Sumit Das Tech Notes

Check bash shell script user & usage Check bash shell script user & usage Saturday, September 26, 20158:52 AMBash script display usage and check userSometimes it is needed to check what user is executing the bash script and whether the user supplied al...

Check bash shell script user & usage Saturday, September 26, 20158:52 AMBash script display usage and check userSometimes it is needed to check what user is executing the bash script and whether the user supplied all required arguments:#!/bin/bash di...

Tar Folder Friday, September 11, 20159:36 PMTar -cvf -C ./ . 9/11/2015 9:36 PM - Screen Clipping Created with Microsoft OneNote 2013.

Copy folder recursively, excluding some folders - Stack Overflow Copy folder recursively, excluding some folders - Stack Overflow Tuesday, August 25, 20154:23 PM Use rsync: rsync -av --exclude='path1/to/exclude' --exclude='path2/to/exclu...

Usage of tcpdump » Linux by Examples Usage of tcpdump » Linux by Examples Wednesday, August 12, 201512:23 PM This post will only covers the fundamental of tcpdump usage, bare in mind tcpdump can do much much more than what I illustrate here.Lets start...

Usage of tcpdump » Linux by Examples Wednesday, August 12, 201512:23 PMThis post will only covers the fundamental of tcpdump usage, bare in mind tcpdump can do much much more than what I illustrate here.Lets start with capturing packets based on netwo...

Port is open or closed on UNIX? - Stack Overflow Port is open or closed on UNIX? - Stack Overflow Wednesday, August 05, 20152:23 PM Try (maybe as root)lsof -i -Pand grep the output for the port you are looking for.For example to check for port 80 dolso...

How to add a character on every line in vi editor How to add a character on every line in vi editor Saturday, August 01, 20153:22 AM 05-15-2008, 05:08 AM #2ilikejamSenior MemberContributing Member Registered: Aug 2003Location: GlasgowDistribution: Fed...

Bash Shell: Display All Hidden Dot Files In a Directory Bash Shell: Display All Hidden Dot Files In a Directory Saturday, August 01, 20153:12 AM ≡ MenuTutorialsBASH ShellTroubleshootingNginxNetworkingMySQLGoogle Cloud PlatformAmazon Cloud ComputingRac...

String Comparison Description Str1 = Str2 Returns true if the strings are equal Str1 != Str2 Returns true if the strings are not equal -n Str1 Returns true if the string is not null -z Str1 Returns true if the string is null Numeric Compariso... http://codewiki.wikidot.com/shell-script:if-else