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vim tips

I use the following selection substitute command for converting bash variables from $var to ${var}.

:'<,'>s#$\([^0-9(\{]\{1\}[^/{} '"()\\;.|`+*-]\+\)#${\1}#g

Here's that expression broken down.

:'<,'> - perform a task on a text selection in vim
s# - substitute using a hash as the expression delimiter
$ - just a plain old dollar sign with no special meaning in this context
  \( - BEGIN regex group
    [ - BEGIN character class
      ^0-9(\{ - the carat (^) states that NOT the following characters
    ]\{1\} - END character class and only one character (redundant I think)
    [ - BEGIN character class
      ^/{} '"()\\;.|`+*- - The carat at the beginning denotes NOT these characters.  The hyphen at the end is literal.
    ]\+ - END character class one or more characters
  \) - END regex group
#${\1}#g - replace expression to act globally on the line

Multi-file editing with :bufdo. e.g.

:bufdo %s/foo/bar/g

Auto-format blocks of text to 80 chars wide.

#select block of text
V
#format block of text
gq
#see also :help gq