vi editor commands

To locate instances of particular sets of characters (or strings), use the following commands.

/string       search forward for occurrence of string in text
?string      search backward for occurrence of string in text
n               move to next occurrence of search string
N              move to next occurrence of search string in opposite direction
u               undo
U              undo all the changes

Replace
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:%s/oldword/newword/g
:%s/^M//g                           ----  to replace control-m characters (press ctrl-v& ctrl-m )

look for special characters:
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:set list