vi / vim editor - beginner to advanced - options - search and replace
**Search whole file, replace globally (all occurrence/repetitions will be replaced)
:%s/FindMe/ReplaceMe/g
**Search current line only, replace globally on that line only.
:s/FindMe/ReplaceMe/g
**Search whole file, replace only first match
:%s/FindMe/ReplaceMe/
**Search current line only, replace first match only.
:s/FindMe/ReplaceMe/
**Search whole file, replace globally, with confirmation(c).
:%s/FindMe/ReplaceMe/gc
**Search whole file, replace globally, with confirmation(c), Case Sensitive(I) search.
:%s/FindMe/ReplaceMe/gcI
**Search whole file, replace globally, with confirmation(c), Case insensitive(i) search.
:%s/FindMe/ReplaceMe/gci