Writing a shell following this workshop materials.

• stage_1
• stage_2
• stage_3
• stage_4
• stage_5

Stage_1:

• Builtins: cd, help, exit, exec
• !, ;, &&, ||, \
• Subshell ( [cmd] )

Stage_2:

• Pipe |
• <, >, >>, <>
• <&, &> (not done yet!)

Stage_3: