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.

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