Blogging All About BSDs

I need to do router or network switch configuration via a console port such as COM1 (ttyS0 under Linux). How do I use the screen command for a serial terminal emulator network with different baud rates under UNIX or Linux operating systems?

I know how to use rsync for Unix systems which synchronizes files and directories from one location to another while minimizing data transfer. However, I would like to synchronizing files between two directories, either on one computer, or between a computer and another server. How do I maintain the same version of files on multiple servers?

I'm going to upgrade my FreeBSD 7.x server hard disks and going to send back the original 73GB hard disk to my vendor. I wanted to make sure that no one should able to use my personal data from old hard disk, especially files stored in /home/you/projects directory. I know how to use sDelete under MS-Windows to delete a

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I'm trying to set 'thread_concurrency to 8 under Linux MySQL server. But when I try to restart the mysql server, I get the following error:

[ERROR] /usr/local/libexec/mysqld: unknown variable 'thread_concurrency=8'

How do I fix this problem?

I want find out if a command exists on UNIX from a bash shell script. If command does not exists, then I would like to display an error message on screen. How do I find out if a command exists on Posix system or not?

How do I display my current path settings under Linux / FreeBSD / OpenBSD / NetBSD / Apple OS X / UNIX like operating systems using bash or ksh or csh / tcsh shell?

The virsh command can be used to mange local or remote guest operating systems. The program can be used to create, pause, and shutdown domains. It can also be used to list current domains.

I'd like to make / file system backup but the problem is there are other file systems mounted under / such as:

/mnt/cdrom
/mnt/nfs
/iscsi
/boot
/var

I'd like to skip all other file systems mounted at / and only make backup of local / and not /boot, /var, /iscsi, and /mnt/cdrom etc. How do I force tar to

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How do I add multiple IPv4 / Ipv6 inside jail?

I've typed ldconfig -v (Linux like command) under FreeBSD 7.1_P4_64 bit to get list of directories used by system. But I lost all my configuration and getting shared object not found errors for almost all commands such as vim or bash and so on. How do I fix this problem without rebooting the system?

How do I find and/or monitor disk space in your ZFS storage pool and file systems under FreeBSD or Solaris / OpenSolaris UNIX operating systems?

Q. How do I configure PHP as FastCGI under FreeBSD Nginx webserver?

Q. Some of my programs and scripts needs a real path and not a a symbolic link. How to I determine a real path of any directory under Linux / UNIX operating systems? How do I remove references to /./, /../ and extra '/' character in path?

Q. I'd like to save disk space for my FreeBSD 7 ISP server. We run webserver, nameserver from various jails under powerful HP RAID 10 server. How do I export /usr/ports from host to each jail hosted on /jail/ volume such as /jail/www, /jail/ns, /jail/sql etc?

Q. I've installed Apache 2.2 from FreeBSD 7.0 ports and when I try to start I get following warning on screen:

Performing sanity check on apache22 configuration: Syntax OK Starting apache22. [Wed Sep 17 22:01:58 2008] [warn] (2)No such file or directory: Failed to enable the 'httpready' Accept Filter

How do I fix this error?

Q. I've installed Apache2 and mod_security21 under FreeBSD. Whenever I try to restart apach22 process I get following error:

Cannot load /usr/local/libexec/apache22/mod_security2.so into server: /usr/local/libexec/apache22/mod_security2.so

How do I fix this problem?