1. uname command The uname command prints information about the system. uname is a portmanteau word made up from “unix” and “name”. uname can be called from the command line in Linux as, uname [OPTION]… The most common way to use uname is with the -a option, which stands for “all” the information. $ uname …
1.0 Sort The sort command is for sorting lines in text files. For example, if we have a file names, we can sort it with the sort command, $ cat names John Doe Jane Doe John Roe Richard Roe Tommy Atkins Max Mustermann Erika Mustermann Joe Bloggs $ $ sort names Erika Mustermann Jane Doe …
htop is a ncurses based program for viewing processes in a Linux system. htop gives visual indications about processor, memory and swap usage.
Linux daemons write log files. Left to itself, these log files would grow with time and take up the disk space. It is necessary to purge the log files periodically so that the disk space is conserved and is available for smooth running of the system. logrotate is a utility for rotation, compression, removal and …
The iostat command is for getting the CPU and input-output devices' statistics for Linux and Unix systems. For example, $ iostat Linux 3.0.0-14-generic (hostname) Wednesday 06 June 2012 _i686_ (2 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 17.38 0.13 3.13 1.63 0.00 77.74 Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 11.78 111.65 69.79 11663838 …
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 CPU activity. The most common command format is, vmstat [delay [count]] The optional delay parameter tells the time interval between periodic vmstat outputs. If the …
The uptime and w commands in Linux and Unix systems give pointed information about the system uptime, load average and about logged in users. uptime The uptime command is given as, uptime And the output is like, 07:47:08 up 25 days, 17:54, 1 user, load average: 0.03, 0.09, 0.08 In the above output, 07:47:08 is …
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 And the system responds with an output like, total used free shared buffers cached Mem: 960268 873136 87132 0 14652 168884 -/+ buffers/cache: 689600 270668 …
Finding the free and used memory with the free command Read More »
The Unix top command is useful for monitoring systems continuously for processes that take more system resources like the CPU time and the memory. top periodically updates the display showing the high resource consuming processes at the top. top is an excellent aid in checking a system. If your Linux or Unix system is giving …
The ps command gives information about processes on a Linux or Unix system. Our programs run as processes in the system. Also, for each installed package, there might be one or more processes. So, to know what is happening in the system, the first instinctive action is to find out about processes running in the …
