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1 2 3 4 5 create table dept( deptno number(2,0) constraint dept_deptno_pk primary key constraint dept_deptno_ck check (deptno between 10 and 90), dname varchar2(20) constraint dept_dname_nn not null); create table emp(

If you do not specify a directory to change to, Perl changes to the home directory for the current user Under Unix, this information is derived from the user s entry in the /etc/passwd file, and under NT, it s the home directory defined in the environment variable %HOME% On the Mac, if you do not specify a directory, it simply changes to the current directory (which means that it does nothing!) The function returns false if the function failed, or true if it succeeded:

chdir or die "Couldn't change back to the home directory, $!";

his chapter delves deeper into some issues you might encounter using C#. It covers some topics of interest to the library/framework author, such as style guidelines and XML documentation, and it also discusses how to write unsafe code and how the .NET runtime s garbage collector works.

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6 7 8 9 10 11 12 13 14 15 16 empno number(4,0) constraint emp_empno_pk primary key, ename varchar2(20) constraint emp_ename_nn not null, mgr number (4,0) constraint emp_mgr_fk references emp (empno), dob date, hiredate date, deptno number(2,0) constraint emp_deptno_fk references dept(deptno) on delete set null, email varchar2(30) constraint emp_email_uk unique, constraint emp_hiredate_ck check (hiredate >= dob + 365*16), constraint emp_email_ck check ((instr(email,'@') > 0) and (instr(email,'') > 0)));

Perl does not support a function internally for discovering the current working directory What it does provide, however, is a Cwd module as part of the standard distribution:

.

use Cwd; print getcwd(),"\n";

The method used to discover the current working directory is basically the one that works on your system In practice, most OSs support a getcwd function; others support a pwd command that returns the current directory The Cwd module simply chooses the one that works each time getcwd is called For security reasons, it can sometimes be necessary to create your own directory structure that contains a reduced set of devices and utilities, or you may want to restrict a user-defined function or process to a similar environment Under Unix, you also have the ability to change the root directory the directory from which all / references are taken This is not implemented under either the Mac OS or Windows versions By changing the root of the current process to another directory, such as /etc/miniroot, you can guarantee that a call to a program of the form /sbin/shutdown actually executes /etc/miniroot/sbin/shutdown The user may be unaware of the restricted directory structure and will be unable to access any directories above the one configured as the new root For example, here s a line taken from a Perl-based web server Without the restriction of the chroot function, it would be possible for a cracker to access the web page /etc/passwd not the level of access we want to provide

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