compgen -c | sort -b | uniq | less
Shows also functions and keywords (luckily no aliases), I instead want all that are not keywords, functions or aliases. In few words only the commands.
If command name match with function name, keyword name or alias name; the command name must not be omitted.
For compgen (and I think for Linux in general), a command is everything that you can run including alias' and functions, etc.
If you want to get only executable files/scripts in any of your $PATH directories, there is no good way using compgen.
You could use comm to show all commands excluding aliases, keywords and functions:
comm -23
<(compgen -c | sort -u)
<(compgen -akA function | sort -u)
However, this will also remove commands that are both alias/function and command (e.g. ls or grep have an alias per default in Ubuntu, as well as anything you added yourself).
So, I think you're better off getting all executables from $PATH with your own script (and if you wish you can add builtins using compgen -b):
path_filenames(){
printf '%s' "$PATH"
| xargs -d: -I{} -- find -L {} -maxdepth 1 -executable -type f -printf '%P
' 2>/dev/null
}
sort -u <(path_filenames) <(compgen -b)
