//View Tip #161
» Bash efficiency formula ;-)
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Seb
Jesse
Marcel
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This is a simpler password generator.
Note that the 'tr' strips out everything except characters in the ranges (alphanumeric, mixed case and underscores). This is a nice approach as piping to head means the minimum number of bytes required to generate a password of appropriate length are taken from /dev/urandom vs other methods which take more than you should need but still have a chance of not having obtained enough random data to generate a password of the required length. You can change the parameter to head to get passwords of any length.
< /dev/urandom tr -dc A-Za-z0-9_ | head -c8
Note that the 'tr' strips out everything except characters in the ranges (alphanumeric, mixed case and underscores). This is a nice approach as piping to head means the minimum number of bytes required to generate a password of appropriate length are taken from /dev/urandom vs other methods which take more than you should need but still have a chance of not having obtained enough random data to generate a password of the required length. You can change the parameter to head to get passwords of any length.
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SebAnother way to do it:
dd if=/dev/urandom ibs=6 count=1 2>/dev/null | base64
dd if=/dev/urandom ibs=6 count=1 2>/dev/null | base64
Posted 2009-02-24 23:53:31
JesseYou can add special chars as well.
< /dev/urandom tr -dc 'A-Za-z0-9[=!=][=$=][=@=][=%=][=^=]' | head -c9 ; echo
< /dev/urandom tr -dc 'A-Za-z0-9[=!=][=$=][=@=][=%=][=^=]' | head -c9 ; echo
Posted 2009-06-04 15:31:56
MarcelThanks! That was just what I was looking for!
This is what I use for strong passwords:
< /dev/urandom tr -dc [:graph:] | head -c 256; echo
or base64 encoded, so nobody sees it accidentally.
< /dev/urandom tr -dc [:graph:] | head -c 256| uuencode -m -
This is what I use for strong passwords:
< /dev/urandom tr -dc [:graph:] | head -c 256; echo
or base64 encoded, so nobody sees it accidentally.
< /dev/urandom tr -dc [:graph:] | head -c 256| uuencode -m -
Posted 2009-07-24 06:22:16
< /dev/urandom tr -dc A-Za-z0-9_ | head -c8 ; echo