SHELL

command to check the free disk space

df

# To show values in human-readable format
df -h

# --total to output the total free space
df -h --total

command to check the amount of disk space used

du

# To specify a folder
du <folder>

# -h to print the sizes in human-readable format 
# -c to specify the grand total size

# for Example, displays the grand total in human readable format
du -hc 

# We can sort the output according to size
du -h | sort -h

# to check for the larger files
du -h | sort -h | tail
OR
du -h | sort -hr | head