|  df (disk filesystem) | 
#  rm -r mydir (Remove Full Directory) | 
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|  du   (Disk Usage) | 
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| lsblk | 
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grep -Ril "text-to-find-here" /  | 
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i stands for ignore case (optional in your case). 
R stands for recursive. 
l stands for "show the file name, not the result itself". 
/ stands for starting at the root of your machine. 
 
 
 
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#  update-alternatives --config editor | 
select a editor you want | 
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|  Ping with timestamp | 
#  ping www.google.com | while read pong; do echo "$(date): $pong"; done | 
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| Das ganze System in allen Dateien nach einem bestimmten String durchsuchen | 
#  find . -type f -exec grep -il "String" {} \; | 
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