1 #!/usr/bin/env python

2 import os

3 import sys

4 from optparse import OptionParser

5

6 # make sure duplicate path elements aren't printed twice

7 def ordered_set(alist):

8 seen = set()

9 new = []

10 for item in alist:

11 if item in seen:

12 continue

13 seen.add(item)

14 new.append(item)

15 return new

16

17 def lsex(path=None):

18 """

19 list executable files on the path

20 - path: list of directories to search. if not specified, use system path

21 """

22

23 if path is None:

24 # use system path

25 path = ordered_set(os.environ['PATH'].split(':'))

26

27 executables = []

28

29 # add the executable files to the list

30 for i in path:

31 if not os.path.isdir(i):

32 continue

33 files = [ os.path.join(i,j) for j in os.listdir(i) ]

34 files = filter(lambda x: os.access(x, os.X_OK), files)

35 files.sort() # just to make the output pretty

36 executables.extend(files)

37 return executables

38

39 def executable_names(path=None):

40 executables = lsex(path)

41 executables = set([os.path.basename(i) for i in executables])

42 return executables

43

44 if __name__ == '__main__':

45 parser = OptionParser()

46 parser.add_option('--names', action='store_true', default=False,

47 help="list only the set of names")

48

49 options, args = parser.parse_args()

50 if options.names:

51 for i in sorted(executable_names()):

52 print i

53 sys.exit(0)

54

55 for i in lsex():

56 print i