"$X" ]; then # -n tests to see if the argument is non empty
echo "the variable X is not the empty string"
else
echo "empty!"
fi
</code>
http:... length
1
-d
there exists a directory whose name is operand
1
-f
there exists a file whose name is operand
1
-eq
the operands are integers and they are
ds ======
Common practice for inputing passwords is to read the text without displaying it on the screen. The UNIX Bourne shell does not have this functionality as a command, but a combination of commands will make this work.
The stty command sets numerous terminal pa... o restore the echoing, use stty echo. However, it is poor programming to make the assumption that echo
