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# free space in GB

df -B G

# dimension files and directory

du --max-depth=1 -h

# nano search editor

ctrl + W 

# show biggest files

find / -xdev -type f -size +100M -exec du -sh {} ';' | sort -rh | head -n50

# count numberl of files finish _graph in a folder

ls -F |grep  /*_graph | wc -l