shell

SDK of Google   gcloud

Service account 

gcloud compute instances create linuxshell --project=march22paid --zone=us-central1-f --machine-type=e2-medium --network-interface=network-tier=PREMIUM,stack-type=IPV4_ONLY,subnet=default --metadata=enable-osconfig=TRUE --maintenance-policy=MIGRATE --provisioning-model=STANDARD --service-account=866304468909-compute@developer.gserviceaccount.com --scopes=https://www.googleapis.com/auth/devstorage.read_only,https://www.googleapis.com/auth/logging.write,https://www.googleapis.com/auth/monitoring.write,https://www.googleapis.com/auth/service.management.readonly,https://www.googleapis.com/auth/servicecontrol,https://www.googleapis.com/auth/trace.append --tags=http-server,https-server --create-disk=auto-delete=yes,boot=yes,device-name=linuxshell,disk-resource-policy=projects/march22paid/regions/us-central1/resourcePolicies/default-schedule-1,image=projects/ubuntu-os-cloud/global/images/ubuntu-2404-noble-amd64-v20250828,mode=rw,size=20,type=pd-balanced --no-shielded-secure-boot --shielded-vtpm --shielded-integrity-monitoring --labels=goog-ops-agent-policy=v2-x86-template-1-4-0,goog-ec-src=vm_add-gcloud --reservation-affinity=any && printf 'agentsRule:\n  packageState: installed\n  version: latest\ninstanceFilter:\n  inclusionLabels:\n  - labels:\n      goog-ops-agent-policy: v2-x86-template-1-4-0\n' > config.yaml && gcloud compute instances ops-agents policies create goog-ops-agent-v2-x86-template-1-4-0-us-central1-f --project=march22paid --zone=us-central1-f --file=config.yaml


NAME: linuxshell
ZONE: us-central1-f
MACHINE_TYPE: e2-medium
PREEMPTIBLE: 
INTERNAL_IP: 10.128.0.20
EXTERNAL_IP: 34.66.166.63
STATUS: RUNNING




5 linux monitoring command's 


exectuable perminisg 

#! bin/bash crated by ratan 
df -h 
free 
ps
uptime
who


is this a Shellcript complete ? for moniring    if run run or not 


Example 1

#!/bin/bash  
echo "This is a shell script created by prakash"  
ls
echo "I am running my first shell script"  
SOMEVAR='this value will be saved in this veriable'  
echo "$SOMEVAR"




Example 2

#!/bin/bash 
echo "Hello batch40 student's"
echo "My name is $(whoami)"
echo "Nice to meet you"




#!/bin/bash 
echo "hostname of my machine is $(hostname)"
echo "current running processes"
ps
echo "current free memory"
free -h
echo "current discspace"
df-h



4th 

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

bodmas


5


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

Example 5 Get User Input from the command line 


#!/bin/bash
echo "Enter Your name"
read name
echo "Welcome $name to Linux Learning session with batch40"


Certifate ?

$name



harsha


>   first time 
>> append next line 


date > info
who >> info
ps >> info


Solution 
#!/bin/bash 
echo "Current Date & time is $(date)" > info
echo "Current user logged in is $(whoami)" >> info
echo "Current running process is $(ps)" >> info

-----------

#!/bin/bash
info_file="~/info.txt"
echo "This is the current date and time in IST" >> $info_file
date >> $info_file
echo "Below are the list of logged in user" >> $info_file
whoami >> $info_file
echo "Below are the currently running proces" >> $infor_file
ps -ef >> $info_file


#!/bin/bash

# Clear the info file if it exists and add a header
echo "--- System Information Report ---" > info
echo "Report generated on: $(date)" >> info
echo "---------------------------------" >> info

# 1) Show the current time and date
echo "### Current Time and Date ###" >> info
date >> info
echo "" >> info # Add a blank line for readability

# 2) List logged-in users
echo "### Logged-in Users ###" >> info
who >> info
echo "" >> info

# 3) Show all running processes
echo "### Running Processes ###" >> info
ps aux >> info
echo "" >> info

echo "Report successfully saved to 'info' file."


write a script to execure ps -   30 times in the duration of 30 sec ?


for i in {1..30}
do
    ps 
    echo "----------------------------------------"
    sleep 10

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

let us C    15 year's 


#!/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 10 seconds
	sleep 10
  
done



i'm   syntex error 

i am 


&&  both condition shoud be correct   


  ||  one condition shoud be correct 
  
  
  
  variable vs function 
  
  x=1
  
  git commit && git push                  
git commit || echo

               def
Functions      get_name()


how to define function 

how to call function  


function()
{
syntax
}

echo $function()



Defining func:

greet_user() {
    echo "Hello, $1!"
    echo "You're in Batch $2."
}

calling func:
# Call the function
greet_user





#!/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"

hostnamectl
df -h
free
uptime
who
ps



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


\n
\t