Changes

:* Understand the process for '''planning ''' prior to writing a shell script.

:* Understand the purpose of a '''she-bang line ''' contained at the top of a shell script.

:* Setting '''permissions ''' for a shell script and properly '''execute ''' a shell script.

:* Understand and use '''environment ''' and '''user-defined ''''''Bold text''' variables within a shell script.

:* Understand the purpose of '''control flow statements ''' used with shell scripts.

:* Use the '''test ''' command to test various conditions.

:* Use the '''if ''' logic statement and the '''for ''' loop statement within shell scripts.