If you take an email address like my iCloud account, it’s krypted@me.com. If I take the username and add a + at the end I can then type some characters and put it all in front of the @ and domain name then the mail will still come to me. So, let’s say I use it to create an AppleID for an APNS certificate. That would be: krypted+apns@mac.com Or iTunes: krypted+itunes@mac.com Or iPhone1 (or these days iPad1): krypted+ipad1@mac.com The only gotcha is that occasionally you’ll run into some field on a webpage that has input validation for non alpha-numeric characters. Shouldn’t be the case, but it comes up from time…
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The basics of cron
The cron command has officially been deprecated in Mac OS X, but still functions if called upon. cron starts a process that executes commands at specified dates and times. Regularly scheduled commands can be specified according to instructions found in the crontab files in the directory /var/spool/cron/crontabs. Users can submit their own crontab files via the crontab command. Crontab copies the specified file or standard input if no file is specified, into a directory that holds all users’ crontabs. crontab options: The -e option edits a copy of the current users’ crontab file or creates an empty file to edit if crontab does not exist. The-r option removes a user’s…
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Where are my LDAP schema files?
/etc/ldap/schema
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Logging Sudo Events
Someone asked me the other day how to setup OS X to log sudo events. Well, there’s nothing to do. Whether the password used with sudo is right or wrong, all attempts to authenticate through sudo are logged.
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vnode
The vnode table represents all file activity in UNIX. There is a unique vnode allocated in the vnode table for each active file, each current directory, each mounted-on file, text file, and the root. To see the number of vnodes available in Mac OS X, look to sysctl for the kern.maxvnodes variable using something similar to the following command: sysctl -A | grep vnode
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Control SSH Access
Control access by editing the SSH configuration file and using the AllowUsers directive like so: AllowUsers cedge To add multiple entries, either separate users with a space: AllowUsers cedge kklein Or you can write an entirely new line: AllowUsers cedge AllowUsers kklein
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Logs
Where are all the logs in Mac OS X? Most of the important ones are in /var/log
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The Basics of pico (or nano)
At your Unix shell prompt, type: pico filename Replace filename with the name of the file you want to create or edit. For example, to create a file and name it indiana.txt, type: pico charles.txt If the file already exits, Pico opens it for you to edit. If it doesn’t exist yet, Pico creates it and places you in an editing buffer. Pico displays a menu bar of commonly-used commands at the bottom of the screen. Pico accepts commands from your keyboard but not from your mouse. To insert text into your Pico editing screen at the cursor, just begin typing. Pico inserts the text to the left of the…