Code:
i use:
GNU bash, version 4.2.45(1)-release (x86_64-suse-linux-gnu)
sed -n '/[0-3][0-9]\/['$y']/p' $Home/../scripte/pd_0.txt
y is a variable, build bei the shell-command y=`date +%y`
### data-format in pd_0.txt
2985,12/31/13,23:30,92637,9135,10018,9758,8504,6555,4573,2834,...
2986,12/31/13,23:40,97195,9281,10080,9868,8752,7091,4792,2951,...
2987,12/31/13,23:50,95258,9453,10164,10154,9285,7146,4919,2982...
2988,01/01/14,00:00,100358,9745,10622,10376,9291,7475,5222,3395,...
2989,01/01/14,00:10,128834,11704,13456,14235,13857,12485,10119,...
2990,01/01/14,00:20,165685,13613,16164,17818,18713,18242,15764,....