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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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

Concating pdf files

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.

Top 30 History
Top 30 History Command line with histogram display

Release memory used by the Linux kernel on caches
=1 --> to free pagecache =2 --> to free dentries and inodes =3 --> to free pagecache, dentries and inodes

Print all open regular files sorted by the number of file handles open to each.
This command run fine on my Ubuntu machine, but on Red Hat I had to change the awk command to `awk '{print $10}'`.

Last Minute Cheap Essay
Writing a paper is never an easy chore. When students start college, they are confronted with a variety of new situations, but one of the most difficult is completing projects before the deadline. Many students' physical and mental health can suffer as a result of pressure, stress, and anxiety. International students face significant difficulties because English is a difficult language for them. After lessons and long college hours, many students don’t have the time or energy to write extensive essays. Students can be seen juggling classes, jobs, social lives, and finding time for themselves. I need someone to write an essay for me, you might be thinking. Prepare to be surprised! With our assignment service, we can help you get rid of all of your troubles. We will write an A+ essay for you to ensure that you get good grades on your tasks.

File rotation without rename command
Rotates log files with "gz"-extension in a directory for 7 days and enumerates the number in file name. i.e.: logfile.1.gz > logfile.2.gz I needed this line due to the limitations on AIX Unix systems which do not ship with the rename command.

duration of the DNS-query

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


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