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pwgen

pwgen is a password generator.

To generate 5 lines of secure 20 character passwords:

pwgen -s -1 20 5

To generate an xkcd style password using your computer's dictionary, use this command:

shuf -n 6 /usr/share/dict/words | sed -e s/"'"//g | tr '\n' ' ' | sed 's/ //g' && echo \

Change shuf -n 6 to adjust the word length.

Another dictionary:

shuf -n3 /usr/share/hunspell/en_US.dic | sed 's,/.*,,' | paste -sd . -