"$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 scr... o restore the echoing, use stty echo. However, it is poor programming to make the assumption that echo is on. In some cases, echoing of characters is done at the local terminal (in which case we cannot preve
