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Python

#!/usr/local/bin/python
import string, sys
# If no arguments were given, print a helpful message
if len(sys.argv)==1:
print '''Usage:
celsius temp1 temp2 ...'''
sys.exit(0)
# Loop over the arguments
for i in sys.argv[1:]:
try:
fahrenheit=float(string.atoi(i))
except string.atoi_error:
print repr(i), "not a numeric value"
else:
celsius=(fahrenheit-32)*5.0/9.0
print '%i\260F = %i\260C' % (int(fahrenheit), int(celsius+.5))