My test:
<cjwatson@sarantium ~/src/ubuntu/exuberant-ctags/exuberant-ctags>$ etags gnu_regex/regex.c <cjwatson@sarantium ~/src/ubuntu/exuberant-ctags/exuberant-ctags>$ mv TAGS TAGS.safe <cjwatson@sarantium ~/src/ubuntu/exuberant-ctags/exuberant-ctags>$ etags ./gnu_regex/regex.c <cjwatson@sarantium ~/src/ubuntu/exuberant-ctags/exuberant-ctags>$ diff -u TAGS.safe TAGS <cjwatson@sarantium ~/src/ubuntu/exuberant-ctags/exuberant-ctags>$
My test:
<cjwatson@ sarantium ~/src/ubuntu/ exuberant- ctags/exuberant -ctags> $ etags gnu_regex/regex.c sarantium ~/src/ubuntu/ exuberant- ctags/exuberant -ctags> $ mv TAGS TAGS.safe sarantium ~/src/ubuntu/ exuberant- ctags/exuberant -ctags> $ etags ./gnu_regex/regex.c sarantium ~/src/ubuntu/ exuberant- ctags/exuberant -ctags> $ diff -u TAGS.safe TAGS sarantium ~/src/ubuntu/ exuberant- ctags/exuberant -ctags> $
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