Create big files for testing purpose.
The "dd" command comes with the base installation.
Useful switches :
if == input file. By default, dd reads from standard input (stdin)
of == output file name
bs == block size of input & output
count == how many blocks to create for the output file, essentially the size of the file in megabytes
This would create a file with 100mb in size :
dd if=/dev/random of=myfile.dat bs=$(( 1024 * 1024 )) count=100
And this would create a file with 1000mb in size :
dd if=/dev/random of=myfile.dat bs=$(( 1024 * 1024 )) count=1000