Commands by Coderjoe

Commands by Coderjoe (1)

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Get the total length of all video / audio in the current dir in H:m:s

Better awk example, using only mplayer, grep, cut, and awk. Show Sample Output
This is sample output - yours may be different.
```
25:10:59
```
0

mplayer -endpos 0.1 -vo null -ao null -identify *.avi 2>&1 |grep ID_LENGTH |cut -d = -f 2|awk '{SUM += $1} END { printf "%d:%d:%d\n",SUM/3600,SUM%3600/60,SUM%60}'

Coderjoe · 2011-12-12 15:49:07 4

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Display list of available printers

Route outbound SMTP connections through a addtional IP address rather than your primary

Grep all non-ascii character in file

It will highlight non-ascii character in a file. those character can cause problem for some application parsing ascii file.

Change host name

With sed you can replace strings on the fly.

Synchronise a file from a remote server

You will be prompted for a password unless you have your public keys set-up.

list block devices

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

Instant mirror from your laptop + webcam (fullscreen+grab)

This directly puts the "mirror" into fullscreen, and lets you take photos by pressing the 's' key. I bet appearance conscious people will have keyboard shortcut for this command by now.

Replace duplicate files by hardlinks

find all active IP addresses in a network

You send a unicast ICMP packet to each host. Many firewalls will drop that ICMP. However, in order to send the ICMP, you'll have first done an ARP request and the remote machine is unlikely to ignore that, so the computer will be in your ARP table.

Copy modification timestamp from one file to another.

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