" ]; 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://p...
Here's a quick list of test operators. It's by no means comprehensive, but its likely to be all you... oduces true if...
number of operands
-n
operand non zero length
1
-z
operand has zero length
1
-d
ying it on the screen. The UNIX Bourne shell does not have this functionality as a command, but a comb... numerous terminal parameters including whether or not characters should be echoed to the terminal. To ... nput (including commands typed at the shell) will not be echoed.
To restore the echoing, use stty ec... s done at the local terminal (in which case we cannot prevent echoing passwords) and the result of the
gefolgt von einem Dateinamen.
Falls die Datei noch nicht vorhaden war, wird sie automatisch angele... a Terminals oder Modems.
Die Bourne-Shell kann noch mehr: Man kann einen beliebigen Kommunikationsk... r Bourne-Shell lassen sich weitere Kanäle mit den normalen Umleitungsoperatoren öffnen; der Benutzer m