Commands using ls (517)

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Disconnect telnet
You are stuck with testing a tcp port using telnet, and must kill the telnet session from another terminal... Or, press ctrl+5 and write close/quit to force the current connection to close..

list files recursively by size

dont log current session to history

Use /dev/full to test language I/O-failsafety
The Linux /dev/full file simulates a "disk full" condition, and can be used to verify how a program handles this situation. In particular, several programming language implementations do not print error diagnostics (nor exit with error status) when I/O errors like this occur, unless the programmer has taken additional steps. That is, simple code in these languages does not fail safely. In addition to Perl, C, C++, Tcl, and Lua (for some functions) also appear not to fail safely.

use mplayer to watch Apple Movie Trailer instead of quicktime player
http://trailers.apple.com/trailers/ just copy the .mov link and use mplayer to stream

Synchronize date and time with a server over ssh
using -u is better for standardizing date output and timezones, for servers in different timezones.

list processes with established tcp connections (without netstat)
Uses lsof to list open network connections (file descriptors), grepping for only those in an established state

Show drive names next to their full serial number (and disk info)

Banner Grabber

Create directory named after current date
Not a discovery but a useful one nontheless. In the above example date format is 'yyyymmdd'. For other possible formats see 'man date'. This command can be also very convenient when aliased to some meaningful name: $ alias mkdd='mkdir $(date +%Y%m%d)'


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