$EUID  –  Effective User ID

$EUID contains the effective user ID of the shell process.

With the sufficient permissions, a change to this variable will change the effective user ID of the shell process. Use a subshell to launch a command with a different effective user ID: (EUID=0; command).

Links

• The Z Shell manual

Examples

Change effective user ID of the shell process to 0 without sufficient permissions

1

EUID=0

Output:

1	zsh: failed to change effective user ID: permission denied