variable $\{trick}

With variables, I like the ${var} form, with the curly brackets.

But sometimes I need $\var, and you cannot do $\{var} or ${\var}. 

It is a real pity that ${\var} doesn't work.

A variant that will work, is ${:-$\var}.
 
test.rc:

  DEFAULT = /dev/null
  VERBOSE = on

  var = "abc[def]h+ij"

  quoted_var = "${:-$\var}"

Run with: 

  procmail ./test.rc < /dev/null


Of course, this is never really needed, because you can allways 
append an empty () to the variable name in a regexp, to separate 
the variable name from the following text, even when not needed.

-- 
Grtz, Ruud

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