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The (in)famous "FizzBuzz" programming challenge, answered in a single line of Bash code. The "|column" part at the end merely formats the output a bit, so if "column" is not installed on your machine you can simply omit that part. Without "|column", the solution only uses 75 characters.
The version below is expanded to multiple lines, with comments added.
for i in {1..100} # Use i to loop from "1" to "100", inclusive.
do ((i % 3)) && # If i is not divisible by 3...
x= || # ...blank out x (yes, "x= " does that). Otherwise,...
x=Fizz # ...set x to the string "Fizz".
((i % 5)) || # If i is not divisible by 5, skip (there's no "&&")...
x+=Buzz # ...Otherwise, append (not set) the string "Buzz" to x.
echo ${x:-$i} # Print x unless it is blanked out. Otherwise, print i.
done | column # Wrap output into columns (not part of the test).
This let you know which modules has loaded the Apache server, very useful to know if the mod_rewrite is ready to use.
tar's directory and sends to netcat listening on port 10000
On the client end:
netcat [server ip] 10000 | tar xfvz -
This will send it over the network and extract it on the clients machine.
The really awesome bash completion in debian seems to be an extra package now, which has to be installed. After sourcing /etc/bash_completion it completes almost everything (package names in apt... etc) :-)
To make this permanent, put something like this in your .bashrc:
if [ -f /etc/bash_completion]; then
source /etc/bash_completion
fi
Based on capsule8 agent examples, not rigorously tested
i sorta stole this from
http://www.shell-fu.org/lister.php?id=878#MTC_form
but it didn't work, so here it is, fixed.
---
updated to work with jpegs, and to use a fancy positive look behind assertion.
Tweeting from terminal to twitter accounts..
I have a remote php file that I want to run once an hour. I set up cron to run this wget. I don't really care about what's in the file though, I don't want to save the results, so I run the -O and send it to /dev/null