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Method 1:

metadata = 'echo ' + str(msg.header.seq)+ ' , ' + str(msg.header.stamp) + ' , ${PWD}' + '/' +sys.argv[1]+'/frame_' + str(msg.header.stamp) + '.jpeg' + '>> ${PWD}' + '/' +sys.argv[1]+'/metadata.csv'

os.system(metadata)

Method 2:

with open('metadata.csv','ab') as f:
    thewriter = csv.writer(f)
    thewriter.writerow(['frame_id', 'seqno','stamp','name'] )
    thewriter.writerow([str(msg.header.frame_id), str(msg.header.seq),str(msg.header.stamp), 'frame_'+ str(msg.header.stamp) + '.jpeg'])

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