Commands by GregoryHolmes (0)

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list block devices
Shows all block devices in a tree with descruptions of what they are.

Get the size of all the directories in current directory

FLV to AVI with subtitles and forcing audio sync using mencoder
Gives MPEG-4/DivX output video file ready for uploading to YouTube from FLV file downloaded from the site and your own subtitle file UTF-8 encoded. No resizing needed. (?)

Change the From: address on the fly for email sent from the command-line
It's very common to have cron jobs that send emails as their output, but the From: address is whatever account the cron job is running under, which is often not the address you want replies to go to. Here's a way to change the From: address right on the command line. What's happening here is that the "--" separates the options to the mail client from options for the sendmail backend. So the -f and -F get passed through to sendmail and interpreted there. This works on even on a system where postfix is the active mailer - looks like postfix supports the same options. I think it's possible to customize the From: address using mutt as a command line mailer also, but most servers don't have mutt preinstalled.

a function to find the fastest DNS server
http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

Show how old your linux OS installtion is
..not guaranteed to always be accurate but fun to see how old you Linux installation is based on the root partitions file system creation date.

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

Select and Edit a File in the Current Directory
This command displays a simple menu of file names in the current directory. After the user made a choice, the command invokes the default editor to edit that file. * Without the break statement, the select command will loop forever * Setting the PS3 prompt is optional * If the user types an invalid choice (such as the letter q), then the variable $f will become an empty string. * For more information, look up the bash's select command

Sort installed rpms in alphabetic order with their size.

Convert CSV to JSON
Replace 'csv_file.csv' with your filename.


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