How can I pass argument????

[Blue]

dear;   I test openssl for CA by write script exec command  manage CA by perl ('exec').   But I have problem when I use 'openssl -req -new ' .Because when I key  ' openssl req -new -key rsa.key -out cert.cer -passin pass:password ' next have promt for input (ex. country,Email,...) Really  I have to get information for user once times (ex. country,Email,...) then process certificat for them.   Question?? 1 How can I pass argument (ex. country,Email,...) in one instruction???? 2 I try find Example but few.Please suggest url fot Ex.   Ps. Sorry for English ,I low skill in english