Last checked against version &procps-contversion;. free displays the total amount of free and used physical and swap memory in the system, as well as the shared memory and buffers used by the kernel. kills sends signals to processes. ps gives a snapshot of the current processes. pgrep looks up processes based on name and other attributes. pkill signals processes based on name and other attributes. skill sends signals to process matching a criteria. snice changes the scheduling priority for process matching a criteria. sysctl modifies kernel parameters at runtime. tload prints a graph of the current system load average to the specified tty or, if none is specified, the tty of the tload process. top provides an ongoing look at processor activity in real time. vmstat reports information about processes, memory, paging, block IO, traps and cpu activity. w displays information about the users, and their processes, currently on the machine. watch runs command repeatedly, displaying its output (the first screen full). libproc is the library against which most of the programs in this set are linked to save disk space by implementing common functions only once.