Collection of shell utilities, written in Python.
(once they become large or more useful, they will probably get moved to their own repositories)
output random password from [[:alnum:]] ^ [0Ol1I], default 128 bits
- generates a random password with specifiable entropy
- chars: a-z, A-Z, 0-9, except: 0, O, l, 1, I (== 57 possible)
- default 22 char password (~128 bits entropy using our charset)
- uses python random.SystemRandom (on linux, os.urandom())
- uses random.choice() to map into range of suitable characters
args:
- arg1: number of bits of entropy the secret should have, default 128
calculation:
passlen = 22
setsize = len([[:alnum:]]) - 5 # ([^0Ol1I])
= 26 + 26 + 10 - 5 = 57
entropy = log2(setsize^passlen)
= log2(setsize) * passlen
= passlen * (ln(setsize) / ln(2))
= 22 * (ln(57) / ln(2))
= 128.3235803212
todo:
- allow to specify length instead of computing by entropy
- allow to specify character set
also:
https://en.wikipedia.org/wiki/Password_strength
Pretty prints yaml files as python objects.
args: any number of yaml files to print
todo: optionally pre-pass through jinja2
Counts lines in the standard input, or the given files.
- equivalent to wc -l (different output format if files given)
- 5x slower than C version (wc -l) in measurements, python-3.9.5
Prints sys.path on separate lines, using interpreter as given in
invocation (python, python2 or python3 for pypath,
py2path, and py3path, respectively).
example:
$ py3path /home/scott/bin /opt/python-3.12.6/lib/python312.zip /opt/python-3.12.6/lib/python3.12 /opt/python-3.12.6/lib/python3.12/lib-dynload /home/scott/.local/lib/python3.12/site-packages /opt/python-3.12.6/lib/python3.12/site-packages