FatMin

Roxio Toast Titanium on Mac OS X opening / running very slow - hello DTrace!

If you find Toast is running very slow on your Mac and you've tried all the other fixes, check to make sure you don't have any mounts defined on your Mac as Toast will continue to try and mount them ad nauseum - thereby causing the slowness.  You can check Directory Utility to see if there are mounts you forgot about.

If that's not it, it is time to embrace the built-in DTrace tools Mac has for your computing pleasure.  This can help you track the calls Roxio makes when it's appears to be running dog slow.

Dtruss is very much like truss or strace - it will show you system calls made by whatever you are dtrussing.  If what you are trying to figure out is shortlived, execsnoop is also your friend as it will show you system calls for any new processes as they are spawned.

Dtruss and execsnoop show when Toast starts up that automountd is always called, thus stale NFS mounts could be causing you headaches.

Simple Bash Scripting - Case Statement

For the RHCE test you are probably going to want to know how to write a simple bash script which employs a simple case statement.

Note that the ")" symbol is used to separate the list of selections from the action to be taken. Fall through is done using *, which catches all input that has not been specificed previously. Also ;; acts as a case break. Note that the statement is started with "case" and closed with "esac"

 

    #!/bin/bash

    case "$1" in

        this)  echo "this"
        ;;
        that) echo "that"
        ;;
        *) echo "Type this or that" 2>&1

    esac

 

Using ssh-copy-id to Push SSH key to Authorized Keys

Everywhere I have ever worked we have always used complex scripts to push out id files to enable passwordless authentication from a bastion host. Today I stumbled across ssh-copy-id which is about as easy to use as it gets.

Check out the section below for useage and subsitute your servers hostname where you see <yourhost>

# ssh-copy-id -i ~/.ssh/id_rsa.pub <yourhost>
21
Now try logging into the machine, with "ssh '<yourhost>'", and check in:

  .ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

Checkout the link below for more info

http://www.thegeekstuff.com/2008/11/3-steps-to-perform-ssh-login-without-password-using-ssh-keygen-ssh-copy-id/#more-268

 

 

Shell Script: List all RPMs and their Requirements on RHEL

 The command below is sort of like a fingerprint for a box. It lists all rpms that are installed and the files that are required by those rpms.

rpm -qa | sed -e "s,-[0-9]*\\., ,1" | tee rpm-qa.txt | awk '{print $1}' | xargs rpm -q --requires | sort | uniq | tee rpm-qa-requires.txt

Shell Script: Test SSH Connectivty to a list of boxes

#!/bin/ksh

ERROR=0

for SERVER in `cat server.list`
do
        ssh -n -o Batchmode=yes -o ConnectTimeout=30 -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null $SERVER "uname -n > /dev/null" > /dev/null 2>&1
        if [ $? -ne 0 ]
        then
                echo "FAILED: $SERVER"
                ERROR=1
        else
                echo "SUCCESS: $SERVER"
        fi
done

Shell Scripting - Prompting for User Input.

First off let me start out this post by stating that I am a pretty lousy scripter. I just have not taken the time to write a lot of scripts. So I have created a new Category called "Shell Scripting" and plan to do my best to keep adding little "scriptlets" whenever I can.

Prompting for user input

# echo -n "Enter your name and press [ENTER]:"
# read name
# echo -n "Enter your gender and press [ENTER]:"
# read -n 1 gender (read returns after 1 character is read)
# echo