https://biggi.dk/dokuwiki/ 2026-04-19T15:34:34+00:00 https://biggi.dk/dokuwiki/ https://biggi.dk/dokuwiki/lib/exe/fetch.php/wiki/dokuwiki.svg text/html 2015-08-15T20:56:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://biggi.dk/dokuwiki/doku.php/bash/one_liners/find_last_day_of_the_month?rev=1439672202&do=diff I needed to find the date of the last Sunday in the current month in relation to a backup script. This is the result: ncal -h 2>&1 | awk '/Su/ {print $(NF)}' Change “Su” to “Mo” “Tu” or any other day of the week to find the last of that day in the current month text/html 2015-08-15T20:56:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://biggi.dk/dokuwiki/doku.php/bash/one_liners/migrate_all_libvirt_machines_to_other_host?rev=1439672202&do=diff To migrate all running VPSes to another host, do the following: for x in `virsh list | grep running | awk {'print $2'}`; do echo "Migrating $x"; virsh migrate-setspeed $x --bandwidth 1000 && virsh migrate $x qemu+ssh://USERNAME@HOSTNAME/system; sleep 10; done text/html 2017-11-23T09:27:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://biggi.dk/dokuwiki/doku.php/bash/one_liners/mysql_queries_per_second?rev=1511429262&do=diff Oneliner: LASTVAL=0; CURRVAL=0; while true; do CURRVAL=`mysqladmin status | awk {'print $6'}`; echo "QPS: $((CURRVAL-LASTVAL))"; LASTVAL=$CURRVAL; sleep 1; done Output example: [root@thismachine ~]# LASTVAL=0; CURRVAL=0; while true; do CURRVAL=`mysqladmin status | awk {'print $6'}`; echo "QPS: $((CURRVAL-LASTVAL))"; LASTVAL=$CURRVAL; sleep 1; done QPS: 11429108706 QPS: 8047 QPS: 7783 QPS: 7909 QPS: 9965 QPS: 9835 ^C text/html 2015-08-15T20:56:42+00:00 Anonymous (anonymous@undisclosed.example.com) https://biggi.dk/dokuwiki/doku.php/bash/one_liners/ping_packet_loss?rev=1439672202&do=diff while true; do ping -c 10 8.8.8.8 | grep "packet loss"; sleep 1; done Example: biggi@box:~$ while true; do ping -c 10 8.8.8.8 | grep "packet loss"; sleep 1; done 10 packets transmitted, 10 received, 0% packet loss, time 9013ms 10 packets transmitted, 10 received, 0% packet loss, time 9010ms 10 packets transmitted, 10 received, 0% packet loss, time 9013ms ^C biggi@box:~$