address] s [/
Replace the first instance of pattern on each of the specified lines with replacement. If pattern and replacement are omitted, repeat last substitution. count specifies the number of lines on which to substitute, starting with address. See additional examples in Chapter 7.
Prompt for confirmation before each change.
Substitute all instances of pattern on each line (global).
Print the last line on which a substitution was made.
:1,10s/yes/no/gSubstitute on first 10 lines
:%s/[Hh]ello/Hi/gcConfirm global substitutions
:s/Fortran/\U&/ 3Uppercase "Fortran" on next three lines
:g/^[0-9][0-9]*/s//Line &:/For every line beginning with one or more digits, add "Line" and a colon