(X)dialog: Pratende shells

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original in en Katja en Guido Socher 

en to nl Guus Snijders

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Katja is de Duitse editor van LinuxFocus. Ze houdt van Tux, film & fotografie en de zee. Haar homepage vindt je hier.

Guido is reeds lang een Linux fan en houdt van Linux omdat het is ontworpen door eerlijke, open mensen. Dit is een van de redenen waarom we het open source noemen. Zijn homepage bevindt zich op linuxfocus.org/~guido.

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Introductie

En daar is (X)dialog...

bash
Xdialog --yesno "Do you want to learn more about Xdialog?" 0 0;\
case $? in
0)
echo "Result: Yes chosen.";;
1)
echo "Result: No chosen.";;
255)
echo "ESC pressed.";;
esac

dialog --help
of
Xdialog --help

Hoe het werkt

dialog --yesno "tekst string" <hoogte> <breedte>

Echte applicaties

#!/bin/sh
#
#DIALOG=Xdialog
DIALOG=dialog
#
# name of your default isp:
defaultisp=maxnet
#
error()
{
    echo "$1"
    exit 2
}
help()
{
  cat <<HELP
pppdialout -- select an ISP and dial out.
All available ISPs must have a config file in /etc/ppp/peers

pppdialout executes the ppp-on/ppp-off scripts as described
in http://linuxfocus.org/English/March2001/article192.shtml

pppdialout, copyright gpl, http://linuxfocus.org/English/November2002
HELP
  exit 0
}

# parse command line:
while [ -n "$1" ]; do
case $1 in
    -h) help;shift 1;; # function help is called
    --) shift;break;; # end of options
    -*) echo "error: no such option $1. -h for help";exit 1;;
    *)  break;;
esac
done

tempfile=/tmp/pppdialout.$$
trap "rm -f $tempfile" 1 2 5 15

# check if we have a ppp network interface
if /sbin/ifconfig | grep '^ppp' > /dev/null; then
    # we are already online
    $DIALOG --title "go offline" --yesno "Click YES to \
                     terminate the ppp connection" 0 0
    rval="$?"
    clear 
    if [ "$rval" = "0" ]; then
        echo "running /etc/ppp/scripts/ppp-off ..."
        /etc/ppp/scripts/ppp-off
    fi
else
    # no ppp connection found, go online
    # get the names of all available ISP by listing /etc/ppp/peers
    for f in `ls /etc/ppp/peers`; do
        if [ -f "/etc/ppp/peers/$f" ]; then
            isplist="$isplist $f =="
        fi
    done
    [ -z "$isplist" ]&&error "No isp def found in /etc/ppp/peers"
    #
    $DIALOG --default-item "$defaultisp" --title "pppdialout"  \
         --menu "Please select one of\
    the following ISPs for dialout" 0 0 0 $isplist 2> $tempfile
    rval="$?" # return status, isp name will be in $tempfile
    clear
    if [ "$rval" = "0" ]; then
        isp=`cat $tempfile`
        echo "running /etc/ppp/scripts/ppp-on $isp..."  
        /etc/ppp/scripts/ppp-on "$isp"
    else
        echo "Cancel..."    
    fi
    rm -f $tempfile
fi
# end of pppdialout

dialog --menu "tekst" <hoogte> <breedte> <menu hoogte> <tag1> <beschrijving> ...

isp1 == isp2 == isp3 ==

... als aardige GTK GUI met Xdialog:




... met de curses gebaseerde dialog in de terminal:

Meer toepassingen

mktgz jouwpakket .

Conclusie

grep -i "eenstring" file.txt | sort | uniq | wc -l

Waar Xdialog en Dialog te verkrijgen?

Referenties

• Xdialog: http://www.chez.com/godefroy/
  dialog: http://hightek.org/dialog/
  
• Xdialog documentatie: http://www.chez.com/godefroy/doc/index.html
  
• Andere LinuxFocus artikelen:
  
  • Using different ISPs for your Internet access
    
  • Programmeren in de shell
    
• pppdialout script
• mktgz script

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