In the realm of Linux terminal operations, a range of Linux commands are at our disposal for the purpose of effectively deleting or removing files.
When it comes to the task of file elimination, we commonly rely on the “rm” command, which swiftly erases files from the system. For enhanced security and assurance, the “shred” command comes into play, ensuring the thorough and secure deletion of a file, leaving no trace behind.
Furthermore, the “wipe” command offers an added layer of protection, securely erasing files beyond any possibility of recovery. In more complex scenarios or for advanced file deletion needs, we can turn to the secure deletion tools designed to meet the highest standards of secure file deletion.
With these powerful options at our disposal, we can confidently and effectively remove files from the Linux terminal environment.
We can use any of the above utilities to deal with relatively small files. What if we want to delete/remove a huge file/directory say about 100-200GB?
This may not be as easy as it seems, in terms of the time taken to remove the file (I/O scheduling) as well as the amount of RAM consumed while carrying out the operation.
In this tutorial, we will explain how to efficiently and reliably delete huge files/directories in Linux.
The main aim here is to use a technique that will not slow down the system while removing a huge file, resulting to reasonable I/O. We can achieve this using the ionice command.
Deleting HUGE (200GB) Files in Linux Using ionice Command
ionice is a useful program that sets or gets the I/O scheduling class and priority for another program. If no arguments or just -p is given, ionice will query the current I/O scheduling class and priority for that process.
If we give a command name such as rm command, it will run this command with the given arguments. To specify the process IDs of running processes for which to get or set the scheduling parameters, run this:
# ionice -p PID
To specify the name or number of the scheduling class to use (0 for none, 1 for real-time, 2 for best-effort, 3 for idle) the command below.
This means that rm will belong to the idle I/O class and only uses I/O when any other process does not need it:
---- Deleting Huge Files in Linux ----- # ionice -c 3 rm /var/logs/syslog # ionice -c 3 rm -rf /var/log/apache
If there won’t be much idle time on the system, then we may want to use the best-effort scheduling class and set a low priority like this:
# ionice -c 2 -n 6 rm /var/logs/syslog # ionice -c 2 -n 6 rm -rf /var/log/apache
Note: To delete huge files using a secure method, we may use the shred, wipe and various tools in the secure-deletion toolkit mentioned earlier on, instead of the rm command.
For more info, look through the ionice man page:
# man ionice
That’s it for now! What other methods do you have in mind for the above purpose? Use the comment section below to share with us.
