8.3 Programming in M4sh
M4sh provides portable alternatives for some common shell constructs
that unfortunately are not portable in practice.
- Macro: AS_DIRNAME (pathname)
-
Return the directory portion of pathname, using the algorithm
required by POSIX. See section 10.9 Limitations of Usual Tools, for more
details about what this returns and why it is more portable than the
dirname
command.
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