Guru Of Geeks

​ ​1. Linux Command Line Linux Reference Card - Great reference published on FOSSwire website One page Linux Manual - Great one page reference to the most popular Linux commands Unix Tool Box - An incredibly exhaustive reference for all things Linux. Treebeard's Unix Cheat Sheet - A great reference with Dos comparisons Terminal Shortcuts - Cheat sheet for the most common terminal shortcuts More Terminal Shortcuts - More shortcuts for history and X 2. Linux Security Linux Security Quick Reference Guide - An awesome security checklist reference IP Tables - If you are interested in Linux firewalls this is a must have TCPDump - Great cheat sheet to an awesome security tool Wireshark Filters - An awesome list of filters for the best packet sniffing utility IP Access Lists - Cheat sheet for IP Access Lists Common Ports - In case you don't have all common ports memorized netcat - Reference to the swiss army knife of networking 3. Linux Administration ...

​ ​ ​Install sSMTP Debian/Ubuntu users can Install with this command or click here to open up apt : sudo apt-get install ssmtp We need to then need to edit, ' /etc/ssmtp/ssmtp.conf' : root= username@gmail.com mailhub= smtp.gmail.com:587 rewriteDomain= hostname= username@gmail.com UseSTARTTLS=YES AuthUser=username AuthPass=password FromLineOverride=YES Then add each account that you want to be able to send mail from by editing, ' /etc/ssmtp/revaliases ': root:username@gmail.com:s mtp.gmail.com:587 localusername:username@gmail.com:s mtp.gmail.com:587 Now try sending an email You can send an email through your favorite email client, like ' mutt ', or type: sudo ssmtp someemail@email.com You will then type your message, hit enter and ' ctrl+d ' Now that you have a simple outgoing email server setup, you can do all sorts of neat things: Configure cron jobs to send log reports to your email address Ale...

The Linux Audit Daemon is a framework to allow auditing events on a Linux system. Within this article we will have a look at installation, configuration and using the framework to perform Linux system and security auditing. Auditing goals By using a powerful audit framework, the system can track many event types to monitor and audit the system. Examples include: Audit file access and modification See who changed a particular file Detect unauthorized changes Monitoring of system calls and functions Detect anomalies like crashing processes Set tripwires for intrusion detection purposes Record commands used by individual users Components The framework itself has several components: Kernel: audit : hooks into the kernel to capture events and deliver them to auditd Binaries: auditd : daemon to capture events and store them (log file) auditctl : client tool to configure auditd audispd : daemon to multiplex events aureport : reporting tool which reads from log file ...

​The audit service is provided for system auditing. Under its default configuration, auditd has modest disk space requirements, and should not noticeably impact system performance. The audit service, configured with at least its default rules, is strongly recommended for all sites, regardless of whether they are running SELinux. In this post, i will share with you the basic steps to install and configure auditd on Linux CentOS 6.3. The auditing requirements include : a. Ensure Auditing is Configured to Collect Certain System Events – Information on the Use of Print Command (unsuccessful and successful) – Startup and Shutdown Events (unsuccessful and successful) b. Ensure the auditing software can record the following for each audit event: – Date and time of the event – Userid that initiated the event – Type of event – Success or failure of the event – For I&A events, the origin of the request (e.g., terminal ID) – For events that introduce an object...

Problem(Abstract) Long periods of inactivity can cause DataStage client to lose connection to the remote server. DataStage client leaves the TCP/IP connection in idle state if there is no user activity and this can result in a disconnect Diagnosing the problem It is important to look at the time line to really understand the disconnect behavior. First step is to look at the error DataStage client reported via "view details" button once the error has occurred. Here is an example how idle disconnect might show up in the logs: This error occurred on 18/08/2011 at 10:12 a.m. (Standard format: 2011/08/18 10:12:06) Product Version: 8.5.0.0 Client tag: 55e4885f-76a0-40c0-9ce4-0729db967912 See log: C:\Users\dsadm8\ds_logs\ dstage_wrapper_trace_3.log Application: DSDesign.exe (PID 7501) ... Error message: Error calling subroutine: *DataStage*DSR.ADMIN (Action=38); check DataStage is set up correctly in project dstage1 (The connectio...

​# To get 7th char in a File head -c7 FileName | tail -1 # To get 45th char in a File head -c45 FileName | tail -1 # To get 55th and 56th char in a file head -c56 FileName | tail -2 ​

​ ​ ​Here are the steps to configure ODBC connectivity on linux. Step1)Set ODBCHOME,ODBCINI and PATH env variables. Informatica Admin on Linux: pwadmin I have created infaenv script under /opt/informatica/9.1.0 and called that script in pwadmin .profile. . /opt/informatica/9.1.0/infaenv Below are the env variables we need to set in infaenv script. export ODBCHOME=/opt/informatica/9.1.0/ODBC6.1 export ODBCINI=/home/pwadmin/.odbc.ini export PATH=$PATH:$ODBCHOME/bin export LD_LIBRARY_PATH=/opt/informatica/9.1.0:$ODBCHOME/lib:$LD_LIBRARY_PATH Sample .odbc.ini entry to connect to sybase database. [PUBS2] Driver=/opt/informatica/9.1.0/ODBC6.1/lib/DWase25.so Description=DataDirect 6.1 Sybase Wire Protocol Database=pubs2 NetworkAddress= hmlinux.ukatru.com ,5000 InstallDir=/opt/informatica/9.1.0/ODBC6.1 ​