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PDF (FR)
• Linux commands by cheatography (EN) (cheatography.com) (PDF)
  
• Basic Linux commands and editor vi/nano by geeksforgeeks (EN) (geeksforgeeks.org) (PDF)
  
• Linux classic commands by linuxconfig (EN) (linuxconfig.org) (PDF)
  
• Best of Linux commands by phoenixnap (EN) (phoenixnap.com) (PDF)
  

Pictures / Images (FR)
• Linux memento by linuxopssys (FR) (linuxopssys.com) (PNG)