|  | Searchpath searches for the executable name in the same way that
    sh(1) and rc(1) do. 
    
    
    The environment variable $PATH is treated as a colon-separated
    list of directories in which to look for name. An empty string
    in the list is treated as the current directory. If an executable
    named name is found in one of the directories, searchpath returns
    a pointer to a malloced string containing a path (dir/name, or
    simply name) suitable for use in
    open(3) or exec(3). 
    
    
    If name begins with ./ , ../ , or / , then the search path is
    ignored. If name exists and is an executable, then searchpath
    returns a malloced string containing name. 
    
    
    The returned buffer should be freed when no longer needed. If
    name is not found, searchpath returns nil. |