10-24-2007
Basic Scipting problem need help for school
How to make this script?
1. Write a portable bash shell script called change_password.bash that will
prompt the user for a password. Use a series of if statements to test if:
1.
The password is NOT 6 or more characters
2.
The password does not contain at least 3 consecutive letters (could be either uppercase or lowercase)
3.
The password does NOT contain any number
4.
The password does NOT contain a non-alphanumeric character (eg. Something not a letter or number.
I can take care of option 1 but have trouble making option 3,2 and 4.
#!/bin/bash
read password
echo $password | wc -m >number
number=`cat number`
if
[ $number -gt 5 ]
then
echo Password cannot contain more then 5 numbers
fi
rm number
for 3 i can only think of this but it wont work for somereason
echo $password | grep [a-zA-z]* >part3
part3=`cat part3`
if [ $part3 != $password ]
then
echo error password cannot contain numbers or special characters
fi
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LEARN ABOUT REDHAT
shadow
SHADOW(5) File Formats Manual SHADOW(5)
NAME
shadow - encrypted password file
DESCRIPTION
shadow contains the encrypted password information for user's accounts and optional the password aging information. Included is
Login name
Encrypted password
Days since Jan 1, 1970 that password was last changed
Days before password may be changed
Days after which password must be changed
Days before password is to expire that user is warned
Days after password expires that account is disabled
Days since Jan 1, 1970 that account is disabled
A reserved field
The password field must be filled. The encryped password consists of 13 to 24 characters from the 64 character alphabet a thru z, A thru
Z, 0 thru 9, . and /. Refer to crypt(3) for details on how this string is interpreted.
The date of the last password change is given as the number of days since Jan 1, 1970. The password may not be changed again until the
proper number of days have passed, and must be changed after the maximum number of days. If the minimum number of days required is greater
than the maximum number of day allowed, this password may not be changed by the user.
An account is considered to be inactive and is disabled if the password is not changed within the specified number of days after the pass-
word expires. An account will also be disabled on the specified day regardless of other password expiration information.
This information supercedes any password or password age information present in /etc/passwd.
This file must not be readable by regular users if password security is to be maintained.
FILES
/etc/passwd - user account information
/etc/shadow - encrypted user passwords
SEE ALSO
chage(1), login(1), passwd(1), su(1), passwd(5), pwconv(8), pwunconv(8), sulogin(8)
AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com)
SHADOW(5)