NAME
add-shell - add shells to the list of valid login shells
SYNOPSIS
add-shell shellname [shellname...]
DESCRIPTION
add-shell copies /etc/shells to /etc/shells.tmp, adds the given shells to this file if they are not already present, and copies this temporary file back to /etc/shells.
The shells must be provided by their full pathnames.
ENVIRONMENT
DPKG_ROOT
specifies the base path under which /etc/shells resides.