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Nor does it explain why this happens to patch-modified > files, but not to files modified via sed -i. I vaguely recall from several years ago a strange patch issue that I finally tracked down to environment variables used by patch to determine its temporary directory. From 'man patch': ENVIRONMENT [...] TMPDIR, TMP, TEMP Directory to put temporary files in; patch uses the first environ‐ ment variable in this list that is set. If none are set, the de‐ fault is system-dependent; it is normally /tmp on Unix hosts. Do you have any of those variables set to a value other than /tmp? Ken