Esercitazione Bash

1) Write a script that creates five directories named calculation_?, where ? is a number. (mkdirs.sh)
2) Write a parent_script.sh that creates and executes the child_script.sh. Write a child_script.sh that prints out numbers from 0 to 9
  (parent_script.sh, child_script.sh)
3) Create a "Hello world"-like script. Copy and alter your script to redirect output to a file using >. 
   Alter your script to use >> instead of >. What effect does this have on its behavior?
   (hello_world.sh, hello_world_redirect_1.sh,hello_world_redirect_2.sh)
4) Use seq 1 75 > numbers.txt to generate a file containing a list of numbers. 
   Use less and more commands to look inside it,
   then use grep to search for a certain number (e.g. 9).
   Use a wc to get an exact the number of lines in the file.
   (generaz_num.sh)