Shellscripting

#!bin/bash
ls
touch abc
pwd
mkdir folder
df -h 



--------Example 1

#!/bin/bash
echo "This is a shell script"  
ls
echo "I am done running ls command"  

777 

+x or 755 


3rd 


Example Monitoring script  

#!/bin/bash  
echo "This is a shell script"
echo "the hostname of this machine is "
hostname 
hostname -i
ps
echo "memory used in the machine"
free
echo "disk used in the machine "
df -h
echo "the above information from the machine"  



---------

#!/bin/bash
# Add two numeric value
((sum=10-5))
#Print the result
echo $sum



-----------




#!/bin/bash 
echo "Hello there"
echo "My name is $(whoami)"
echo "Nice to meet you"

-----------

Example 5 Get User Input from the command line 


#!/bin/bash
echo "Enter Your email"
read email
echo "Welcome $email to Linux Learning session"


------

Example 1

#!/bin/bash  
SOMEVAR='this is my day-46 of batch-38'  
echo "$SOMEVAR"


----CW

vi file.sh
#!/bin/bash
touch info
date
w
ps
./file.sh > info

Chmod +x file.sh
 
./file.sh > info

-------

Santosh Kumar 9:10


#!/bin/bash
date > info.file
w >> info.file
ps aux >> info.file

date > first time 
>> for apneding

----------

Suresh Dike 9:09
#!/bin/bash

# 1. Get current time and date
echo "Current Date and Time:" > info
date >> info

# 2. List logged-in users
echo -e "\nLogged In Users:" >> info
who >> info

# 3. Show running processes
echo -e "\nRunning Processes:" >> info
ps aux >> info

# 4. Final message
echo "System information saved to 'info' file."


-----------

date > info.txt        

------------

create Shell Script To Display The Running Process

ps

 Running On The System 
 
 Every 30 Seconds For 3 Times Only
 
 execute ps for 3 times in 30 sec gap
 
 ps
 for loop for 3 times 
 sleep 30 
 
 
#!/bin/bash
# Write a shell script to display the process running on the system for every
# 30 seconds, but only for 3 times.
# -------------------------------------------------------------------------
# -------------------------------------------------------------------------
# 
# for loop 3 times
for r in 1 2 3
do
	#see every process on the system
	echo "**************************** x^x^x ****************************"
	ps
	echo "**************************** x^x^x ****************************"
	#sleep for 30 seconds
	sleep 3
        # clean
done



git commit && git push    --                 
git commit || echo 

---------------


#!/bin/bash



# Sample script written for Part 4 of the RHCE series
# This script will return the following set of system information:
# -Hostname information:
echo -e "\e[31;43m***** HOSTNAME INFORMATION *****\e[0m"
hostnamectl
echo ""
# -File system disk space usage:
echo -e "\e[31;43m***** FILE SYSTEM DISK SPACE USAGE *****\e[0m"
df -h
echo ""
# -Free and used memory in the system:
echo -e "\e[31;43m ***** FREE AND USED MEMORY *****\e[0m"
free
echo ""
# -System uptime and load:
echo -e "\e[31;43m***** SYSTEM UPTIME AND LOAD *****\e[0m"
uptime
echo ""
# -Logged-in users:
echo -e "\e[31;43m***** CURRENTLY LOGGED-IN USERS *****\e[0m"
who
echo ""
# -Top 5 processes as far as memory usage is concerned
echo -e "\e[31;43m***** TOP 5 MEMORY-CONSUMING PROCESSES *****\e[0m"
ps -eo %mem,%cpu,comm --sort=-%mem | head -n 6
echo ""
echo -e "\e[1;32mDone.\e[0m"




--------------


echo -e "\e[31;43m***** HOSTNAME INFORMATION *****\e[0m"

\e[0;30m	Black
\e[6;30m	Black  bold 


#!/bin/bash  
echo "This is a shell script"
echo "the hostname of this machine is "
hostname 
hostname -i
ps
echo "memory used in the machine"
free
echo "disk used in the machine "
df -h
echo "the above information from the machine"  


------------

#!/bin/bash
echo "Printing text with newline"
echo -n "Printing text without newline"
echo -e "\nRemoving \t backslash \t characters\n"