cli

I can never remember the path to the hosts file on my MacBook Pro. So, here it is:
sudo nano /private/etc/hosts

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To find what flavor of Linux you’re using:
cat /etc/*-release
To find the version, use:
uname -a

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This doesn’t work perfectly, but I often use it to start tracking down disk hogs:
To return the 10 largest items in a given directory:
du -cksh * |sort -rn |head -11
Some times it’s helpful to view all
du -cksh * |sort -rn
If someone has a better approach, please comment.

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Looking for a log to show you failed login attempts to your Linux machine? Look in:
/var/log/btmp
You can access it by running:
/usr/bin/lastb
It’s similiar to the wtmp log of user login/logouts and the utmp log showing who is currently logged in.

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I use wget all the time on my Linux machines, but was surprised to find it missing on my MacBook Pro. Since Mac OS is based on BSD, it uses cURL instead. Here’s a good way to scrape files from a remote server.
curl -O http://www.gutenberg.org/files/21171/mp3/21171-[01-24].mp3
Man page is available at: http://curl.haxx.se/docs/manpage.html

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After a few months of continuous use, I’ve found Ensim to start using too much swap space and getting sluggish. A quick restart via command line, always fixes both:
/etc/init.d/epld restart

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find /somedir -type f -size +50000k -mtime +1095 -exec ls -lh {} \; | awk ‘{ print  $6 “/” $8 ” ” $9 $10  $11 “: ” $5 }’

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I occasionally get this error when trying to run a heyu command from CLI. This should fix your problem:
(As root)
chmod 777 /dev/ttyS0

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