Einstein - simple Shell scripts

Upload the following scripts to Einstein until you pass all the tests.

Scripts must use the names below.
(The names are clues!)

1. ls3.sh
   • List files ending in "html" in current directory.

2. ls4.sh
   • List files ending in "html" in all sub-directories of current directory.

3. ls5.sh
   • List files beginning with "act1" in all sub-directories of current directory and sort them by size.

4. du2.sh
   • List all directories below current directory and sort them by size.

5. find2.sh
   • Find all directories below the current directory that include the string "he".

6. grep4.sh
   • Search for the string "Dublin" in any case in all files ending in "html" in sub-directories of the current directory.