What is the result of the following command sequences?

ls | wc -l
rm ???
who | wc -l
mv progs/* /users/steve/backup
ls *.c | wc -l
rm *.o
who | sort
cd; pwd
cp memo1 ..
plotdata 2>errors &

ls | wc -l
Shows how many files are in the current directory

rm ???
Removes any files that have exactly three character names

who | wc -l
Shows how many people are logged into the system

mv progs/* /users/steve/backup
Moves all files from progs into /users/steve/backup

ls *.c | wc -l
Shows how many C programs (files with a .c filename suffix) are in the current directory

rm *.o
Removes any files that have a .o filename suffix from the current directory

who | sort
Shows who is logged in, sorted in alphabetical order

cd; pwd
Changes to your default $HOME directory, and shows where you are in the file system

cp memo1 ..
Copies the file memo1 to the parent directory

plotdata 2>errors &
Runs the plotdata command in background, redirecting the stderr output to the file error