Printing currnt time with file

[QASIM RAO]

hi,i want to create log file for every hour i use radius. now it islog_file = 
${logdir}/radius.logi want like thislog_file = ${logdir}/radius-%Y%m%d:%H.log

if i change file name like above one radius create file '
radius-%Y%m%d:%H.log '  
i want to create it like 'radius-20120903:08.log'
pleae help me in this

Regards

Qasim                                     
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