What is on Your Mind?

cd .

true

:

[root ~]# for _sh in bash ksh mksh dash zsh; do 
  printf '%s: %s\n' "$_sh" "$("$_sh" -c 'type true')"
done 
bash: true is a shell builtin
ksh: true is a shell builtin
mksh: true is a shell builtin
dash: true is a shell builtin
zsh: true is a shell builtin

cd .

ls -d

echo -n "" > /path/to/emptyfile
printf "" > /path/to/emptyfile
touch /path/to/emptyfile

> /path/to/emptyfile

useless_function()
{
        : # Do nothing.
}