BASH - Generate-Password.sh - Revision history

Admin: Text replacement - "Category:Wiki" to "Category:Wiki '''''[https://it-arts.net/index.php/Category:Wiki Return to Wiki Index]''''' "

2026-01-17T07:05:41Z

Text replacement - "Category:Wiki" to "Category:Wiki '''''[https://it-arts.net/index.php/Category:Wiki Return to Wiki Index]''''' "

← Older revision		Revision as of 07:05, 17 January 2026
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	[[Category:Wiki]]		[[Category:Wiki]]

			'''''[https://it-arts.net/index.php/Category:Wiki Return to Wiki Index]'''''

Admin at 16:23, 16 December 2025

2025-12-16T16:23:17Z

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 exit 0</nowiki>
 == Source ==
@@ Line 184: / Line 95: @@
   Uppercase letters and digits are placed in a way that eases
   remembering their position when memorizing only the word.</nowiki>
 == Usefull Links ==

Admin at 16:21, 16 December 2025

2025-12-16T16:21:28Z

← Older revision		Revision as of 16:21, 16 December 2025
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	}		}

	if [ $1 = "-y" ]		# Function to regenerate password until it reaches desired length
	then		generate_password() {
	# Generate password with symbols ~~and then filter unwanted characters~~		local length=$1
	password=$(pwgen -N 1 -s $~~1 $2~~)		local include_symbols=$2
	~~filtered_password~~=$(~~filter_password "~~$~~password"~~)		local password=""
	~~echo $filtered_password~~
			while true; do
			if [ "$include_symbols" == "yes" ]; then
			# Generate password with symbols (using -y option of pwgen)
			password=$(pwgen -N 1 -s -y $length) # The -y option guarantees at least one symbol
			else
			# Generate password without symbols
			password=$(pwgen -N 1 $length)
			fi

	~~elif~~ [[ $1 == +([[~~:digit:~~]]) ]]		# Apply the filter to exclude unwanted characters
	then		filtered_password=$(filter_password "$password")
	# Generate password without symbols and ~~then~~ filter unwanted characters
	password=$(~~pwgen -N 1 -s~~ $1)		# If the filtered password is long enough, return it
	~~filtered_password=$(filter_password~~ "~~$password~~")		if [ ${#filtered_password} -ge $length ]; then
	echo $~~filtered_password~~		echo $filtered_password
			break
			fi
			done
			}

			if [ "$1" = "-y" ]; then
			# Generate password with symbols and filter unwanted characters
			password=$(generate_password "$2" "yes")
			echo "PASSWORD WITH SPECIAL CHARS : "
			echo $password

			elif [[ "$1" =~ ^[0-9]+$ ]]; then
			# Generate password without symbols and filter unwanted characters
			password=$(generate_password "$1" "no")
			echo "PASSWORD WITHOUT SPECIAL CHARS : "
			echo $password

	else		else
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	fi		fi

	exit 0		exit 0</nowiki>
	</nowiki>

Admin at 15:29, 14 December 2025

2025-12-14T15:29:27Z

← Older revision		Revision as of 15:29, 14 December 2025
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	# -y, --symbols \| Include at least one special character in the password.		# -y, --symbols \| Include at least one special character in the password.
	#		#
	# $1, '-y' option or password ~~lenght~~		# $1, '-y' option or password length
	#		#
	# $2, password ~~lenght~~ if '-y' option is used		# $2, password length if '-y' option is used

			exclude_chars="iI1oO0"

			# Function to filter out excluded characters
			filter_password() {
			local password=$1
			for char in $(echo $exclude_chars \| sed 's/$.$/\1 /g'); do
			password=$(echo $password \| tr -d $char)
			done
			echo $password
			}

	if [ $1 = "-y" ]		if [ $1 = "-y" ]
	then		then
			# Generate password with symbols and then filter unwanted characters
	pwgen -N 1 -s $1 $2		password=$(pwgen -N 1 -s $1 $2)
			filtered_password=$(filter_password "$password")
			echo $filtered_password

	elif [[ $1 == +([[:digit:]]) ]]		elif [[ $1 == +([[:digit:]]) ]]
	then		then
			# Generate password without symbols and then filter unwanted characters
	pwgen -N 1 -s $1		password=$(pwgen -N 1 -s $1)
			filtered_password=$(filter_password "$password")
			echo $filtered_password

	else		else
			echo "USAGE: ./this-script.sh <'-y' for symbols> <Password Length integer>"
	echo "USAGE: ./this-script.sh <'-y' for symbols> <Password ~~Lenght~~ integer>"

	fi		fi

			exit 0
			</nowiki>
	exit 0</nowiki>

Admin: Text replacement - "Category:Post-It" to "Category:Wiki"

2025-12-08T16:47:30Z

Text replacement - "Category:Post-It" to "Category:Wiki"

← Older revision		Revision as of 16:47, 8 December 2025
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	[[Category:~~Post-It~~]]		[[Category:Wiki]]

Admin at 10:23, 8 June 2024

2024-06-08T10:23:28Z

New page

[[Category:Post-It]]

