what file system is to be considered to check the disk space?
follow the instructions that is provided there clearly
how to resolve this issue
grep: df: No such file or directory
There is written “the commands to check the hard disk space available”, how to know which are storages for hard disk space from the output of "df " command? How to sum up them ?
You don’t have to consider the file system.Just locate the disk or block where the whole harddisk is mounted which is shown by “/”(Already indicated in the hint)