BowerStudios.com

To see the top of a file:
head -n 100 filename

Count the number of lines in a file:
wc -l filename

Truncate (empty) a file:
truncate -s 0 filename

To see the directory layout in a recursive layout:
tree

I started working on a library to edit Apache 2 Authentication files (the dbm format) with Groovy.
You can find it on github.com

Unfortunately, it requires JNI to get the job done.
On Ubuntu 10.10, this entails:
sudo apt-get install libdb4.8-java
cp /usr/share/java/libdb4.8-java-4.8.30.jar /path/to/app/using/berkeley/db

Some References:

• Old link from apacheweek, still relevant
• A nice workflow for password recovery at:kornr.net
• Working with Berkeley db cursors
• The Berkeley db java api
• More java api
• Something that gave me a clue about how to compile/use berkeley db with java

As a bonus, there is some code examples about working with Berkeley db's for Perl and Ruby in the documentation directory. Since they are not abstracted away from the os like any jvm language, their access to Berkeley db's is much simpler. Apache's tool for managing the dbm file, dbmmanage is written in Perl.

From Unix.com
shell:
# head -100 oldfile > newfile

vi:
# vi oldfile
:1,100 w newfile

Giving gvoice-notifier a whirl right now, looks promising.

I noticed on omgubuntu.co.uk

Base Unix Commands

On Youtube by kenherbin

• Input/Output Redirection in Unix
• Unix Quick Ref
• Unix Exit Status
• Redirect output to syslog
• Rotate log files with logrotate

Interesting command line program of the day

gnome-open: Open a document using the default program:

Examples at embraceubuntu.com

The Bash Beginners Guide

For the most part, Splunk is pretty easy to setup.

I had one issue with the start script not generating appropriately, so here is a copy, just put it in /etc/init.d/splunk:
#!/bin/sh
#
# /etc/init.d/splunk
# init script for Splunk.
# generated by 'splunk enable boot-start'.
#
RETVAL=0
splunk_start() {
echo Starting Splunk...
/bin/su splunk -c '/opt/splunk/bin/splunk start --no-prompt --answer-yes'
RETVAL=$?
}
splunk_stop() {
echo Stopping Splunk...
/bin/su splunk -c '/opt/splunk/bin/splunk stop'
RETVAL=$?
}
splunk_restart() {
echo Restarting Splunk...
/bin/su -c '/opt/splunk/bin/splunk restart'
RETVAL=$?
}
splunk_status() {
echo Splunk status:
/bin/su splunk -c '/opt/splunk/bin/splunk status'
RETVAL=$?
}
case "$1" in
start)
splunk_start
;;
stop)
splunk_stop
;;
restart)
splunk_restart
;;
status)
splunk_status
;;
*)
echo "Usage: $0 {start|stop|restart|status}"
exit 1
;;
esac
exit $RETVAL


A walkthrough on setting up splunk with grails at Lazygun.net