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Find files that have been modified on your system in the past 60 minutes
Useful mainly for debugging or troubleshooting an application or system, such as X11, Apache, Bind, DHCP and others. Another useful switch that can be combined with -mmin, -mtime and so forth is -daystart. For example, to find files that were modified in the /etc directory only yesterday: $ sudo find /etc -daystart -mtime 1 -type f

Use -t when using find and cp
-t, --target-directory=DIRECTORY (copy all SOURCE arguments into DIRECTORY).

Recover tmp flash videos (deleted immediately by the browser plugin)
Newer versions of the flashplayer browser plugin delete the tmp flash video immediately after opening a filehandle to prevent the user from "exporting" the video by simply copying the /tmp/FlashXYZ file. This command searches such deleted flash videos and creates symbolic links to the opened filehandle with the same name as the deleted file. This allows you to play your flash-videos (from e.g. youtube) with e.g. mplayer or copy the buffered video if you want to keep it.

checking space availabe on all /proc/mounts points (using Nagios check_disk)
More info here: http://nagioswiki.com/wiki/index.php/Checking_/proc/mounts_on_remote_server

Sort disk usage from directories
Sort disk usage from directories in the current directory

Open a file at the specified line
You may also use +line:column syntax.

Prepend a text to a file.
Using the sed -i (inline), you can replace the beginning of the first line of a file without redirecting the output to a temporary location.

Get and read log from remote host (works with log on pipe, too)

Find Malware in the current and sub directories by MD5 hashes
Command makes use of the Malware Hash Registry (http://www.team-cymru.org/Services/MHR/). It parses the current directory and subdirectories and calculates the md5 hash of the files, then prints the name and sends the hash to the MHR for a lookup in their database. The 3rd value in the result is the detection percentage across a mix of AV packages.

Find dead symbolic links


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