File: fixps.py

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#!/usr/bin/env python

# Fix Python script(s) to reference the interpreter via /usr/bin/env python.
# Warning: this overwrites the file without making a backup.

import sys
import re


def main():
    for filename in sys.argv[1:]:
        try:
            f = open(filename, 'r')
        except IOError, msg:
            print filename, ': can\'t open :', msg
            continue
        line = f.readline()
        if not re.match('^#! */usr/local/bin/python', line):
            print filename, ': not a /usr/local/bin/python script'
            f.close()
            continue
        rest = f.read()
        f.close()
        line = re.sub('/usr/local/bin/python',
                      '/usr/bin/env python', line)
        print filename, ':', repr(line)
        f = open(filename, "w")
        f.write(line)
        f.write(rest)
        f.close()

if __name__ == '__main__':
    main()