On 01/28/2011 11:28 AM, kellyremo wrote: > > http://pastebin.com/raw.php?i=rykHdvBh > > bix.hu and www.yahoo.com are "pingable" test sites. > 127.0.0.1 could not be pinged [firewall drops all icmp] > > i have a "oneliner" that echoes if theres "internet connection or no". > $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& > /dev/null && echo "internet connection ok" || echo "no internet connection" > internet connection ok > $ ping -W 1 -c 2 127.0.0.1 >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& > /dev/null && echo "internet connection ok" || echo "no internet connection" > no internet connection > $ ping -W 1 -c 2 127.0.0.1 >& /dev/null && ping -W 1 -c 2 127.0.0.1 >& /dev/null > && echo "internet connection ok" || echo "no internet connection" > no internet connection > $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 127.0.0.1 >& /dev/null && > echo "internet connection ok" || echo "no internet connection" > no internet connection > $ ping -W 1 -c 2 bix.hu >& /dev/null && ping -W 1 -c 2 www.yahoo.com >& > /dev/null && echo "internet connection ok" || echo "no internet connection" > internet connection ok > $ > > Ok! > > But: if i want the "oneliner" to only go along when theres internet connection: > $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 > www.yahoo.com >& /dev/null && TORF=false || TORF=true; done > $ while $TORF; do ping -W 1 -c 1 127.0.0.1 >& /dev/null && ping -W 1 -c 1 > www.yahoo.com >& /dev/null && TORF=false || TORF=true; done > $ while $TORF; do ping -W 1 -c 1 127.0.0.1 >& /dev/null && ping -W 1 -c 1 > 127.0.0.1 >& /dev/null && TORF=false || TORF=true; done > $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 127.0.0.1 > >& /dev/null && TORF=false || TORF=true; done > $ while $TORF; do ping -W 1 -c 1 bix.hu >& /dev/null && ping -W 1 -c 1 > www.yahoo.com >& /dev/null && TORF=false || TORF=true; done > $ > > It just doesn't work. > > Goal: if theres no internet connection, then the oneliner must loop until there > is internet connection. if theres internet connection the oneliner ends. > > what am i missing? > Instead of using a variable (that has funky scoping in shell) just make the && compound command the loop condition and place it in a subshell: while (! ping -W 1 -c 1 bix.hu && ! ping -W 1 -c 1 www.yahoo.com )&>/dev/null; do /bin/true ; done Or you can write the same as: while (! (ping -W 1 -c 1 bix.hu && ping -W 1 -c 1 www.yahoo.com))&>/dev/null; do /bin/true ; done It's probably not the best way to do it though - this little shell loop eats up fair bit of CPU time. Just putting a "sleep 1" instead of /bin/true makes the load barely noticable but if you're on a system that's using Network Manager then you could also look at the information provided by the nmcli tool to see if it would meet your requirements. Regards, Bryn. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
