Here’s another logging routine, this one is written in Bourne shell:
#!/bin/sh log_message() { echo `date "+%m/%d/%y %H:%M:%S %Z"` "$1" | tee -a aaa.out } log_message "Hello there" log_message "Goodbye"
Sample output:
08/28/07 23:16:13 EDT Hello there 08/28/07 23:16:13 EDT Goodbye
Here’s how to find out your external IP address courtesy of this hint:
http://www.macosxhints.com/article.php?story=20060602180942480
curl --silent http://checkip.dyndns.org | awk '{print $6}' | cut -f 1 -d "<"
If you are using Apple’s Airport Extreme Basestation (mine is particularly the Time Capsule and this is where I have tested this), and you have the SNMP interface enabled, you can run the following command
prompt$ snmpwalk -Os -c public -v 1 192.168.63.1 ipAdEntAddr IpAddress
| grep -E -v '(127.0.0|169.254|192.168.63.1)'
| cut -d : -f 2 | sed 's/ //g'
Line terminations for different operating systems:
| unix | 0x0a | LF |
| Classic Mac | 0x0d | CR |
| Windows | 0x0d 0x0a | CR LF |
To convert a text file with DOS line termination to UNIX line termination:
tr -d '15' unixfile.txt
or
sed s/.$// winfile.txt > unixfile.txt
To convert a unix file to a DOS file:
sed s/$/x0d/ unixfile.txt > winfile.txt
Mac OS X has to run some maintenance scripts in the middle of the night to do some important housekeeping tasks. If you have a Mac that sleeps in the middle of the night, as you do, you need to run these manually by running this from the shell:
sudo periodic daily weekly monthly
Starting with iTunes 4.5, Apple implemented those little grey arrows next to the song title, artist, and album, which will take you to the corresponding match in the iTunes Music Store. To change the behavior of these arrows so that instead of going to the store, it will take you to your library instead, you can do either one of two ways:
defaults write com.apple.iTunes invertStoreLinks -bool YES
Make sure iTunes is not running when you execute this command.