<quote> How to swap a column in Calc: Select column B Click anywhere in the highlighted area and drag the column. The mouse pointer should change to show the drag operation. Before you release the mouse button, also press the Alt key. When the mouse pointer is at the left side of column A, release the mouse button. Column B should be moved to the left of column A so that A and B are switched. </quote>

vi /path/to/message.sh #!/bin/bash PID=$(pgrep gnome-session) dbus=$(grep -z DBUS_SESSION_BUS_ADDRESS /proc/$PID/environ|cut -d= -f2-) export DBUS_SESSION_BUS_ADDRESS=$dbus notify-send -u critical "$1" crontab: `0 * * * * /path/to/message.sh "my message"`

vi /etc/systemd/system/mongodb.service [Unit] Description=High-performance, schema-free document-oriented database After=network.target [Service] User=mongodb ExecStart=/usr/bin/mongod --quiet --config /etc/mongod.conf [Install] WantedBy=multi-user.target `systemctl start mongodb` `systemctl enable mongodb` vi /etc/systemd/system/elastic.service [Unit] Description=Port forwarding for 9200 After=network.target [Service] User=javelin ExecStart=/usr/bin/ssh -NTC -o ServerAliveInterval=60 -o ExitOnForwardFailure=yes -o StrictHostKeyChecking=no -R 9201:15.0.33.22:9200 user@host.com RestartSec=3 Restart=always [Install] WantedBy=multi-user.target systemctl start elastic systemctl enable elastic https://blog.kylemanna.com/linux/ssh-reverse-tunnel-on-linux-with-systemd/

screen -ls screen -dmS mytabname php artisan dosomething screen -r mytabname detach: ctrl+a , d ls -laR /var/run/screen/

1. Install drivers (http://support.displaylink.com/knowledgebase/articles/684649-how-to-install-displaylink-software-on-ubuntu) 2. Disable secure boot 3. Create file: $ vi /usr/share/X11/xorg.conf.d/10-intel.conf Paste This: Section "Device" Identifier "Intel" Driver "intel" Option "VSync" "false" EndSection Best Solution: $ cat /etc/X11/xorg.conf.d/20-intel.conf Section "Device" Identifier "Intel Graphics" Driver "Intel" Option "AccelMethod" "sna" Option "TearFree" "true" Option "TripleBuffer" "true" Option "MigrationHeuristic" "greedy" Option "Tiling" "true" Option "Pageflip" "true" Option "ExaNoComposite" "false" Option "Tiling" "true" Option "Pageflip" "true" Option "VSync" "false" EndSection 4. Reboot 5. CPU decreasing compiz https://askubuntu.com/questions/689602/disable-all-visual-effects-in-ubuntu-15-10

Before installation mysite.com MX record points to mysite.com **Step 1** Need to do https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-postfix-on-ubuntu-16-04 **Step 2** Setup all, except ClamAV (if RAM is enough, ClamAV can be installed) https://help.ubuntu.com/community/PostfixAmavisNew How to siable ClamAV: # @\bypass_virus_checks_maps = ( # \%bypass_virus_checks, \@\bypass_virus_checks_acl, \$bypass_virus_checks_re); **Step 3** Instead Dovecot i prefer this https://help.ubuntu.com/community/PostfixBasicSetupHowto Installing courier IMAP and POP3 apt install courier-pop apt install courier-imap Then service courier-authdaemon start systemctl enable courier-authdaemon /etc/init.d/postfix restart **Step 4** Setup SPF https://www.digitalocean.com/community/tutorials/how-to-create-a-spf-record-for-your-domain-with-google-apps **Step 5** Setup DKIM https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy **Step 6** Setup DMARK https://habrahabr.ru/company/mailru/blog/170957/

tail /var/log/auth.log find . -type f -newermt 2017-01-01 ! -newermt 2017-01-31 grep -lr --include=*.php "base64_decode" grep -lr --include=*.php "@require"