sed to replace string code example

Example 1: ubuntu command line replace word in files

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

Example 2: linux replace string in all files

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

Example 3: sed replace in file

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

Example 4: replace using sed

#on my mac
sed -i -e 's/old-text/new-text/g' text.txt

Example 5: sed replace number

Just use one of following commands for replacing a number of:
sed "s/[0-9]//" f.txt	#One single digit as 1
sed "s/[0-9]\+//" f.txt #Further digits as 837, specifying match repetition "\+"
sed "s/[0-9]\+\.[0-9]\+]//" file.txt #Float type with decimals

Example 6: sed replace from match

Just use a similar example with using ".*" regex with sed as following:
sed 's/match_pattern.*/replacement_of_match_and_rest_of_line/' file.txt