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<!DOCTYPE html>
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<div id="wb_element_instance1348" class="wb_element" style="left: 0px; top: 0px; width: 1000px; height: auto; min-width: 900px; min-height: 500px;padding-left: 200px ;padding-bottom: 50px; z-index: 299; ">
<h1 class="wb-stl-heading1">SYSTEM COMMANDS</h1>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">uname -a</span></p>
<p class="wb-stl-normal">Display linux system information </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">uname -r</span></p>
<p class="wb-stl-normal">Display kernel release information</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">last reboot</span></p>
<p class="wb-stl-normal">Show system reboot history</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">date</span></p>
<p class="wb-stl-normal">Show current date and time</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">cal</span></p>
<p class="wb-stl-normal">Show current month calendar4</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">whoami</span></p>
<p class="wb-stl-normal">Who you are logged in as </p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">finger user</span></p>
<p class="wb-stl-normal">Display information about user</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">cat /proc/cpuinfo</span></p>
<p class="wb-stl-normal">Show cpu info</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">cat /proc/meminfo</span> </p>
<p class="wb-stl-normal">Show memory information</p>
<p class="wb-stl-normal"><br>
</p>
<p class="wb-stl-normal"><span style="color:#f10631;">man command</span></p>
<p class="wb-stl-normal">Show manual for command</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">df</span></p>
<p class="wb-stl-normal">Check filesytem storage</p>
<p class="wb-stl-normal"><br>
</p>
<p class="wb-stl-normal"><span style="color:#f10631;">du</span></p>
<p class="wb-stl-normal">Check subdirectories</p>
<p class="wb-stl-normal"><br>
</p>
<p class="wb-stl-normal"><span style="color:#f10631;">df -h</span> </p>
<p class="wb-stl-normal">Shows file size which is user readable</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">du --max-depth=1 -h</span> </p>
<p class="wb-stl-normal">Check subdirectories by one level down</p>
<p class="wb-stl-normal"><br>
</p>
<p class="wb-stl-normal"><span style="color:#f10631;">whereis app</span></p>
<p class="wb-stl-normal">Show possible location of app</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">which app</span></p>
<p class="wb-stl-normal">Show which app will be run by default<br>
</p></br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">free</span> </p>
<p class="wb-stl-normal">To check ram & swap partition usuage</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">free -g</span></p>
<p class="wb-stl-normal">To see usuage in gigabytes</p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"> </p>
<h2>How to create swap file in linux?</h2>
<p class="wb-stl-normal"><span style="color:#f10631;">dd if=/dev/zero of=/swapfile bs=1024 count=1024</span></p>
<p class="wb-stl-normal">dd to create a storage file</p>
<p class="wb-stl-normal">if=/dev/zero : Read from /dev/zero file. /dev/zero is a special file,in that provides as many null characters to build storage file called /swapfile.<br>
of=/swapfile : Read from /dev/zero write storage file to /swapfile.<br>
bs=1024 : Read and write 1024 BYTES bytes at a time.<br>
count=1024 : Copy only 1024 BLOCKS input blocks.</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">mkswap /swapfile </span></p>
<p class="wb-stl-normal">To setup a linux swap area in a file.</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">swapon /swapfile</span><br>
Enable the swap file.</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p>
</br>
<p class="wb-stl-normal"><span style="color:#f10631;">swapoff /swapfile</span></p>
<p class="wb-stl-normal">Disable the swap file.</p>
<p class="wb-stl-normal">Determine the size of the new swap file in megabytes and multiply by 1024 to determine the number of blocks. For example, the block size of a 64 MB swap file is 65536. </p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">lvextend -l +100 /logical/volume00</span></p>
<p class="wb-stl-normal">Extend the logical volume 00 from blank space i.e. 0mb to volume 00 with 100 mb...</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">ctrl+alt+f1</span> </p>
<p class="wb-stl-normal">GUI (Graphical mode) to text mode i.e. CLI(Command Line Interface)</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">ctrl+alt+f7</span> </p>
<p class="wb-stl-normal">Text to graphic mode</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal">Types Of Boot Loader<br>
grub grand unified boot loader<br>
lilo linux bootloader<br><br>
</p>
<p class="wb-stl-normal"><span style="color:#f10631;">kcontrol &</span> </p>
<p class="wb-stl-normal">Configure the kde enviroment</p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"><span style="color:#f10631;">gnome-control-center</span> </p>
<p class="wb-stl-normal">Configure the gnome enviroment<br><br>
</p>
<p class="wb-stl-normal"><span style="color:#f10631;">switchdesk kde</span> </p>
<p class="wb-stl-normal">Set the default startup to kde</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">switchdesk gnome</span> </p>
<p class="wb-stl-normal">Set the default startup to gnome</p>
<p class="wb-stl-normal"> </p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">up2date-config</span> </p>
<p class="wb-stl-normal">Configure the red hat for update</p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">mount /dev/sda1 /tmpdir</span> mount the sda1 file in tmpdir directory<br><span style="color:#f10631;">mount /dev/sda0 /tmpdir</span> mount the sda0 file in tmpdir directory<br><span style="color:#f10631;">unmount /tmpdir/boot</span> unmount boot directory<br><span style="color:#f10631;">unmount /tmpdir</span> unmunt tmpdir directory<br>
</p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">sync</span></p>
<p class="wb-stl-normal">Sync the changed or changes take effect</p>
<p class="wb-stl-normal"><br>
</p>
<p class="wb-stl-normal"><span style="color:#f10631;">top</span> </p>
<p class="wb-stl-normal">Will show the running process list<br>
</p>
<p class="wb-stl-normal"> </p></br>
<p class="wb-stl-normal"><span style="color:#f10631;">gnome-system-monitor</span> </p>
<p class="wb-stl-normal">Show the graphical mode of running process<br><br>
</p>
<p class="wb-stl-normal"><span style="color: rgb(241, 6, 49);">uptime</span> </p>
<p class="wb-stl-normal">Show how long the system is running from last boot and <br>
load average of first no show the the total load in last one minute </p>
<p class="wb-stl-normal">load average of second no show the the total load in last five minute<br>
load average of third no show the the total load in last fifteen minute<br>
</p>
</div>
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