Quick 'n' dirty password generation commands for *nix/mac

pwgen_a.sh

# Will generate passwords up to 76 characters long.
#
# Change the 20 at the end to change the length.

dd if=/dev/urandom count=1 2> /dev/null | base64 | sed -ne 2p | cut -c-20

pwgen_b.sh

# Will generate passwords up to 40 characters long. Only uses hex characters
# if symbols freak you out.
#
# Change the 20 at the end to change the length.

dd if=/dev/urandom count=1 2> /dev/null | sha1sum | cut -c-20

pwgen_c.sh

# Will generate passwords of any length. Must have openssl installed.
#
# Change PW_LENGTH=20 at the start to specify the length.

PW_LENGTH=20; openssl rand -base64 $PW_LENGTH | tr -d '\n=' | cut -c-$PW_LENGTH

pwgen_d.sh

# Will generate passwords of any length. Must have openssl installed. Only
# uses hex characters if symbols freak you out.
#
# Change PW_LENGTH=20 at the start to specify the length.

PW_LENGTH=20; openssl rand -hex $PW_LENGTH | cut -c-$PW_LENGTH

Lots of lovely hacky single line randomish password generators.