fish-shell/doc_src/alias.txt

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\section alias alias - create a function
\subsection alias-synopsis Synopsis
<pre>alias NAME DEFINITION
alias NAME=DEFINITION</pre>
\subsection alias-description Description
Alias is a shellscript wrapper around the function builtin.
It exists for backwards compatibility with Posix
shells. For other uses, it is recommended to define a <a
href='#function'>function</a>.
Alias does not keep track of which functions have been defined using
alias, nor does it allow erasing of aliases.
- NAME is the name of the function to define
- DEFINITION is the body of the function. The string " $argv" will be appended to the body.