Frequently Asked Questions About Linux / UNIX » Linux / UNIX File Formats http://www.cyberciti.biz/faq Every answer asks a more beautiful question. Fri, 03 Feb 2012 22:38:32 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 DenyHosts: Remove / Delete an IP addresshttp://www.cyberciti.biz/faq/linux-unix-delete-remove-ip-address-that-denyhosts-blocked/ http://www.cyberciti.biz/faq/linux-unix-delete-remove-ip-address-that-denyhosts-blocked/#comments Mon, 17 Aug 2009 20:25:17 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=4844 I've followed your guide and installed denyhosts to protect on my RedHat 5.3 OpenSSH based server. However, I've been accidentally blocked out from my home ADSL IP address. I tried removing my blocked IP from /etc/hosts.deny, but it did blocked it again quickly. It appears that DenyHosts keeps track of the attempts somewhere on disk or memory. How do I remove my own home IP address from DenyHosts?]]> http://www.cyberciti.biz/faq/linux-unix-delete-remove-ip-address-that-denyhosts-blocked/feed/ 9 Ubuntu Linux: Firefox and Desktop Application Fix Smooth Font Problem ( Render Font Correctly )http://www.cyberciti.biz/faq/gnome-linux-firefox-smooth-fonts/ http://www.cyberciti.biz/faq/gnome-linux-firefox-smooth-fonts/#comments Thu, 23 Oct 2008 18:34:22 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2224 Q. How do I render font smoothly in Ubuntu Linux / Gnome desktop systems? How do I get look a likes of the Microsoft / Mac OS X smooth fonts for Firefox and other applications?]]> http://www.cyberciti.biz/faq/gnome-linux-firefox-smooth-fonts/feed/ 10 Linux: Find Out If a Particular Driver / Feature Compiled Into Running Kernel or Nothttp://www.cyberciti.biz/faq/linux-kernel-driver-feature-compiled/ http://www.cyberciti.biz/faq/linux-kernel-driver-feature-compiled/#comments Fri, 10 Oct 2008 08:14:20 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=2149 Q. I know how to find out information about compiled driver under FreeBSD kernel. But, how do I find out if a Particular feature, driver or filesystem support is compiled into my running Linux kernel or not? How do I find out if DMA support is compiled into my kernel?]]> http://www.cyberciti.biz/faq/linux-kernel-driver-feature-compiled/feed/ 0 How To Select Best Linux Desktop Applicationhttp://www.cyberciti.biz/faq/so-many-linux-application-for-single-task/ http://www.cyberciti.biz/faq/so-many-linux-application-for-single-task/#comments Tue, 23 Sep 2008 03:14:52 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1867 Q. I'm new to GNU/Linux world and a single query (apt-cache search office or yum search 'office') shows so many application for a single task such as network monitoring or office applications. The number of apps choices just confusing. How do you select application from so many choices?]]> http://www.cyberciti.biz/faq/so-many-linux-application-for-single-task/feed/ 0 FreeBSD csh / tcsh: Export Shell Variablehttp://www.cyberciti.biz/faq/freebsd-how-to-export-shell-variable/ http://www.cyberciti.biz/faq/freebsd-how-to-export-shell-variable/#comments Tue, 02 Sep 2008 09:52:44 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1619 Q. I'm using FreeBSD 7 with csh (tcsh) shell. How do I export shell variable under FreeBSD operating systems?]]> http://www.cyberciti.biz/faq/freebsd-how-to-export-shell-variable/feed/ 2 pdfimages: Extract and Save Images From A Portable Document Format ( PDF ) Filehttp://www.cyberciti.biz/faq/easily-extract-images-from-pdf-file/ http://www.cyberciti.biz/faq/easily-extract-images-from-pdf-file/#comments Thu, 28 Aug 2008 20:36:11 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1563 Q. How do I extract images from a PDF file under Linux / UNIX shell account?]]