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To generate a random password you can use pwgen:

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.

Generate 7 passwords of length 13:

geek@liv-inspiron:~$ pwgen 13 7
Eu7Teadiphaec giepahl3Oyaiy iecoo9Aetaib4 phaiChae6Eivi athoo3igee8Co
Iphu4ufeDeelo aesoYi2lie9he 

As mentioned in the comments, you can avoid reducing entropy by using the -s argument (i.e. generate more secure, completely random but hard to remember passwords):

geek@liv-inspiron:~$ pwgen -s 13 7
eAfycrPlM4cYv 4MRXmZmyIVNBp D8y71iqjG7Zq7 FQRHcserl4R8O yRCUtPtV3dsqV
0vJpp2h0OrgF1 QTp7MKtJyTrjz 

To generate random user names you can use gpw:

This package generates pronounceable passwords. It uses the statistics of three-letter combinations (trigraphs) taken from whatever dictionaries you feed it.

Generate 7 passwords (user names) of length 13:

geek@liv-inspiron:~$ gpw 7 13
sreepoidahsas
risadiestinge
ntodynesssine
deodstestress
natinglumperm
riasigentspir
enderiferback

For brew users: https://formulae.brew.sh/formula/pwgen

To generate a random password you can use pwgen:

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.

Generate 7 passwords of length 13:

geek@liv-inspiron:~$ pwgen 13 7
Eu7Teadiphaec giepahl3Oyaiy iecoo9Aetaib4 phaiChae6Eivi athoo3igee8Co
Iphu4ufeDeelo aesoYi2lie9he 

As mentioned in the comments, you can avoid reducing entropy by using the -s argument (i.e. generate more secure, completely random but hard to remember passwords):

geek@liv-inspiron:~$ pwgen -s 13 7
eAfycrPlM4cYv 4MRXmZmyIVNBp D8y71iqjG7Zq7 FQRHcserl4R8O yRCUtPtV3dsqV
0vJpp2h0OrgF1 QTp7MKtJyTrjz 

For brew users, see here.

To generate random user names you can use gpw:

This package generates pronounceable passwords. It uses the statistics of three-letter combinations (trigraphs) taken from whatever dictionaries you feed it.

Generate 7 passwords (user names) of length 13:

geek@liv-inspiron:~$ gpw 7 13
sreepoidahsas
risadiestinge
ntodynesssine
deodstestress
natinglumperm
riasigentspir
enderiferback

To generate a random password you can use pwgen:

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.

Generate 7 passwords of length 13:

geek@liv-inspiron:~$ pwgen 13 7
Eu7Teadiphaec giepahl3Oyaiy iecoo9Aetaib4 phaiChae6Eivi athoo3igee8Co
Iphu4ufeDeelo aesoYi2lie9he 

As mentioned in the comments, you can avoid reducing entropy by using the -s argument (i.e. generate more secure, completely random but hard to remember passwords):

geek@liv-inspiron:~$ pwgen -s 13 7
eAfycrPlM4cYv 4MRXmZmyIVNBp D8y71iqjG7Zq7 FQRHcserl4R8O yRCUtPtV3dsqV
0vJpp2h0OrgF1 QTp7MKtJyTrjz 

To generate random user names you can use gpw:

This package generates pronounceable passwords. It uses the statistics of three-letter combinations (trigraphs) taken from whatever dictionaries you feed it.

Generate 7 passwords (user names) of length 13:

geek@liv-inspiron:~$ gpw 7 13
sreepoidahsas
risadiestinge
ntodynesssine
deodstestress
natinglumperm
riasigentspir
enderiferback

To generate a random password you can use pwgen:

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.

Generate 7 passwords of length 13:

geek@liv-inspiron:~$ pwgen 13 7
Eu7Teadiphaec giepahl3Oyaiy iecoo9Aetaib4 phaiChae6Eivi athoo3igee8Co
Iphu4ufeDeelo aesoYi2lie9he 

As mentioned in the comments, you can avoid reducing entropy by using the -s argument (i.e. generate more secure, completely random but hard to remember passwords):

geek@liv-inspiron:~$ pwgen -s 13 7
eAfycrPlM4cYv 4MRXmZmyIVNBp D8y71iqjG7Zq7 FQRHcserl4R8O yRCUtPtV3dsqV
0vJpp2h0OrgF1 QTp7MKtJyTrjz 

To generate random user names you can use gpw:

This package generates pronounceable passwords. It uses the statistics of three-letter combinations (trigraphs) taken from whatever dictionaries you feed it.

Generate 7 passwords (user names) of length 13:

geek@liv-inspiron:~$ gpw 7 13
sreepoidahsas
risadiestinge
ntodynesssine
deodstestress
natinglumperm
riasigentspir
enderiferback

For brew users: https://formulae.brew.sh/formula/pwgen

To generate a random password you can use pwgen:

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.

Generate 7 passwords of length 13:

geek@liv-inspiron:~$ pwgen 13 7
Eu7Teadiphaec giepahl3Oyaiy iecoo9Aetaib4 phaiChae6Eivi athoo3igee8Co
Iphu4ufeDeelo aesoYi2lie9he 

To generate random user names you can use gpw:

This package generates pronounceable passwords. It uses the statistics of three-letter combinations (trigraphs) taken from whatever dictionaries you feed it.

Generate 7 passwords (user names) of length 13:

geek@liv-inspiron:~$ gpw 7 13
sreepoidahsas
risadiestinge
ntodynesssine
deodstestress
natinglumperm
riasigentspir
enderiferback

To generate a random password you can use pwgen:

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.

Generate 7 passwords of length 13:

geek@liv-inspiron:~$ pwgen 13 7
Eu7Teadiphaec giepahl3Oyaiy iecoo9Aetaib4 phaiChae6Eivi athoo3igee8Co
Iphu4ufeDeelo aesoYi2lie9he 

As mentioned in the comments, you can avoid reducing entropy by using the -s argument (i.e. generate more secure, completely random but hard to remember passwords):

geek@liv-inspiron:~$ pwgen -s 13 7
eAfycrPlM4cYv 4MRXmZmyIVNBp D8y71iqjG7Zq7 FQRHcserl4R8O yRCUtPtV3dsqV
0vJpp2h0OrgF1 QTp7MKtJyTrjz 

To generate random user names you can use gpw:

This package generates pronounceable passwords. It uses the statistics of three-letter combinations (trigraphs) taken from whatever dictionaries you feed it.

Generate 7 passwords (user names) of length 13:

geek@liv-inspiron:~$ gpw 7 13
sreepoidahsas
risadiestinge
ntodynesssine
deodstestress
natinglumperm
riasigentspir
enderiferback