Linux is a multitasking operating system, which means that more than one task can be active at once. To find out what tasks are running on your system concurrently, use the command:
ps -f
UID PID PPID STIME TTY TIME COMD
hermie 24 1 00:35:28 tty1 0:01 bash
hermie 137 24 00:36:39 tty1 0:00 ps -f
I remember being confused for a very long time about the trailing garbage in commands I saw in Unix systems, especially while watching compilers do their work. Nobody I asked could tell me what the funny greater-thans, ampersands and numbers after the commands meant, and search engines never turned up anything but examples of it being used without explanation. In this article I’ll explain those weird commands.
Here’s an example command:
command > /dev/null 2>&1
Apple systems have always used different key combinations to perform different tasks, just like all computer makers. However, finding those key combinations has always been an arduous task – they don’t come right out and tell you in the manual how to do some of these.
This list is a culmination of scouring the net and the list of sites visited is huge, the most simple way to find these combinations is using a Google search, click HERE to perform the same search I did to get started. I visited about 30 web pages and gleaned information from many to assemble this list. :>)
