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# Basic listing ls ls /usr/local/bin # Long format — permissions, size, date ls -l # -rw-r--r-- 1 alice alice 4096 Apr 10 09:22 notes.txt # Long format + human-readable sizes + hidden files ls -lah # Sort by modification time (newest first) ls -lt # Sort by size (largest first) ls -lS # Reverse sort (oldest or smallest first) ls -ltr # List only directories ls -d */ # Colorised output (usually default on modern distros) ls --color=auto # ---- tree ---- # Install if needed: sudo apt install tree # Show full tree from current directory tree # Limit to 2 levels deep tree -L 2 # Show hidden files tree -a # Show sizes tree -sh # Ignore specific directories tree -I 'node_modules|.git|__pycache__' # Print only directories tree -d
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