1 #! /usr/bin/env python

     2 

     3 # Print the product of age and size of each file, in suitable units.

     4 #

     5 # Usage: byteyears [ -a | -m | -c ] file ...

     6 #

     7 # Options -[amc] select atime, mtime (default) or ctime as age.

     8 

     9 import sys, os, time

    10 from stat import *

    11 

    12 def main():

    13 

    14     # Use lstat() to stat files if it exists, else stat()

    15     try:

    16         statfunc = os.lstat

    17     except AttributeError:

    18         statfunc = os.stat

    19 

    20     # Parse options

    21     if sys.argv[1] == '-m':

    22         itime = ST_MTIME

    23         del sys.argv[1]

    24     elif sys.argv[1] == '-c':

    25         itime = ST_CTIME

    26         del sys.argv[1]

    27     elif sys.argv[1] == '-a':

    28         itime = ST_CTIME

    29         del sys.argv[1]

    30     else:

    31         itime = ST_MTIME

    32 

    33     secs_per_year = 365.0 * 24.0 * 3600.0   # Scale factor

    34     now = time.time()                       # Current time, for age computations

    35     status = 0                              # Exit status, set to 1 on errors

    36 

    37     # Compute max file name length

    38     maxlen = 1

    39     for filename in sys.argv[1:]:

    40         maxlen = max(maxlen, len(filename))

    41 

    42     # Process each argument in turn

    43     for filename in sys.argv[1:]:

    44         try:

    45             st = statfunc(filename)

    46         except os.error, msg:

    47             sys.stderr.write("can't stat %r: %r\n" % (filename, msg))

    48             status = 1

    49             st = ()

    50         if st:

    51             anytime = st[itime]

    52             size = st[ST_SIZE]

    53             age = now - anytime

    54             byteyears = float(size) * float(age) / secs_per_year

    55             print filename.ljust(maxlen),

    56             print repr(int(byteyears)).rjust(8)

    57 

    58     sys.exit(status)

    59 

    60 if __name__ == '__main__':

    61     main()