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- suppress error messages that appear with zsh. According to unset(1p), 'unset -f' unsets a function. If the function was not previously defined, this is a no-op. This is similar for zsh, but there it emits a warning if the function was not previously defined. - avoid 'local' in functions sources from etc/bashrc. ksh does not support this. - use 'command' shell builtin instead of 'type'. Seems to be more consistent between shell flavours.