Plan 9 from Bell Labs’s /n/sources/patch/patchapply-write-perm/readme

Copyright © 2009 Alcatel-Lucent.
Distributed under the Lucent Public License version 1.02.
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Testing for write permission is done by rc write redirection (echo >.tmp). If it fails then commands intended for such condition will not be executed. Use touch(1) for that test instead.

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