fallocate:tldr:b1883

The command "fallocate --length ${700M} ${filename}" is used to allocate a specific amount of disk space for a file.

Let's break down the command:

• "fallocate" is a command-line utility in Unix-like operating systems (such as Linux) that allows one to manipulate disk space allocations.
• "--length" is an option that specifies the length or size of the file to be allocated.
• "${700M}" is a placeholder for the size of the file. In this case, it is set to 700 megabytes (M). You can replace this value with a different size as per your requirement. The "M" represents megabytes, and there are various other letters used to denote different sizes (e.g., "G" for gigabytes, "T" for terabytes).
• "${filename}" is a placeholder for the name of the file that will be created or allocated with the specified size.

For example, if you run the command "fallocate --length 700M myfile.txt," it will create a file named "myfile.txt" with a size of 700 megabytes.