deallocvt - Linux

Overview

deallocvt is a command used to deallocate a virtual terminal (VT), which is a text-based console on Linux systems. It is primarily used to reclaim memory and system resources when a VT is no longer needed, freeing up space for other processes or tasks.

Syntax

deallocvt [options] [vt number]

Options/Flags

| Option | Description | Default |
|—|—|—|
| -f | Force deallocation even if processes are still attached to the VT | No |

Examples

• Deallocate VT 5:

deallocvt 5

• Force deallocate VT 4:

deallocvt -f 4

Common Issues

• Error: VT is not attached to any processes: Ensure that the VT is not being actively used by any running processes. Close all programs and applications that may be connected to the VT before deallocation.
• Permission denied: Verify that you have sufficient permissions to deallocate the VT. Typically, only root users can deallocate VTs.

Integration

deallocvt can be combined with other commands to manage VTs effectively. For instance:

• Free all unused VTs:

ls /dev/tty[0-9]* | grep 'console' | xargs -r deallocvt

Related Commands

• chvt: Change to a specified VT.
• fgconsole: Bring the specified VT to the foreground.
• vlock: Lock the keyboard and screen of a VT.