コマンド文字列を生成して発行する

pfmtl02.sh

#!/bin/bash

# --+----1----+----2----+----3----+----4----+----5----+----6
# 変数初期化
# --+----1----+----2----+----3----+----4----+----5----+----6
#
    nHOSTS=100
    nTRIES=500                              # 試行回数
    WAIT=1                                  # インターバル

    echo "nHOSTS=$nHOSTS"
    echo "nTRIES=$nTRIES"
    echo "wait(s)=$WAIT"
    echo -n "GO -- Y/N.. "
    read YN

    [ $YN != "Y" ] && exit 1
    echo ":: start at `date` ::"
    for (( i=0; i < $nTRIES; i++ ))
    do
        RAND=$(( $RANDOM % nHOSTS ))
        HOST=`printf "test%03d.test" $RAND`
        printf "iteration %4d %s\n" $i $HOST
        nslookup $HOST 192.168.0.121
    done
    echo ":: finish at `date` ::"