Commands by chars19

Commands by chars19 (2)

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Calculate pi with specific scale

a() function in bc is for arctangent, available if using -l option included. Show Sample Output
This is sample output - yours may be different.
```
3.1415926532
```
1

echo 'scale=10; 4*a(1)' | bc -l

chars19 · 2012-10-08 15:03:07 4
Capture screen with timer
This is sample output - yours may be different.
0

sleep 3;import -window root output.png

chars19 · 2012-07-24 15:33:06 0

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Find usb device in realtime

Using this command you can track a moment when usb device was attached.

Using Git, stage all manually deleted files.

-u tells git to automatically stage all changes to files in the index (eg. deleted and modified files). See: http://stackoverflow.com/questions/1402776/how-do-i-commit-all-deleted-files-in-git http://kernel.org/pub/software/scm/git/docs/git-add.html

Embed next line on the end of current line using sed

N: On the current line, sed will display it on pattern space, plus a \n (new line); but s/\n//: Will get rid of new line displayed on pattern space, joining the current line's end with the start of the next line Useful in scripts.

Check if a machine is online with better UI

I have used single packet, and in a silent mode with no display of ping stats. This is with color and UI improvement to the http://www.commandlinefu.com/commands/view/10220/check-if-a-machine-is-online. It is as per the enhancements suggested.

tcpdump whole packets to file in ascii and hex with ip adresses instead of hostname

Delete all but latest file in a directory

Useful for deleting old unused log files.

Display the inodes number of /

Prints new content of files

Useful to e.g. keep an eye on several logfiles.

Get the list of local files that changed since their last upload in an S3 bucket

Can be useful to granulary flush files in a CDN after they've been changed in the S3 bucket.

Find the package that installed a command

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