需要测试看看国内机房和美国机房之间传输文件的速度，找到如下脚本

#!/bin/bash

# scp-speed-test.sh

#

# Usage:

#   ./scp-speed-test.sh user@hostname [test file size in MBs]

#

#############################################################

ssh_server=$1
test_file=".scp-test-file"
Optional: user specified test file size in MBs
if test -z “$2”
then
default size is 10MB
test_size=“10”
else
test_size=$2
fi
generate a file of all zeros
echo “Generating $test_size MB test file…”
dd if=/dev/zero of=$test_file bs=$(echo “$test_size10241024” | bc) \
count=1 &> /dev/null
upload test
echo “Testing upload to $ssh_server…”
up_speed=$(scp -v $test_file $ssh_server:$test_file 2>&1 | \
grep “Bytes per second” | \
sed “s/^[^0-9]\([0-9.]*\)[^0-9]\([0-9.]*\).*$/\1/g”)
up_speed=$(echo “($up_speed/1000000)” | bc)
download test
echo “Testing download from $ssh_server…”
down_speed=$(scp -v $ssh_server:$test_file $test_file 2>&1 | \
grep “Bytes per second” | \
sed “s/^[^0-9]\([0-9.]*\)[^0-9]\([0-9.]*\).*$/\2/g”)
down_speed=$(echo “($down_speed/1000000)” | bc)
clean up
echo “Removing test file on $ssh_server…”
ssh $ssh_server “rm $test_file”
echo “Removing test file locally…”
rm $test_file
print result
echo ""
echo “Upload speed:   $up_speed mbps”
echo “Download speed: $down_speed mbps”