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Goverp
Advocate
Joined: 07 Mar 2007
Posts: 2175
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 Posted: Sat Sep 07, 2024 6:45 pm Post subject: A tiny password generator script |
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This script one-liner is a shorter version of one that appears on the Internet, using /dev/urandom:
| Code: | | dd if=/dev/urandom bs=12 count=1 status=none | base64 |
The result is a 16-byte totally unmemorable ASCII string complete (usually) with special characters, upper/lower case and numbers, so it's useful if you store the results in a password vault, but not much otherwise! Sometimes it generates unacceptable passwords - something that doesn't have special characters or numbers or perhaps special characters or whatever, so try again!
(The longer Internet version is along the lines of
| Code: | | dd if=/dev/urandom count=1 2> /dev/null | uuencode -m - | sed -ne 2p | cut -c-8 |
which takes depletes your entropy by 512 bytes before throwing most of it away, uses "uuencode", which needs an extra package, and sed and cut, and is generally nasty.)
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Zucca
Moderator
Joined: 14 Jun 2007
Posts: 3687
Location: Rasi, Finland
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| Posted: Sat Sep 07, 2024 7:38 pm Post subject: |
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I've used | Code: | | tr -dc '[allovedcharacters]' < /dev/random | head -c <length> |
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| Quote: | | I am NaN! I am a man! |
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pjp
Administrator
Joined: 16 Apr 2002
Posts: 20484
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| Posted: Sat Sep 07, 2024 11:22 pm Post subject: |
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While this is a script of more than one generator, it can be reduce to one of them. I never settled on one. Also, where credit is given, mistakes should be presumed to be mine. | Code: | # passphrase
bewaitered*Aile%retrovaccinate
tycoondiceboxsuppleheptene
patientpoisedkenoticxerotic.
pyxides sail letter distad.
calaisdeadeyeinfamyamidid |
| Code: | #!/bin/sh
set -efu
declare -a w n
w=( $( shuf -n3 /usr/share/dict/words ) )
n=( $( shuf -n2 -e \! \" \# \$ \% \& \' \( \) \* \+ \, \- \. \/ \: \; \< \= \> \? \@ \[ \\ \] \^ \_ \` \{ \| \} \~ ) )
for i in {0..2}; do
if [[ $(( $RANDOM % 2 )) = 0 ]]; then
w[$i]="${w[$i]^}"
fi
done
printf '%s%s%s%s%s\n' "${w[0]}" "${n[0]}" "${w[1]}" "${n[1]}" "${w[2]}"
###############################################################################
# Remove words with:
# - too many or too few characters
# - apostrophes, hyphens, or capitalization
# - Removing spaces is optional. (eccerr0r)
echo $(egrep '^[a-z]{4,7}$' /usr/share/dict/words|shuf -n4)|tr -d ' '
###############################################################################
# - avoid use of tr with printf (Hu)
printf '%s%s%s%s\n' $(grep -E '^[a-z]{4,7}$' /usr/share/dict/words|shuf -n4).
# With spaces
printf '%s %s %s %s\n' $(grep -E '^[a-z]{4,7}$' /usr/share/dict/words|shuf -n4).
# work regardless of the shuffle count
# relies on printf to
# - discard the whitespace (newlines)
# - then uses a bare echo to emit a newline at the end.
{ printf '%s' $(grep -E '^[a-z]{4,7}$' /usr/share/dict/words|shuf -n4); echo; } |
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sMueggli
Guru
Joined: 03 Sep 2022
Posts: 489
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| Posted: Sun Sep 08, 2024 8:40 am Post subject: |
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| Code: | | openssl rand -base64 12 |
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