Re: Behavior change in ${...//...}

[Peter Stephenson <pws@csr.com>]

Danek Duvall wrote:
> Between 4.0.x and 4.1.1, the requirements to quote a "/" in the
> replacement part of a ${name//pattern/repl} expression changed from two
> backslashes to one.  The new syntax doesn't work in the old versions and
> vice versa.

See the README file for 4.0.7.


A change between 4.0.6 and 4.0.7 affects substitutions of the form
${foo/src/rep} and ${foo//src/rep}.  In 4.0.6, a literal `/' was quoted in
the `src' text with two backslashes.  This was documented, but inconsistent
with normal quoting conventions and poorly implemented.  The `/' now
requires only one backslash to quote it whether or not the expresion occurs
in double quotes.  For example:
  % foo=word/bird
  % print ${foo/\//-} "${foo/\//+}"
  word-bird word+bird
Note also the following workaround which is valid in all versions of the
shell that support this syntax:
  % slash=/
  % foo=word/bird
  % print ${foo/$slash/-} "${foo/$slash/+}"

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


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