The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell , but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions , a history mechanism, and more. Security Fix: * zsh: Improper handling of shebang line longer than 64 For more details about the security issue, including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page listed in the References section. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.7 Release Notes linked from the References section.