tmpfs in Linux
1.0 tmpfs tmpfs is a filesystem that resides in the main memory of a Linux system. tmpfs stands for temporary file system. In the case of disk files, a file…
htop command in Linux
htop is a ncurses based program for viewing processes in a Linux system. htop gives visual indications about processor, memory and swap usage.
sar command in Linux
The sar command under Linux and Unix systems gives the system activity reports. As the system works, a record of activities is kept in certain counters in the kernel. The…
pidstat
The best way to use pidstat is to pass a list of process ids with the -p parameter. The -u option reports CPU utilization. The -l parameter displays the process…
vmstat
The vmstat command prints the system virtual memory statistics for Linux and Unix systems. vmstat prints information about system processes, memory, swap, I/O blocks, interrupts and context switches and the…
Finding the free and used memory with the free command
Using the free command, the free and used memory in a Linux or Unix system can be found. The free command can be given from the command line as, free…