vim fastping.sh
#!/bin/bash
# default settings
subnet=$1 # C type subnet
retry=2 # retry times
timeout=3 # timeout seconds
output=/tmp/ping.output # output file
# function print_help
function print_help(){
echo "Examples:"
echo ${0} 172.17.32
echo ${0} 192.168.1 unable
exit 1
}
# check the parameter
if [ $# -lt 1 ]; then
print_help
fi
# check the network parameter's format
count=0
for i in $(echo $1 |sed 's/＼./ /g')
do
count=$((${count}+1))
done
if [ ${count} -ne 3 ]; then
print_help
fi
# clean the output file
> ${output}
function pingable(){
ping -c ${retry} -w ${timeout} -q ${subnet}.${i} &> /dev/null && echo ${i} >> ${output}
}
function unpingable(){
ping -c ${retry} -w ${timeout} -q ${subnet}.${i} &> /dev/null || echo ${i} >> ${output}
}
# get the check type
if [ "$2" == "unable" ]; then
status="unpingable"
else
status="pingable"
fi
# ping as paraller mode and write output into file
for i in {1..255}
do
${status} &
done
# wait for all ping processes done
wait
# print output with better order
sum=$(wc -l ${output} |awk '{print $1}')
echo "There are ＼"${sum}＼" ＼"${status}＼" IPs begin with ＼"${subnet}.＼" :"
cat ${output} | sort -t"." -k1,1n -k2,2n -k3,3n -k4,4n | xargs -n 20 echo " "
chmod +x fastping.sh
./fastping.sh
Examples:
./fastping 172.17.32
./fastping 192.168.1 unable
time ./fastping.sh 192.168.1
There are "142" "pingable" IPs begin with "192.168.1" :
1 10 12 13 14 15 16 18 19 20 21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 40 41 42 43 44 45 46 47 48 49 50 51
52 53 54 55 56 57 59 60 61 62 63 64 65 66 67 68 69 70 71 72
73 74 75 76 77 78 80 81 83 84 85 86 87 88 89 90 91 92 93 94
95 96 97 98 99 100 101 102 103 104 105 106 107 108 112 113 114 115 116 117
118 119 120 121 122 123 124 125 126 127 128 133 134 135 136 137 138 139 140 141
142 143 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
170 254
real 0m3.201s
user 0m0.135s
sys 0m0.495s
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