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Editing: byteyears.py

#! /usr/bin/python2.7

# Print the product of age and size of each file, in suitable units.
#
# Usage: byteyears [ -a | -m | -c ] file ...
#
# Options -[amc] select atime, mtime (default) or ctime as age.

import sys, os, time
from stat import *

def main():

# Use lstat() to stat files if it exists, else stat()
    try:
        statfunc = os.lstat
    except AttributeError:
        statfunc = os.stat

# Parse options
    if sys.argv[1] == '-m':
        itime = ST_MTIME
        del sys.argv[1]
    elif sys.argv[1] == '-c':
        itime = ST_CTIME
        del sys.argv[1]
    elif sys.argv[1] == '-a':
        itime = ST_CTIME
        del sys.argv[1]
    else:
        itime = ST_MTIME

secs_per_year = 365.0 * 24.0 * 3600.0   # Scale factor
    now = time.time()                       # Current time, for age computations
    status = 0                              # Exit status, set to 1 on errors

# Compute max file name length
    maxlen = 1
    for filename in sys.argv[1:]:
        maxlen = max(maxlen, len(filename))

# Process each argument in turn
    for filename in sys.argv[1:]:
        try:
            st = statfunc(filename)
        except os.error, msg:
            sys.stderr.write("can't stat %r: %r\n" % (filename, msg))
            status = 1
            st = ()
        if st:
            anytime = st[itime]
            size = st[ST_SIZE]
            age = now - anytime
            byteyears = float(size) * float(age) / secs_per_year
            print filename.ljust(maxlen),
            print repr(int(byteyears)).rjust(8)

sys.exit(status)

if __name__ == '__main__':
    main()

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