A reader writes in to report that Accuweather has changed their Web page layout and the shell script from Wicked Cool Shell Scripts that returns the weather forecast (script #63, weather.sh), is broken.
- Home
- / Linux Shell Script Programming (Page 11)
Linux Shell Script Programming
Nifty shell script of the day: calculating standard deviation
If you find yourself working on the command line and need to whip out a quick statistical analysis or two, you’ll be glad to know that Wicked Cool Shell Scripts fan Josh Kotecha has sent in a very nice little shell script that does just that using the scriptbc script included in the book.
Sneaky ls flags and bestcompress
Another hiccup in a script included in Wicked Cool Shell Scripts, one that’s a subtle problem because it sometimes occurs because of a user-set LS_OPTIONS flag. Script #37, bestcompress, has the following sequence:
smallest="$(ls -l "$name" $Zout $gzout $bzout | \
awk '{print $5"="NR}' | sort -n | cut -d= -f2 | head -1)"
Permission checks in shell script
A reader of my new book Wicked Cool Shell Scripts pointed out that the capability of testing a file permission with find using the ‘+’ notation is GNU-specific.
Can you prevent people from linking to the media on your Web site?
A friend writes:
I’m finding that some number of people are hosting my Janet Jackson
“movie” by simply linking it in from their sites, meaning *I* get to
pay for the bandwidth. Is there some way to prevent this?
Fixing Mac OS X’s “periodic” command
I’ve been discussing the key tasks that a Mac OS X user has to run to ensure that their system stays healthy and in tip-top shape, and one set that we’ve all agreed upon are the daily, weekly and monthly cron jobs. You can figure out when they’re run with a simple grep command.
OVERWHELMED BY TECH?
You are not alone! Join our weekly newsletter to build up your confidence and capabilities in solving everyday technology problemss. Learn to master all your tech and gadgets!
“I love your newsletter. Keep up the very good work!”
– Julie Redd
“Thank you, Dave. I really do appreciate your updates.”
– Peter Kimball
