Activity Monitor

The Jitzu shell includes a built-in full-screen activity monitor TUI, background job management, command timing, and process control commands.

The Monitor Command

Run monitor to open a live-updating full-screen dashboard showing:

CPU usage — overall percentage with per-core sparkline bars and gradient coloring (green through red)
Memory usage — used/total with sparkline graph
Network — send/receive rates with sparkline history
Disk usage — per-drive gauge bars
Process list — navigable tree view with PID, CPU%, memory, and command name

Monitor Controls

Key	Action
`q / Escape`	Quit the monitor
`Up / Down`	Navigate process list
`k`	Send SIGTERM to selected process
`kk` (double tap)	Send SIGKILL to selected process
`/`	Filter processes by name
`f`	Toggle: show only shell child processes

The monitor renders with bordered panels, gradient sparklines, and color-coded metrics. It refreshes automatically and adapts to terminal size changes.

Background Jobs

Append & to any command to run it in the background. The shell returns a job ID and process ID immediately, and the prompt stays responsive.

Shell

> dotnet build &
[1] 12345

> sleep 10 &
[2] 12346

Managing Jobs

Command	Description
`jobs`	List all background jobs with status (Running/Done)
`fg [%id]`	Bring a job to the foreground (waits for completion, shows output)
`bg`	List background jobs (alias for jobs)

Shell

> jobs
[1]  Running    dotnet build
[2]  Done       sleep 10

> fg %1
[1]  dotnet build
Build succeeded.
  0 Warning(s)
  0 Error(s)

Completed jobs are reported automatically at the next prompt. The prompt also shows the count of active background jobs (e.g. [2]).

Command Timing

Use time to measure how long a command takes to execute:

Shell

> time dotnet build
Build succeeded.

real    0m2.345s

Commands that take longer than 2 seconds also show their duration in the prompt line automatically (e.g. took 5s).

Watch

The watch command repeats a command at regular intervals. Press Ctrl+C to stop.

Shell

> watch -n 5 date
Every 5.0s: date

Sat Feb 14 14:23:00 2026

Default interval is 2 seconds. Use -n to specify a different interval.

Process Management

Command	Description
`kill [-9] pid`	Kill a process by PID or `%jobid`
`killall [-9] name`	Kill all processes matching a name

Shell

> kill %1
[1]  Terminated  dotnet build

> kill 12345
Process 12345 terminated.

> kill -9 12345
Process 12345 killed.

> killall node
Killed 3 process(es) named 'node'.

The -9 flag sends SIGKILL (force kill) instead of SIGTERM (graceful termination). Use %id to reference background jobs by their job ID.