https://neil.mckillop.org/ 2026-04-25T18:17:49+0100 https://neil.mckillop.org/ https://neil.mckillop.org/lib/tpl/dokuwiki/images/favicon.ico text/html 2024-05-23T12:55:51+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/cli?rev=1716465351&do=diff Command Line Hacks Image metadata This shows me the EXIF time/date of every image in a directory, useful when I'm sorting: Needs the debian package 'exif'. for i in *; do echo $i; exif -t 0x0132 $i | grep Value; done; Xargs and Find Performing operations on multiple files using xargs and find: text/html 2020-01-07T16:34:39+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/dokuwiki?rev=1578414879&do=diff Dokuwiki I like the simplicity of this wiki. I've started to use it in a number of projects. Interwiki This is a useful feature that allows you to write shortcuts like Glasgow and have it directly link to the Wikipedia page. You can create your own custom shortcuts by adding them to the text/html 2020-04-20T00:34:24+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/grafana?rev=1587339264&do=diff Grafana Kilobytes per second From my load logger project I collect the number of bytes in/out of my network devices. If I want to graph that in grafana using my MySQL data source (as KB/s) then I have to use SQL to munge the numbers. This gets what I need in SQL: text/html 2021-08-12T12:58:55+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/linux?rev=1628769535&do=diff Linux Tweaks Timezone sudo timedatectl set-timezone Europe/London Revert window decorations Reverting window decorations in Ubuntu Lucid (moving the window buttons from the unintuitive left side, back to the right, restoring the context menu and reverting the order): text/html 2019-09-27T15:20:09+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/macos?rev=1569594009&do=diff Mac OS X Hackers Full path in Finder title bar Show full path in Finder title bar From the terminal type: defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES Then restart Finder with: killall Finder To reverse the change use: text/html 2020-04-11T14:22:01+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/passwordless_ssh?rev=1586611321&do=diff Passwordless SSH Check if you already have a public key ls .ssh/id_rsa.pub If not, generate one ssh-keygen -t rsa Make sure the .ssh directory exists on the remote host, then append the key to the authorized_keys file (from the client, to the remote host): text/html 2020-06-01T10:48:59+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/php?rev=1591004939&do=diff PHP Code Convert a British date Converting British dates to the ISO standard and back again. The very useful strtotime() function works on pretty much everything except the British date format. This function works around that. i.e. 31/01/2010 becomes 2010-01-31. With the 'reverse' parameter set to true it converts an ISO date to the British format (mainly for display purposes). text/html 2025-04-22T20:52:46+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/ssh?rev=1745351566&do=diff SSH Tunnels Bypassing firewalls If only HTTP (port 80) or HTTPS (port 443) is allowed out of the network. This is also useful for obfuscating traffic from your machine. You'll need to have server1 listening for ssh connections on port 80 or 443, we'll assume 443 here. From there you can create a SOCKS proxy using ssh. The '-g' parameter allows remote machines to share this proxy. text/html 2019-09-27T15:10:30+0100 Anonymous (anonymous@undisclosed.example.com) https://neil.mckillop.org/geek/vim?rev=1569593430&do=diff Vim Hacks Search&Replace n lines Search and replace over next n lines If I copy and paste code in a windows/putty environment it often replaces tabs with space characters and I'd prefer to change these back. For example, to replace spaces with a tab in the next 20 lines: