Created
October 17, 2017 17:17
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Checksum files (sha1)
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#!/usr/bin/env python | |
import hashlib | |
import sys | |
bsz = 8192 | |
for f in sys.argv[1:]: | |
sha1sum = hashlib.sha1() | |
with open(f, 'rb') as source: | |
while True: | |
block = source.read(bsz) | |
if len(block) == 0: | |
break | |
sha1sum.update(block) | |
print(f, sha1sum.hexdigest()) | |
for f in sys.argv[1:]: | |
sha1sum = hashlib.sha1() | |
with open(f, 'rb') as fd: | |
sha1sum.update(fd.read()) | |
print(f, sha1sum.hexdigest()) | |
for f in sys.argv[1:]: | |
with open(f, 'rb') as fd: | |
print(f, hashlib.sha1(fd.read()).hexdigest()) |
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The first one helps limit the block size per read to 8K, so for big files you don't read everything into memory. The last one is just the most compact form.