shellscripting

vi vikas.sh
i




#! bin/bash
pwd
ls -l
df -h
free
touch mayuresh

ecs : wq enter 

chmod +x vikas.sh

./vikas.sh




set of linux command .sh and run 



1


#!/bin/bash  
echo "This is my shell script with batch-43"  
ls
echo "I am done running ls command"  
SOMEVAR='Neetesh is expaining first the script'  
echo "$SOMEVAR"

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xample 2
#!/bin/bash 
echo "Hello there"
echo "My name is $(whoami)"
echo "Nice to meet you"


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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"  
SOMEVAR='text stuff'  
echo "$SOMEVAR"

Expected Output 


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#!/bin/bash

# Define bold color codes for a modern look
BLUE='\033[1;34m'
GREEN='\033[1;32m'
CYAN='\033[1;36m'
YELLOW='\033[1;33m'
RESET='\033[0m'

# Clear the screen for a clean presentation
clear

# Main Header
echo -e "${BLUE}=======================================${RESET}"
echo -e "${BLUE}         MY MONITORING SCRIPT          ${RESET}"
echo -e "${BLUE}=======================================${RESET}"
echo -e "${CYAN}Note: This is my 3rd script on machine.${RESET}\n"

# Section 1: System Identification
echo -e "${GREEN}[+] Host Identification${RESET}"
echo -e "${GREEN}---------------------------------------${RESET}"
echo -n "Hostname:   " && hostname
echo -n "IP Address: " && hostname -i
echo ""

# Section 2: Storage and Memory
echo -e "${YELLOW}[+] Resource Capacity${RESET}"
echo -e "${YELLOW}---------------------------------------${RESET}"
echo -e "--- Memory Overview ---"
free -h
echo ""
echo -e "--- Disk Overview ---"
df -h
echo ""

# Section 3: Active Processes
echo -e "${CYAN}[+] Running Processes (Top 10 CPU Users)${RESET}"
echo -e "${CYAN}---------------------------------------${RESET}"
ps aux --sort=-%cpu | head -n 11
echo ""

echo -e "${BLUE}=======================================${RESET}"

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#!/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 30
        # clean
done


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#!/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"