There are a few ways by which you can clear RAM in Linux like from system monitor and htop. In this tutorial you will know how to clear the ram and cache using one command.
How to check how RAM info in terminal
To check the current state of RAM in terminal just type ‘free’ use -m switch to display output in megabytes.
free -mtotal used free shared buff/cache available Mem: 3760 2363 144 489 1252 669 Swap: 2047 1079 968
Command to clear the cache
To clear the cache type the command in terminal and it requires root permission.
free -m && sync && echo 3 > /proc/sys/vm/drop_caches && free -m total used free shared buff/cache available Mem: 3760 2363 144 489 1252 669 Swap: 2047 1079 968 bash: /proc/sys/vm/drop_caches: Permission denied
To run this command in root type
sudo sutotal used free shared buff/cache available Mem: 3760 2408 173 503 1178 610 Swap: 2047 1105 942 total used free shared buff/cache available Mem: 3760 2414 458 494 887 616 Swap: 2047 1105
It will show before and after effect of command.
How to make the command short
This command may look lengthy and hard to remember, to make it short follow the steps below.
Create a file with name free_ram we are using vim as a text editor you can use any of your choice.
vim free_ramAnd write the command in this file.
free -m && sync && echo 3 > /proc/sys/vm/drop_caches && free -m
save and exit.
Now give this file executable permissions
sudo chmod +x free_ramNow whenever you need to clear your cache or buffer or free some RAM just open this file as
./free_ramOpen this file inside root. Use sudo su to enter root.
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