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Convert CSV to JSON
Replace 'csv_file.csv' with your filename.

Find the package that installed a command

List processes sorted by CPU usage

To get how many users logged in and logged out and how many times ?

Find the package that installed a command

Display a block of text: multi-line grep with perl
-n reads input, line by line, in a loop sending to $_ Equivalent to while () { mycode } -e execute the following quoted string (i.e. do the following on the same line as the perl command) the elipses .. operator behaves like a range, remembering the state from line to line.

Wget Command to Download Full Recursive Version of Web Page
The example will create a directory called "www.foo.com" that will contain an index.html page and any necessary images/css required for the page to load. Caveats: @imports of css files will not be converted.

Rename HTML files according to their title tag
The above one-liner could be run against all HTML files in a directory. It renames the HTML files based on the text contained in their title tag. This helped me in a situation where I had a directory containing thousands of HTML documents with meaningless filenames.

back ssh from firewalled hosts
host B (you) redirects a modem port (62220) to his local ssh. host A is a remote machine (the ones that issues the ssh cmd). once connected port 5497 is in listening mode on host B. host B just do a ssh 127.0.0.1 -p 5497 -l user and reaches the remote host'ssh. This can be used also for vnc and so on.

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


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