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A comment on OpenBSD will shut down if we do not have the funding to keep the lights on. Parent comment
you could also have a look at HIST_FIND_NO_DUPS and HIST_IGNORE_ALL_DUPS (more options at http://zsh.sourceforge.net/Doc/Release/Options.html )
If you still use bash, now is a good time to upgrade to zsh
I'm a zsh user but am surprised that you guys are still using sourceforge instead of github.
you could also have a look at HIST_FIND_NO_DUPS and HIST_IGNORE_ALL_DUPS (more options at http://zsh.sourceforge.net/Doc/Release/Options.html )
If you still use bash, now is a good time to upgrade to zsh