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Slides null puliya linux basics
This document provides an overview of Linux topics including: 1. It discusses various Linux distributions like Debian, Redhat and file system basics like directories and permissions. 2. It covers important commands like ls, grep, sed and editors like vim. It also summarizes installing software, automation with cronjobs and configuring services like SSH. 3. Finally, it touches on shell scripting basics like variables, conditions and loops to automate tasks. It provides examples of overloading commands and writing custom scripts.
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Slides null puliya linux basics
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- 2. ANANT SHRIVASTAVA Information SecurityConsultant Admin - Dev - Security null + OWASP + G4H and @anantshri Trainer : Blackhat, RuxCon, NullCon, g0s, c0c0n Speaker : Nullcon, c0c0n, ClubHack, RootConf http://anantshri.info Android Tamer Code Vigilant
- 3. WHAT ARE WECOVERING 1. Understanding *nix 2. File System Basics 3. Understanding I/O 4. Basic Commands 5. How to Exit VIM 6. Shell Script basics 7. Automation
- 4. NIX 1. Family ofOS ranging from Unix, Linux, *BSD (FreeBSD, OpenBSD etc) 2. Follow same standards in terms of file systems, directory layout etc
- 5. LINUX 1. Free asin free speech not free beer 2. Everyone can create there own Distro 3. Hanna Montanna Linux and more
- 6. LINUX DISTRIBUTIONS 1. VariousLinux Distributions 2. Debian Based (apt-get / dpkg) 3. RedHat based (yum / rpm) 4. LTS or not
- 7. FILE SYSTEM BASICS 1.Everything is a file 2. File System Layout 3. Standard File system layout 1. / as highest level 2. /etc for all configuration 3. /home : users home folder
- 9. FILE SYSTEM TYPES ext2 Maximumfile size = 16 GB to 2 TB File system size = 2 TB to 32 TB ext3 1. Journaling (Linux Kernel 2.4.15) 2. Maximum file size = 16 GB to 2 TB 3. File system size = 2 TB to 32 TB ext4 1. Starting from Linux Kernel 2.6.19 ext4 2. Maximum file size = 16 GB to 16 TB 3. File system size = 1 EB 1. 1 EB = 1024 PB 2. 1 PB = 1024 TB
- 10. MORE FILE SYSTEMBASIC 1. File System Permissions -rwxrwxrwx 2. Suid bits -rwsrwxrwx 3. sgid bit -rwxrwsrwx 4. sticky bit -rwxrwxrwt 5. First bit can be l,c,b,d,-
- 11. SUDO 1. id 0is omnipotent 2. its suggested not to use root access 3. So how do we do high privilege actions
- 12. STANDARD I/O 1. Input(<) 2. Output (>) 3. Error (2>)
- 13. USEFUL COMMANDS 1. ls,cd, mkdir 2. cut 3. grep 4. sed 5. sort 6. uniq 7. xargs 8. find 9. tr 10. ps 11. screen 12. netstat -lntp 13. file
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- 15. INSTALLING SOFTWARES 1. Debianapt-get install 2. Redhat yum install 3. python pip install 4. ruby gem install 5. npm / nodejs npm install
- 16. MORE USEFUL COMMANDS 1.python -m SimpleHTTPServer Port 2. !! 3. cd ~ 4. cd - 5. mtr 6. mount and format 7. setting environment Variables
- 17. CRONTAB 1. Automate periodicexecution * * * * * * CMD | | | | | | | | | | | +-- Year (range: 1900-3000) | | | | +---- Day of the Week (range: 1-7, 1 standing for Monday) | | | +------ Month of the Year (range: 1-12) | | +-------- Day of the Month (range: 1-31) | +---------- Hour (range: 0-23) +------------ Minute (range: 0-59)
- 18. CONFIGURING SERVICES SSH Configuration file: /etc/ssh/sshd_config
- 19. USING SSH 1. SSHAuthentication 1. Password 2. SSH Key 2. How to Configure SSH Login via Key 3. ~/.ssh/authorized_keys
- 20. SHELL SCRIPT BASICS 1.Shebang 2. $1 $2, $* $@ $0 3. read 4. echo 5. cat 6. Conditions 7. Loop 8. Expansion {}
- 21. WRITING CUSTOM SCRIPTS 1.Write a shell script to calculate simple interest 2. Write a shell script to check whether no is even or odd 3. Print prime numbers from 1 to 5000
- 22. OVERLOAD COMMANDS 1. alias 2.Why alias and why not 3. find location add path before everything else and then overload
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