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<concept xml:lang="en" id="GUID-7C645FF2-4785-5716-9674-B3A224F6C0D9"><title>emulate</title><prolog><metadata><keywords/></metadata></prolog><conbody><p><userinput>emulate [ -LR ] {zsh|sh|ksh|csh} </userinput> </p> <p>Set up <codeph>zsh</codeph> options to emulate the specified shell as much as possible. <codeph>csh</codeph> will never be fully emulated. If the argument is not one of the shells listed above, <codeph>zsh</codeph> will be used as a default; more precisely, the tests performed on the argument are the same as those used to determine the emulation at startup based on the shell name. </p> <table id="GUID-31105902-D4A1-5FDF-ACD8-860ABB0B7290"><tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/><thead><row><entry>Option</entry> <entry>Description</entry> </row> </thead> <tbody><row><entry><p> <codeph>-R</codeph>  </p> </entry> <entry><p>All options are reset to their default value corresponding to the specified emulation mode, except for certain options describing the interactive environment; otherwise, only those options likely to cause portability problems in scripts and functions are altered. </p> </entry> </row> <row><entry><p> <codeph>-L</codeph>  </p> </entry> <entry><p>The options <codeph>LOCAL_OPTIONS</codeph> will be set, causing the effects of the emulate command and any setopt and trap commands to be local to the immediately surrounding shell function, if any; normally these options are turned off in all emulation modes except <codeph>ksh</codeph>. </p> </entry> </row> </tbody> </tgroup> </table> </conbody></concept>