simple way to read an array in ksh

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Hello experts, I need help in my code. I have an input file like this: 100814 1205 1724127 7451382 -10 00:30:1b:48:92:3a 100814 1206 1724127 7451382 -72 00:30:1b:48:92:3a 100814 1207 1724127 7451382 -72 00:30:1b:48:90:3b 100814 1208 1724127 7451382 -72 00:30:1b:48:92:3a 100814 1209...

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Hi, Simple question I am sure... I need to put yesterdays date in the name of a filename, ie assign yesterdays date to a variable and then I can use it where I want.. using the format yyyymmdd Any suggestions?

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