mkdir "01 Classical Mechanics" cd "01 Classical Mechanics" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PL47F408D36D4CF129 cd .. mkdir "02 Quantum Mechanics" cd "02 Quantum Mechanics" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PL701CD168D02FF56F cd .. mkdir "03 Special Relativity and Electrodynamics" cd "03 Special Relativity and Electrodynamics" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PLD9DDFBDC338226CA cd .. mkdir "04 General Relativity" cd "04 General Relativity" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PLpGHT1n4-mAvcXwzOIz3dHnGZaQP1LEib cd .. mkdir "05 Cosmology" cd "05 Cosmology" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PLpGHT1n4-mAuVGJ2E1uF9GSwLsx7p1xtm cd .. mkdir "06 Statistical Mechanics" cd "06 Statistical Mechanics" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PLpi18tMShZSAQFNTb8Ji7EgCFP9lXbkOe cd .. mkdir "07 Advanced Quantum Mechanics" cd "07 Advanced Quantum Mechanics" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PLpGHT1n4-mAsmMxmSX0LCaXIXT2PmU85m cd .. mkdir "08 Higgs Boson" cd "08 Higgs Boson" youtube-dl -f "best[height<=480]" JqNg819PiZY cd .. mkdir "09 Quantum Entanglement" cd "09 Quantum Entanglement" youtube-dl -f "best[height<=480]" http://youtube.com/view_play_list?p=A27CEA1B8B27EB67 cd .. mkdir "10 Relativity" cd "10 Relativity" youtube-dl -f "best[height<=480]" http://youtube.com/view_play_list?p=5F9D6DB4231291BE cd .. mkdir "11 Particle Physics 1 Basic Concepts" cd "11 Particle Physics 1 Basic Concepts" youtube-dl -f "best[height<=480]" https://www.youtube.com/view_play_list?p=768E1383EA79C603 cd .. mkdir "12 Particle Physics 2 Standard Model" cd "12 Particle Physics 2 Standard Model" youtube-dl -f "best[height<=480]" https://www.youtube.com/view_play_list?p=8BCB4981DD1A0108 cd .. mkdir "13 Particle Physics 3 Supersymmetry and Grand Unification" cd "13 Particle Physics 3 Supersymmetry and Grand Unification" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PLpi18tMShZSBKLugjxRsN8U5MmILu1nBo cd .. mkdir "14 String Theory" cd "14 String Theory" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?p=A2FDCCBC7956448F cd .. mkdir "15 Cosmology and Black Holes" cd "15 Cosmology and Black Holes" youtube-dl -f "best[height<=480]" https://www.youtube.com/playlist?list=PL3E633552E58EB230 cd ..