Shell commands

1. ls

2. pwd

3. cal

4. time

5. date

6. ps -e

7. ps -ef

8. ps -eF

9. ps -ely

10. lsof -p $$

11. ALT .

12. CTRL l

13. CTRL u

14. CTRL k

15. CTRL c

16. CTRL z

17. CTRL R

18. CTRL T

    1. type -a->Find out if ls is builtin or external command

    2. yum search shell / apt-cache search shell

    3. cat /etc/shells--Pathnames of valid login shells

    4. which bash--to display the full path of (shell) commands

    5. chmod +x hello.sh---set execute permission

    6. ./hello.sh--------------Running Your Script

    7. #!--used in scripts to indicate an interpreter for execution under Linux OS

    8. #!/bin/bash-----------script starts with it

19. while loop

            while [  condition ];

            do

            #put ur script here

            done

vmstat 3

vmstat -m Memory Utilization

vmstat -a Active / Inactive Memory Pages

w username who is loges in for what

uptime

ps -Al/ps -elps -A/e

ps -AlF

ps -AlFH threads

ps -AlLm threads after processes

ps -ejH process tree

ps -eo euser,ruser,suser,fuser,f,comm,label security information

ps -U nandan -u nandan u : process run by nandan

ps -auxf | sort -nr -k 4 | head -10 top 10 memory consumer

ps -auxf | sort -nr -k 3 | head -10 top 10 cpu consumer

free displays the total amount of free and used physical and swap memory

iostat report statistics

mpstat -P ALL    activity of each processor