grep, sed, and awk for fun and profit I recently moved this website to a new website. After doing that, I noticed a lot more captcha failures. I don’t think there are more automated attempts. logcheck on the new server is not configured to ignore the log messages. Tonight, I thought I’d do something about …
Changing the shell for existing users and new users Sometimes you just want a change. Sometimes you want that change to be permanent. And you don’t want to have to make that change again. Changing the shell for all existing users icmpecho gave us this script. To change the shell to bash for all existing …
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Changing your tcsh prompt see also Shells The research for this article was done by Hydro- and huey_ on Undernet’s #FreeBSD IRC channel. man tcsh Hydro- told me where to look. If you want the prompt set each time you login, put the code in either .tcshrc or .login in your home directory. But …
Installing OpenSSH – less restrictive than ssh OpenSSH is now part of the base system of FreeBSD. Don’t bother with this article unless you really want to install the port. In which case, you’ll want to add the following line to /etc/rc.conf sshd_program=”/usr/local/sbin/sshd” This article talks about how I installed OpenSSH. SSH is a secure …
periodic – using it to run shell scripts This article documents how I used periodic to run a shell script every night. What is periodic? From the manual pages for periodic: The periodic program is intended to be called by cron(8) to execute shell scripts located in the specified directory. This program uses files located …
ssh2 – when ssh won’t do [Ed. After this article was written, OpenSSH was released. You should read Installing OpenSSH – less restrictive than ssh instead of this article.] This article was submitted by Nadav Eiron <nadav@cs.technion.ac.il>. My thanks for the help. Note: ssh has quite liberal licensing restrictions. You should read the ssh article …
ssh – much more secure than telnet [Ed. After this article was written, OpenSSH was released. You should read Installing OpenSSH – less restrictive than ssh instead of this article.] This article describes how I installed ssh, the Secure SHell. ssh is free for personal or non-commercial use. Otherwise, you might have to use ssh2. …
nologin – Refuse a login to a user, and make a note of it in syslog A short while ago, I installed mergemaster as part of my 3.1 upgrade. Today I started hunting around /usr/ports/sysutils, found nologin and decided to install it. As the long description of the port says, this is suitable for use …
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screen – how to detach a session from your window This article tells you how to install screen, "a full-screen window manager that multiplexes a physical terminal between several processes (typically interactive shells)" [that quote shamelessly stolen from man screen]. Why use screen? If you are a dialup user, screen will allow you to save …
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Changing your bash prompt see also Shells I’ve decided to change the prompt in my bash shell. That’s the few bits of text that your shell spits at you when it wants something from you. At present, my prompt is: bash-2.02$ Not very exciting. So I decided to change it. man bash genesis– on #freebsd …