fish-shell/doc_src/eval.txt

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\section eval eval - eval the specified commands
\subsection eval-synopsis Synopsis
<tt>eval [COMMANDS...]</tt>
\subsection eval-description Description
The <tt>eval</tt> builtin causes fish to evaluate the specified parameters as a command. If more than one parameter is specified, all parameters will be joined using a space character as a separator.
\subsection eval-example Example
<pre>
set cmd ls
eval $cmd
</pre>
will call the ls command.