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Upeksha Wisidagama

Procps Procfs Tools

Procps-3.2.8 Tools

procps is the package that has a bunch of small useful utilities that give information about processes using the /proc filesystem.

procps logo

procps includes the programs ps, top, vmstat, w, kill, free, slabtop, and skill.

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Procps New Generation (procps-ng)

procps-ng is the Debian, Fedora and openSUSE fork of procps.

From their NEWS page,

‘From procps to procps-ng’
procps-3.2.8 --> procps-ng-3.3.0
Debian, Fedora and openSUSE fork of procps.

procps-3.2.7 --> procps-3.2.8

Did you notice the change in their versioning? See below, Eric BĂ©langer is asking about switching to procps-ng.

Switching to procps-ng?


What happened to the Warning?

Did you remember bad syntax warning, when you type ps -aux in old ps program.

Warning: bad ps syntax, perhaps a bogus ‘–’? See

This behavior is intended to aid in transitioning old scripts and habits. It is fragile, subject to change, and thus should not be relied upon.

-man ps

Now this warning has been removed. You no longer get a warning.

ps-aux warning removed

I built a GNU Linux System from Scratch, I used Procps-ng-3.3.6. I don’t get this warning anymore. Did you still get this warning?

Proc File System

The proc filesystem provides a method of communication between kernel space and user space.

User Space - Kernel Space Bridge

User space(see left) and Kernel Space(see right) are bridged using proc file system. Proc file system belongs to Kernel Space.

User space creatures can read the proc files. Sometime there are writable proc files that can be used to control the Kernel.

cat /proc/sys/net/ipv4/ip_forward

echo “1” > /proc/sys/net/ipv4/ip_forward

Controls whether the kernel will allow tcp forwarding. The default value is 0 which means forwarding is OFF.You can set this to 1 if you with to enable it.

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