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Display duplicated lines in a file
Displays the duplicated lines in a file and their occuring frequency.

Insert the last argument of the previous command
for example if you did a: $ ls -la /bin/ls then $ ls !$ is equivalent to doing a $ ls /bin/ls

Find dupe files by checking md5sum

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.

Restore a local drive from the image on remote host via ssh

Mac OS X: Change Color of the ls Command
I use terminal with black background on the Mac. Unfortunately, the default ls color for the directory is blue, which is very hard to see. By including the line above in my ~/.bash_profile file, I changed the directory's color to cyan, which is easer to see. For more information on the syntax of the LSCOLORS shell variable: $ man ls I tested this command on Mac OS X Leopard

Test file system type before further commands execution
Exclude 400 client hosts with NFS auto-mounted home directories. Easily modified for inclusion in your scripts.

Remove security limitations from PDF documents using ghostscript
Remove security from PDF document using this very simple command on Linux and OSX. You need ghostscript for this baby to work.

Scan for [samba|lanman] NetBIOS names and ip addresses in LAN by ARP.

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


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