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EXPIRED This indicates that the password lifetime has expired Passwords can have a limited lifetime No user can connect to an EXPIRED account until the password is reset EXPIRED & LOCKED Not only has the account been locked, but its password has also expired EXPIRED (GRACE) This indicates that the grace period is in effect A password need not expire immediately when its lifetime ends; it may be configured with a grace period during which users connecting to the account have the opportunity to change the password LOCKED (TIMED) This indicates that the account is locked because of failed login attempts An account can be configured to lock automatically for a period after an incorrect password is presented a certain number of times EXPIRED & LOCKED (TIMED) EXPIRED (GRACE) & LOCKED EXPIRED (GRACE) & LOCKED (TIMED) To lock and unlock an account, use these commands:

1:

ALTER USER username ACCOUNT LOCK ; ALTER USER username ACCOUNT UNLOCK ;

when compared to the file manipulation and management functions found in Perl However, some advantages awk has over Perl are summarized here: I awk is simpler, and the syntax is more structured and regular I Although it is gaining acceptance, Perl has yet to be included as standard with many operating systems Awk has been supplied with Unix almost since it was first released I awk can be smaller and therefore much quicker to execute for small programs I awk supports more advanced regular expressions You can use a regular expression for replacement, and you can search text in substitutions

The special * format character tells Perl to accept the corresponding argument as the separating character in lieu of the period, so we could print out an Ethernet address using

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To force a user to change their password, use this command:

printf "Ethernet address: %*vX\n", %addr;

1. This works because you have no way to add files in this interface, which requires rewalking the baseline tree to check for a corresponding baseline file (or directory).

ALTER USER username PASSWORD EXPIRE;

Using the standard read and print functions can cause problems if you want to access fixed blocks of data that are not separated by a recognizable record or if you want to avoid the problems associated with buffered input In particular, this can cause delayed reads and writes, and, overall, make the system seem inefficient compared to a direct access system To get around this, you can use the sysread and syswrite functions, which emulate the underlying fread and fwrite functions They read and write a block of data of a specified size, ignoring the usual field and record boundaries of the <FILEHANDLE> operator and the read and print functions

This will immediately start the grace period, forcing the user to make a password change at their next login attempt (or one soon after) There is no such command as alter unexpire The only way to make the account fully functional again is to reset the password

The sysread function reads a fixed number of bytes from a specified filehandle into a scalar variable:

If OFFSET is specified, then data is written to SCALAR from OFFSET bytes, effectively appending the information from a specific point If OFFSET is negative, data is written from the number of bytes specified counted backward from the end of the string The function is based on the system read() function, and therefore it avoids the normal buffering supported by standard streams-based stdio functions

A user account must have an authentication method: some means whereby the database can determine if the user attempting to create a session connecting to the account is allowed to do so The simplest technique is by presenting a password that will be matched against a password stored within the database, but there are alternatives The possibilities are Operating system authentication Password file authentication Password authentication External authentication Global authentication

The syswrite function is the exact opposite of sysread It writes a fixed-sized block of information from a scalar to a filehandle:

The first two techniques are used only for administrators; the last requires an LDAP directory server The LDAP directory server may be the Oracle Internet Directory, shipped as a part of the Oracle Application Server

If OFFSET has been specified, then LENGTH bytes are read from the SCALAR and written to FILEHANDLE If the length of the scalar is less than LENGTH, the data is padded with nulls

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