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bin/ksh93 @exec echo "updating /etc/shells"; cp /etc/shells /etc/shells.bak; (grep -v %D/%F /etc/shells.bak; echo %D/%F) >/etc/shells @unexec echo "updating /etc/shells"; cp /etc/shells /etc/shells.bak; (grep -v %D/%F /etc/shells.bak) >/etc/shells