> http://www.cyberciti.biz/faq/easily-extract-images-from-pdf-file/feed/ 4 BASH: Prepend A Text / Lines To a Filehttp://www.cyberciti.biz/faq/bash-prepend-text-lines-to-file/ http://www.cyberciti.biz/faq/bash-prepend-text-lines-to-file/#comments Sat, 23 Aug 2008 09:31:46 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1492 Q. I can append text to a file using >> operator but how do I prepend a text to a file? I want the opposit of >> operation?]]> http://www.cyberciti.biz/faq/bash-prepend-text-lines-to-file/feed/ 28 psql: FATAL: Ident authentication failed for user "username" Error and Solutionhttp://www.cyberciti.biz/faq/psql-fatal-ident-authentication-failed-for-user/ http://www.cyberciti.biz/faq/psql-fatal-ident-authentication-failed-for-user/#comments Tue, 19 Aug 2008 12:56:32 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1464 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?]]> http://www.cyberciti.biz/faq/psql-fatal-ident-authentication-failed-for-user/feed/ 19 Red Hat Linux Static Routing Configurationhttp://www.cyberciti.biz/faq/redhat-centos-fedora-linux-static-routing/ http://www.cyberciti.biz/faq/redhat-centos-fedora-linux-static-routing/#comments Sun, 17 Aug 2008 11:23:59 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1448 Q. I've two network interface connected to two different routers as follows:
[a] eth0 LAN network 10.0.0.0/8 - gateway IP - 10.8.2.65

[b] eth1 ISP assigned network 202.54.22.128/28 - gateway IP - 202.54.22.129
I can only ping to public server but not to another servers inside LAN? I'm not able to route traffic via 10.8.2.65. How do I configure static routing under Red Hat Enterprise Linux 5.x or CentOS Linux 5.2?]]> http://www.cyberciti.biz/faq/redhat-centos-fedora-linux-static-routing/feed/ 6 Ubuntu Linux Disable control-alt-delete [CTRL-ALT-DEL] Emergency Keypress Handlinghttp://www.cyberciti.biz/faq/ubuntu-linux-disable-ctrl-alt-del-keys/ http://www.cyberciti.biz/faq/ubuntu-linux-disable-ctrl-alt-del-keys/#comments Tue, 13 May 2008 13:13:00 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1477 http://www.cyberciti.biz/faq/ubuntu-linux-disable-ctrl-alt-del-keys/feed/ 4 Understanding /var/account/pacct OR /var/account/acct – Acct File Formathttp://www.cyberciti.biz/faq/linux-unix-bsd-varaccountpacct-or-varlogaccountpacct-file/ http://www.cyberciti.biz/faq/linux-unix-bsd-varaccountpacct-or-varlogaccountpacct-file/#comments Thu, 27 Mar 2008 10:16:01 +0000 Vivek Gite http://www.cyberciti.biz/faq/?p=1152 http://www.cyberciti.biz/faq/linux-unix-bsd-varaccountpacct-or-varlogaccountpacct-file/feed/ 0 Understanding /etc/group Filehttp://www.cyberciti.biz/faq/understanding-etcgroup-file/ http://www.cyberciti.biz/faq/understanding-etcgroup-file/#comments Sat, 25 Feb 2006 00:20:00 +0000 nixcraft http://www.cyberciti.biz/faq/faq/understanding-etcgroup-file.php Can you explain me the format of /etc/group user group file under Linux / UNIX operating systems?]]> http://www.cyberciti.biz/faq/understanding-etcgroup-file/feed/ 16 Understanding /etc/passwd File Formathttp://www.cyberciti.biz/faq/understanding-etcpasswd-file-format/ http://www.cyberciti.biz/faq/understanding-etcpasswd-file-format/#comments Wed, 22 Feb 2006 00:09:00 +0000 Vivek Gite http://www.cyberciti.biz/faq/faq/understanding-etcpasswd-file-format.php Q. Can you explain /etc/passwd file format for Linux and UNIX operating systems?]]> http://www.cyberciti.biz/faq/understanding-etcpasswd-file-format/feed/ 75