PS -e|cut -d " " -fname|wc -l
Use the 'ps' command. This command lists all of the processes running on the system, when they started, who the owner is, etc.
The 'CD' command is not standard for Unix. The 'cd' command, however, will change directories (folders). It is a means of navigating the Unix file system.
Strace can be a valuable tool when debugging quirky behavior with running unix or Linux processes. It intercepts all signals that a process receives as well as all system calls the process makes. It can help one understand unusual or buggy behavior.
I don't believe there is a PS system call; however, there is a 'ps' command that is commonly used to show all (or a select few) processes running on the system and their resource utilization. It is also used so that users can terminate disconnected processes when they don't want them to run anymore.
Within the 'vi' editor, use the '!ps' command with the correct options, depending on the Unix version or variant.
ps -ef
PS -eaf|grep defunct
Use the command 'passwd'
Use the 'ifconfig' command to retrieve the addressing information and adapters on the system.
A "process" is a program. In multitasking environments such as Unix or Windows - in fact, in most modern operating systems - the computer can run multiple processes at the same time. Note that not all of such processes need to have a visible window - some can be hidden from the user, until you use a special tool or command to list the processes.
The 'ps' command will give you all the currently running processes. Each Unix system may have slightly different options to list them. The most common would be: ps -ed or ps -ef or ps -el depending on how much information you want to see.
Use the 'mkdir' command