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May 26 2010

shflags - Project Hosting on Google Code

Shell Flags (shFlags) is a library written to greatly simplify the handling of command-line flags in Bourne based Unix shell scripts (bash, dash, ksh, sh, zsh) on many Unix OSes (Linux, Solaris, Mac OS X, etc.).

Most shell scripts use getopt for flags processing, but the different versions of getopt on various OSes make writing portable shell scripts difficult. shFlags instead provides an API that doesn't change across shell and OS versions so the script writer can be confident that the script will work.

March 30 2010

The TCP/IP Guide - DNS Message Header and Question Section Format

The client/server information exchange in DNS is facilitated using query/response messaging. Both queries and responses have the same general format, containing up to five individual sections carrying information. Of these, two are usually found in both queries and responses: the Header section and the Question section. I will start exploring the detailed format of DNS messages by looking at these two sections; the next topic will cover the resource record formats used by servers for the other three message sections.
Tags: DNS flags
Reposted bysicksin sicksin
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