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MySQL: Change Default Port Under Linux / UNIX

Q.I'm using MySQL 5 under Red Hat Enterprise Linux 5. How do I change default mysql server port (tcp port 3306) under Linux or UNIX operating systems?
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Q. I've installed Postgresql under Red Hat Enterprise Linux 5.x server. I've created username / password and database. But when I try to connect it via PHP or psql using following syntax:

psql -d myDb -U username -W

It gives me an error that read as follows:

psql: FATAL: Ident authentication failed for user "username"

How do I fix this error?
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Q. I've made changes / updates to my /etc/inittab file to configure init process to start with agetty. init reads the /etc/inittab configuration file at the time of system boot. How do I re-read this file without rebooting my Linux server?
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Q. How do I install sar command under FreeBSD to collect, report, or save system activity information? How can I setup freebsd accounting?
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How can I set a subscription number in a Kickstart file in Red Hat Enterprise Linux 5?
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Setting Up a CentOS / Red Hat Linux DHCP Client

Q. How do I setup my Red Hat / CentOS / Fedora Linux system to get IP address and other information via a DHCP server for eth0 interface?
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Can you tell me an exact location of Linux kernel driver under Linux file system? Where to find all available modules under Linux operating systems?
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