1)

whoami

2)

touch greatl.txt grfatl.txt greftl.txt grertl.txt grratl.txt grertl.txt grretl.txt
ls g???tly.txt

3)

sed -n 2,6p status.report

4)
chmd +wr
chmod 666 year2020

5)

grep best status.report
grep best status.report | cat >  extracted.txt

6)

ls section*
ls section1 section2 section3

7)
cat part1 part2 > book

8)

! /usr/bin/bash

first program

echo "Script started..."
read -p "Enter the file name: " file

totalLine=$(wc -l < $file)
totalWord=$(wc -w < $file)
totalBite=$(wc -c < $file)
((totalLine+=1))

echo "Total number of lien(s) in $file is: $totalLine";

echo "Total number of words(s) in $file is: $totalWord";

echo "Total number of bites(s) in $file is: $totalBite";


 9)

Sjf

!/bin/bash


    clear ;
    n=0;

    read -p "Echo number of process: " n;

    declare -a bt[n];
    declare -a p[n];
    declare -a wt[n];
    declare -a tat[n];

    bt[0]=0
    # get burst time
    echo "Enter Burst time: ";
    for((i=0; i<n; i++)); do
        ((N=i+1))
        read -p "process $N: "  bt[i];
        (( p[$i]=i+1 ))
    done

    btn=( $( printf "%s\n" "${bt[@]}" | sort -n ) )
    (( wt[0]=0 ))

    for (( i = 1; i < n; i++ )); do
        (( wt[i]=0 ))
        for(( j = 0; j < i; j++ )); do
             (( wt[i]+=btn[j] ))
        done
        (( total+=wt[i] ))
    done

    (( avg_wt=total/n ))
    (( avg_wt+=total%n ))
    (( total = 0))

    echo "Process    Burst Time    Waiting Time Turnaround Time";
    for(( i = 0; i < n; i++ ))
    {
        (( tat[i]=btn[i]+wt[i] ))
        (( total+=tat[i] ))
        echo "${p[i]}            ${btn[i]}               ${wt[i]}                ${tat[i]}"

    }

    (( avg_tat=total/n ))
    (( avg_tat+=total%n ))

    echo "Average Waiting Time= " $avg_wt;
    echo "Average Turnaround Time= " $avg_tat;

echo ;
echo ;

read -p "Enter Burst time: " burst;