cat /proc (advanced)

The /proc filesystem

low risk

interactive breakdown — edit the command and press Explain

$

⚠ Risks & cautions

/proc/<pid>/environ and cmdline may contain secrets.
Writing to /proc/sys or /proc/sysrq-trigger changes the running kernel.

What it does

Kernel and process information: /proc/cpuinfo, /proc/meminfo, /proc/<pid>/status.

Examples

cat /proc/meminfo | headMemory · explain & risk-check →

cat /proc/1234/statusProcess status · explain & risk-check →

ls -l /proc/1234/fdOpen files · explain & risk-check →

Related

Open the full explainer →More in Debugging & Performance

Reference text is hand-written and may be incomplete — check man cat for your version. Test destructive commands on a non-production system first.