Final test: Bash: text processing and scripts

Several correct answers

With no arguments, count.sh runs echo "Usage: count.sh DIR" >&2 and exit 2. What is true for a run with no arguments?

• A ./count.sh 2> err.txt shows the usage line on the screen.
• B ./count.sh > out.txt leaves out.txt empty.
• C echo $? right after the run prints 2.
• D ./count.sh > out.txt writes the usage line to out.txt.