utilpy

Collection of shell utilities, written in Python.

(once they become large or more useful, they will probably get moved to their own repositories)

Scott Mcdermott <scott@smemsh.net>

https://github.com/smemsh/utilpy/

https://spdx.org/licenses/GPL-2.0

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Contents

• passgen
• chromebak
• gkeepbak
• yamldump
• hostfill
• lensort
• urlcode
• pypath

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passgen

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

https://en.wikipedia.org/wiki/Password_strength

chromebak

Dump chrome browser login data/passwords, stored as type=basic v10 records.

Args: by default, tries to open the Brave profile named Default, otherwise give path to the profile's Login Data file if using different browser variant (like Chrome or Chromium).

gkeepbak

Dump all google keep data to a json file, doing an incremental update from the previous state, provided on stdin, writing updated state to stdout (to keep for input next time), or empty if no changes. Intended to be run from cron for backing up google keep notes.

yamldump

Pretty prints yaml files as python objects.

args: any number of yaml files to print

todo: optionally pre-pass through jinja2

hostfill

Looks for ipv4 addresses in the input and replaces with their looked up name from gethostbyaddr() in the output.

lensort

Sorts the input by line length, with a configurable filter length.

urlcode

Provides the urlencode and urldecode commands, which take all lines of standard input, and all words given in their argument vector, and either encode or decode them for the http url schemes, according to the rules specified in RFC3986 (via urllib.parse).

pypath

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