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* Fix up ?d() functionsTom Ryder2016-08-231-76/+0
| | | | | | Count arguments in right places; return 2 on usage errors where possible; minimise subshell activity; move directory replacement functionality to its own function `rd()` rather than overloading `cd`.
* Correctly bail from failed subshellTom Ryder2016-08-201-3/+3
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* Improve error handling of cd() a bitTom Ryder2016-08-201-17/+21
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* Change cd() into POSIX shell scriptTom Ryder2016-08-191-0/+72