You want to use the -newermt option for find:

find /media/WD/backup/osool/olddata/ -newermt 20120101 -not -newermt 20130101

to get all the files with modification time in 2012.

Miller is like awk, sed, cut, join, and sort for name-indexed data such as CSV, TSV, and tabular JSON. You get to work with your data using named fields, without needing to count positional column indices.

This is something the Unix toolkit always could have done, and arguably always should have done. It operates on key-value-pair data while the familiar Unix tools operate on integer-indexed fields: if the natural data structure for the latter is the array, then Miller’s natural data structure is the insertion-ordered hash map. This encompasses a variety of data formats, including but not limited to the familiar CSV, TSV, and JSON. (Miller can handle positionally-indexed data as a special case.)

(A Net Ethology / A Troll's Confection)

 When a person's sanity is at balance,
 when human passion is raging,
 no etiquette must get in the way.
     —Xah Lee, 2001.

The internet has changed society deeply. It has indirectly changed nations, catapulted sciences, deeply imbued the daily lives of men, and as well affected writings and have created a culture one of a kind, among which is FAQ (Frequently Asked Questions), Netiquette, and Trolling. Netiquette refers to Net Etiquette. It is the implicit rules in online communities, widely purveyed in the early days of internet (pre-1997) but faded quietly with the mainstreaming of internet. Troll roughly refers to someone who posts a message that solicit outwardly or indirectly a huge usually chaotic following. In these pages, are collected essays on these phenomena.

I as a troll is rather special because i tend to put a final say on things, in contrast with one-liner trolls i myself despise. (In a sense i'm an anti-troll, untroll, or an atrocious atroll.) At first i balked at being branded a troll. Now i revel it. I as a troll is rather recent, beginning and getting worse about in 1998. I have been using online forums since 1990. Perhaps one day i'll write “how i became a troll”. It is bound to be a tragedy. 
—Xah Lee, 2002.

I'll find a day to massacre them all, And raze their faction and their family… 
    —William Shakespeare, in Titus Andronicus

Acme is a powerful text editor, development environment and textual-user-interface platform developed by Rob Pike originally for Plan 9 from Bell Labs research operating system, and now has ports available for all major platforms.

We represent a group of scientists, hackers and other misfits.

Uzbl is a lightweight webkit browser following the UNIX philosophy - to do one thing and do it well.

You can sort then uniq:

$ sort -u file.txt