In UNIX,shell is a very strong and most important tool.
When you login to UNIX , a shell executes and you see a login prompt, this shell can be a bourne shell , a POSIX shell, etc (depending on the versions of UNIX) i.e. for LINUX it is a bourne shell.
When a user types a username , a password prompty comes and when user types a password ,the entry is matched with the preentry made in file /etc/passwd .
Now if the entry matches the user successfully get loged in but if the password doesnt match the GETTY program takes over and we get a new login prompt untill you made a true entry.
Thats all for the unix shell scripts used while the user makes a login.For more such informations give a like to our facebook page and leave your valuable comments too.
Engineer's World 
Fantastique soir à chacun des participants de cette assemblée ,
Pour débuter , donnez-moi l’opportunité de vous montrer ma gratitude pour toutes les formidables informations que j’ai retrouvées sur cet impressionnant forum de discussions .
Je ne suis pas sure d’être au meilleur section mais je n’en ai pas trouvé de meilleur.
J’habite à Elgin, canada . J’ai 36 années et j’éduque 5 agréables enfants qui sont tous âgés entre 11 ou 14 années (1 est adoptée ). J’adore beaucoup les animaux et je fais de mon mieux de leur offrir les accessoires qui leur rendent la vie plus splendide.
Je vous remercie d’avance pour toutes les super discussions à venir et je vous remercie de votre compassion pour mon français moins qu’idéal : ma langue maternelle est le vietnamien et je fais de mon mieux de m’enseigner mais c’est très ardu !
A une autre fois
Carry
ENGLISH TRANSLATION:
Great evening to all participants of this meeting,
To start, give me the opportunity to show you my gratitude for all the wonderful information I found on this impressive forum threads.
I’m not sure to be the best section but I have not found a better place.
I live in Elgin, Canada. I educate my 36 years and five children who are nice all aged between 11 and 14 years (1 is adopted). I love animals very much and I do my best to provide them with accessories that make life more beautiful.
Thank you in advance for all the great discussions coming and thank you for your compassion for my French less than ideal: my native language is Vietnamese and I do my best to teach me but it is very difficult !
At another time
Carry
Merci ‘carry’ pour vos commentaires.
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