace word in files

sed -i 's/original/new/g' file.txt

Source: askubuntu.com

Sed replace all occurances?

echo dog dog dos | sed -e 's:dog:log:g'

#You can also use the above answer with appropriate slashes like
echo "grepper is a nice grepper" | sed "s/grepper/blow/g"

Source: stackoverflow.com

Sed replace with variable

Just concatenate var '"$var"' to replace values string in sed command:
$ sed -i 's/string_to_replace/'"$var"'/g' file_to_replace.txt

Sed replace

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'

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