line numbers

Iptables: Unblock / Delete an IP Address Listed in IPtables Tables

by Vivek Gite on January 23, 2009 · 2 comments

Q. I am a brand new user of a Linux iptables and I can’t find how to instruct my iptables to delete or unblock an IP address listed in iptables firewall. I’m using Debian Linux version. Can you help please?

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How To Show Line Numbers In vi / vim Text Editor

by Vivek Gite on May 12, 2008 · 17 comments

How do I display vi / vim text editor line numbers while writing a shell script or c program? How can I turn on or off this feature?

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Shell Script To Number Lines Of Files

by Vivek Gite on April 18, 2008 · 10 comments

How do I number each line to a text file? How do I write a shell script to display text file with line numbers added?

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vi / vim Print Line Numbers on Hardcopies / Printer

by Vivek Gite on April 12, 2008 · 4 comments

Q. How do I print line numbers on printer for my c / java code written using vi / vim text editor under Linux / UNIX operating system?

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UNIX / Linux: vi / vim perform search and replace operation

by Vivek Gite on July 30, 2007 · 14 comments

Q. I’ve just installed CentOS Linux server and started to use vi text editor to make changes to config files. How do I perform search and replace operation using vi / vim text editor? A. vi (vim) is not difficult to learn, the vi editor is well known and used for both writing code and [...]

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Linux Firewall: Display Status and Rules of Iptables Firewall

by Vivek Gite on June 17, 2007 · 0 comments

Q. How do I display / list all rules in the selected chain? How do I find out which rules are active? What is blocked and opened with my firewall? A. To List all rules in the selected chain use the -L option. If no chain is selected, all chains are listed. As every other [...]