bashスクリプトを使用して先着順を作成する[閉じる]

#/bin/bash
sort(){
    for ((i = 0; i<$n; i++)) 
    do
          
        for((j = 0; j<`expr $n - $i - 1`; j++)) 
        do
          
        if [ ${arrival_time[j]} -gt ${arrival_time[$((j+1))]} ] 
        then
            # swap 
            temp=${arrival_time[j]} 
            arrival_time[$j]=${arrival_time[$((j+1))]}   
            arrival_time[$((j+1))]=$temp 
            temp=${burst_time[j]} 
            burst_time[$j]=${burst_time[$((j+1))]}   
            burst_time[$((j+1))]=$temp
            temp=${pid[j]} 
            pid[$j]=${pid[$((j+1))]}   
            pid[$((j+1))]=$temp
        elif [ ${arrival_time[j]} -eq ${arrival_time[$((j+1))]} ]
        then
            if [ ${pid[j]} -eq ${pid[$((j+1))]} ]
            then
                temp=${arrival_time[j]} 
                arrival_time[$j]=${arrival_time[$((j+1))]}   
                arrival_time[$((j+1))]=$temp 
                temp=${burst_time[j]} 
                burst_time[$j]=${burst_time[$((j+1))]}   
                burst_time[$((j+1))]=$temp
                temp=${pid[j]} 
                pid[$j]=${pid[$((j+1))]}   
                pid[$((j+1))]=$temp
            fi
        fi
        done
    done
}

border(){
    z=121
    for ((i=0; i<$z; i++))
    do
    echo -n "-"
    done
    echo ""
}

findWaitingTime(){
    service_time[0]=0
    waiting_time[0]=0
    for ((i=1; i<$n; i++))
    do
        z=1
        y=`expr $i - $z`
        service_time[$i]=`expr ${service_time[$y]} + ${burst_time[$y]} `
        waiting_time[$i]=`expr ${service_time[$i]} - ${arrival_time[$i]}`
        if [ ${waiting_time[$i]} -lt 0 ]
        then
            waiting_time[$i]=0
        fi
    done
}

findTurnAroundTime(){
    for ((i=0; i<$n; i++))
    do
        tat[$i]=`expr ${waiting_time[$i]} + ${burst_time[$i]}`
    done
}

findAverageTime(){
    sort
    findWaitingTime
    findTurnAroundTime
    total_wt=0
    total_tat=0
    border
    printf "|%-18s|%-20s|%-18s|%-20s|%-18s|%-20s|\n" "Process Id" "Burst time" "Arrival time" "Waiting time" "Turn around time" "Completion time"
    border
    for ((i=0; i<$n; i++))
    do
        total_wt=`expr $total_wt + ${waiting_time[$i]}`
        total_tat=`expr ${tat[$i]} + $total_tat`
        completion_time=`expr ${arrival_time[$i]} + ${tat[$i]}`
        printf "|%-18s|%-20s|%-18s|%-20s|%-18s|%-20s|\n" ${pid[$i]} ${burst_time[$i]} ${arrival_time[$i]} ${waiting_time[$i]} ${tat[$i]} $completion_time
        #echo "${burst_time[$i]}     ${arrival_time[$i]}     ${waiting_time[$i]}       ${tat[$i]}         $completion_time"
    done
    border
    #avgwt=`echo "scale=3; $total_wt / $n" | bc`
    echo -n "Average waiting time ="
    printf %.3f\\n "$(($total_wt / $n))"
    #avgtat=`echo "scale=3; $total_tat / $n" | bc`
    echo -n "Average turn around time ="
    printf %.3f\\n "$(($total_tat / $n))"
    
    for ((i=0; i<8*n+n+1; i++))
    do
        echo -n "-"
        done
        echo ""

    for ((i=0; i<$n; i++))
    do
        echo -n "|   "
        echo -n "P${pid[$i]}"
        echo -n "   "
    done
    echo "|"
    for ((i=0; i<8*n+n+1; i++))
    do
        echo -n "-"
        done
        echo ""
    echo -n "0  "
    for ((i=0; i<$n; i++))
    do
        echo -n "`expr ${arrival_time[$i]} + ${tat[$i]}`"
        echo -n "      "
    done
    echo ""
}


n=$(sed -e '1~2d' fcfs1.txt |awk '{ for (i=1; i<=NF; i++) RtoC[i]= (i in RtoC?RtoC[i] OFS :"") $i; } END{ for (i=1; i<=NF; i++) print RtoC[i] }'| awk '{print $1}' |wc -l)
for ((i=0; i<$n; i++))
do
pid[$i]=$(cat fcfs.txt | awk '{print $1}')
arrival_time[$i]=$(cat fcfs.txt | awk '{print $2}')
burst_time[$i]=$(cat fcfs.txt | awk '{print $3}')
done
findAverageTime

fcfs.txtの内容は次のとおりです。

1  15  10
2   17  12

入力ファイルにプロセスが1つしかない場合、スクリプトは正常に機能し、複数のプロセスがあるときに入力ファイルにプロセスが1つしかない場合、スクリプトはエラー出力を提供します。

-------------------------------------------------------------------------------------------------------------------------
|Process Id        |Burst time          |Arrival time      |Waiting time        |Turn around time  |Completion time     |
-------------------------------------------------------------------------------------------------------------------------
|1                 |5                   |10                |0                   |5                 |15                  |
-------------------------------------------------------------------------------------------------------------------------
Average waiting time =0.000
Average turn around time =5.000
----------
|   P1   |
----------
0   15