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Cleans all files in /tmp that have been accessed at least 2 days ago.
You can also do this for seconds, minutes, hours, etc... Can't use dates before the epoch, though.
Useful contexts :
You are doing yoga or some other physical training in which you are holding a position.
Or you practice the pomodoro productivity technique.
Or your girlfriend said "We're leaving in 40 minutes".
Design details:
sleep executes before espeak to give you a 5 seconds head start.
espeak is run in the background so it doesn't mess up the timing.
pretty self explanitory
Useful for backing up old files, custom logs, etc. via a cronjob.
One of my favorite ways to impress newbies (and old hats) to the power of the shell, is to give them an incredibly colorful and amazing version of the top command that runs once upon login, just like running fortune on login. It's pretty sweet believe me, just add this one-liner to your ~/.bash_profile -- and of course you can set the height to be anything, from 1 line to 1000!
$ G=$(stty -g);stty rows $((${LINES:-50}/2));top -n1; stty $G;unset G
Doesn't take more than the below toprc file I've added below, and you get all 4 top windows showing output at the same time.. each with a different color scheme, and each showing different info. Each window would normally take up 1/4th of your screen when run like that - TOP is designed as a full screen program. But here's where you might learn something new today on this great site.. By using the stty command to change the terminals internal understanding of the size of your terminal window, you force top to also think that way as well.
# save the correct settings to G var.
$ G=$(stty -g)
# change the number of rows to half the actual amount, or 50 otherwise
$ stty rows $((${LINES:-50}/2))
# run top non-interactively for 1 second, the output stays on the screen (half at least)
$ top -n1
# reset the terminal back to the correct values, and clean up after yourself
$ stty $G;unset G
This trick from my [ http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html bash_profile ], though the online version will be updated soon. Just think what else you could run like this!
Note 1: I had to edit the toprc file out due to this site can't handle that (uploads/including code). So you can grab it from [ http://www.askapache.com/linux-unix/bash-power-prompt.html my site ]
Note 2: I had to come back and edit again because the links weren't being correctly parsed
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"
Sometimes my /var/cache/pacman/pkg directory gets quite big in size. If that happens I run this command to remove old package files. Packages that we're upgraded in last N days are kept in case you are forced to downgrade a specific package. The command is obviously Arch Linux related.
