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seq can produce the same thing as Perl's ... operator.
Optionally, one can use {1..50} instead of seq. E.g. for i in {1..50} ; do echo Iteration $i ; done

rotate a one page pdf to 90 Degrees Clockwise
This can be taken from the pdftk docs http://www.pdflabs.com/docs/pdftk-man-page/ http://www.pdflabs.com/docs/pdftk-cli-examples/ , but the command examples are not simple.

find unreadable file

Uninstall bloatware on your android device without root.
List all packages with: pm list packages|cut -d: -f2

List open sockets protocol/address/port/state/PID/program name

Perl one-liner to determine number of days since the Unix epoch
There are some environments that use this value for password and account expiration. It's helpful to be able to quickly determine the number of days since the Unix epoch (dse) when working directly with the configuration files as an administrator.

View and review the system process tree.
The "pstree" command uses special line-drawing characters. However, when piped into the "less" pager, these are normally disabled.

Binary digits Matrix effect
Prints 0's and 1's in The Matrix style. You can easily modify to print 0-9 digits using $RANDOM %10 insted of %2.

Compress a file or directory keeping the owner and permissions

Pick a random line from a file


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