1 #! /usr/bin/env python

2 #

3 # A template for building unix style command line utilities like head(1),

4 # nl(1), or cat(1).

5 #

6 import fileinput

7 import optparse

8

9 VERSION = '0.1.0'

10

11

12 # Set up the command line parser. Help (-h, --help) and version (--version)

13 # switches are already enabled. See http://docs.python.org/library/optparse.html

14 #

15 op = optparse.OptionParser(

16 usage='%prog [options] filenames...',

17 version='%prog ' + VERSION)

18

19 op.add_option('-l', '--list-filenames', action='store_true',

20 help="List filenames")

21 op.add_option('-n', '--number', action='store_true',

22 help="Print line numbers")

23

24 opts, args = op.parse_args()

25

26

27 # Iterate over all input files: If no file names are given on the command line,

28 # read from stdin. Otherwise iterate over all given files, with '-' being

29 # stdin. See http://docs.python.org/library/fileinput.html

30 #

31 for line in fileinput.input(args):

32 if opts.list_filenames and fileinput.isfirstline():

33 print "==>", fileinput.filename(), "<=="

34

35 if opts.number:

36 print "%d:%d: %s" % (fileinput.lineno(), fileinput.filelineno(), line),

37 else:

38 print line,

39

40 fileinput.close()

41

42 # EOF