Let's use the command find find files that are smaller, equals or bigger than a specific size. The command find is already inside Linux so you shouldn't have to install anything.
find will only need three arguments, the path, a type and the size.
The path is pretty obvious. The type, simply use f to specify it's a file. For the size is a little bit different.
(absence of symbol) reprensents that we want to find file of a specific size. + (plus symbol) means that we want to find files that are bigger than the specified size. - (minus symbol) means that we want to find files that are smaller than the specified size.
b for 512-byte block (default) c for bytes (aka characters) w for 2-bytes (aka word) k for Kilobytes M for Megabytes (note: the capital M) G for Gigabytes (note: the capital G)
Let's find all the files that have less than 100 characters, in the current directory
find . -type f -size -100c
Let's find all the files that are more than 1 Megabyte in /usr
find /usr -type f -size +1M
Let's find all the files that are exactly 500 kilobytes in the whole system
find / -type f -size 500k
To delete all the found files, simply add the delete flag in the command. I would suggest that you find the files you want first without using the delete flag, just in case you do a mistake
When you are ready, simply add the delete flag
find . -type f -size -283c find . -type f -size -283c -delete