== Script ==

<nowiki>
#!/bin/bash
#
# Script based on pwgen package, where :
#
# -N, --num-passwords=num | Generate num passwords.
#
# -s, --secure | Generate completely random, hard-to-memorize passwords.
# These should only be used for machine passwords, since otherwise
# it's almost guaranteed that users will simply write the password
# on a piece of paper taped to the monitor...
#
# -y, --symbols | Include at least one special character in the password.
#
# $1, '-y' option or password lenght
#
# $2, password lenght if '-y' option is used

if [ $1 = "-y" ]
then

pwgen -N 1 -s $1 $2

elif [[ $1 == +([[:digit:]]) ]]
then

pwgen -N 1 -s $1

else

echo "USAGE: ./this-script.sh <'-y' for symbols> <Password Lenght integer>"

fi

exit 0</nowiki>

== 'pwgen' Manpage ==

<nowiki>
PWGEN(1) General Commands Manual PWGEN(1)

NAME
pwgen - generate pronounceable passwords

SYNOPSIS
pwgen [ OPTION ] [ pw_length ] [ num_pw ]

DESCRIPTION
The pwgen program generates passwords which are designed to be easily memorized by humans, while being as secure as possible. Human-memorable passwords are never going to be as secure as completely
completely random passwords. In particular, passwords generated by pwgen without the -s option should not be used in places where the password could be attacked via an off-line brute-force attack.
On the other hand, completely randomly generated passwords have a tendency to be written down, and are subject to being compromised in that fashion.

The pwgen program is designed to be used both interactively, and in shell scripts. Hence, its default behavior differs depending on whether the standard output is a tty device or a pipe to another
program. Used interactively, pwgen will display a screenful of passwords, allowing the user to pick a single password, and then quickly erase the screen. This prevents someone from being able to
"shoulder surf" the user's chosen password.

When standard output (stdout) is not a tty, pwgen will only generate one password, as this tends to be much more convenient for shell scripts, and in order to be compatible with previous versions of
this program.

OPTIONS
-0, --no-numerals
Don't include numbers in the generated passwords.

-1 Print the generated passwords one per line.

-A, --no-capitalize
Don't bother to include any capital letters in the generated passwords.

-a, --alt-phonics
This option doesn't do anything special; it is present only for backwards compatibility.

-B, --ambiguous
Don't use characters that could be confused by the user when printed, such as 'l' and '1', or '0' or 'O'. This reduces the number of possible passwords significantly, and as such reduces the
quality of the passwords. It may be useful for users who have bad vision, but in general use of this option is not recommended.

-c, --capitalize
Include at least one capital letter in the password. This is the default if the standard output is a tty device.

-C Print the generated passwords in columns. This is the default if the standard output is a tty device.

-N, --num-passwords=num
Generate num passwords. This defaults to a screenful if passwords are printed by columns, and one password otherwise.

-n, --numerals
Include at least one number in the password. This is the default if the standard output is a tty device.

-H, --sha1=/path/to/file[#seed]
Will use the sha1's hash of given file and the optional seed to create password. It will allow you to compute the same password later, if you remember the file, seed, and pwgen's options
used. ie: pwgen -H ~/your_favorite.mp3#your@email.com gives a list of possibles passwords for your pop3 account, and you can ask this list again and again.

WARNING: The passwords generated using this option are not very random. If you use this option, make sure the attacker can not obtain a copy of the file. Also, note that the name of the
file may be easily available from the ~/.history or ~/.bash_history file.

-h, --help
Print a help message.

-r chars, --remove-chars=chars
Don't use the specified characters in password. This option will disable the phomeme-based generator and uses the random password generator.

-s, --secure
Generate completely random, hard-to-memorize passwords. These should only be used for machine passwords, since otherwise it's almost guaranteed that users will simply write the password on a
piece of paper taped to the monitor...

-v, --no-vowels
Generate random passwords that do not contain vowels or numbers that might be mistaken for vowels. It provides less secure passwords to allow system administrators to not have to worry with
random passwords accidentally contain offensive substrings.

-y, --symbols
Include at least one special character in the password.

AUTHOR
This version of pwgen was written by Theodore Ts'o <tytso@alum.mit.edu>. It is modelled after a program originally written by Brandon S. Allbery, and then later extensively modified by Olaf Titz,
Jim Lynch, and others. It was rewritten from scratch by Theodore Ts'o because the original program was somewhat of a hack, and thus hard to maintain, and because the licensing status of the program
was unclear.

SEE ALSO
passwd(1)

pwgen version 2.08 August 2017 PWGEN(1)
</nowiki>

== Source ==

This script is based on Package:

<nowiki>
pwgen
Version: 2.08-2
Installed-Size: 51
Maintainer: Theodore Y. Ts'o <tytso@mit.edu>
Architecture: amd64
Depends: libc6 (>= 2.14)
Description-en: Automatic Password generation
pwgen generates random, meaningless but pronounceable passwords.
These passwords contain either only lowercase letters, or upper
and lower case mixed, or digits thrown in.
Uppercase letters and digits are placed in a way that eases
remembering their position when memorizing only the word.</nowiki>

== Usefull Links ==

* https://packages.debian.org/sid/pwgen

* https://linuxconfig.org/how-to-use-a-command-line-random-password-generator-pwgen-on-linux