File 1 : sampleInputFile
Name, Xloc, YLoc, Zloc
John, 10.5, 80.1, 5.80
Mary, 30.4, 20.5, 9.20
Paul, 10, 1000.0, 10.6
File 2 : proj01.sh (bash script file)
File 3 : correspondingOutputFile (output would shown in this file)
If input cmd : proj01.sh sampleInputFile 1 (In 3rd param, 1 is john, 2 is Mary, 3 is Paul)
Format of the output : Mary 62.9 (as Mary is near to John, and we can round that to 63.0 also)
**challenge** :
1) Check if filename passed in 1st parameter exists, if not stop with some message.
2) check that the index passed in 2nd parameter is an integer and is valid, which means is it less or equally to the number of entries and > 0.
3) bash script (proj01.sh) is going to find the min dist from the index person to another person.
calculate distances using : d = sqrt ( (x1-x2)^2 + (y1-y2)^2 + (z1-z2)^2 )注意：所有文件都在同一目录中。
尝试读取值，但不确定如何通过给定的索引行比较所有行：
{
read
while IFS=, read -r n x y z
do
echo "n: $n x: $x y: $y z: $z"
done
} < $inputFile我非常感谢你的帮助。
这里我使用awk来执行计算，最后我对结果进行四舍五入，正如您所说。变量的前缀是字母"l"，意思是"局部作用域"。
函数接收数据文件和原始记录，使用与我们在数据文件中找到的格式相同的格式(Name，x_loc，y_loc，z_loc(。
您需要创建更多的代码来进行验证。我没有提供完整的代码，因为我知道你正在练习这个挑战。
此功能跳过与原点提供的相同记录，这样使用起来更方便：
######################################################################
# Finds the person with the shortest distance from a specified origin
# Arguments:
# l_data_file - Data file to get the information
# l_origin - Origin record. (Format: Mary, 30.4, 20.5, 9.20)
######################################################################
function finds_the_person_with_shortest_distance() {
local l_data_file="$1"
local l_origin_data="$2"
local l_origin_name
local l_origin_x_loc
local l_origin_y_loc
local l_origin_z_loc
local l_name
local l_x_loc
local l_y_loc
local l_z_loc
local l_current_distance
local l_min_distance
local l_min_distance_person_name
read l_origin_name l_origin_x_loc l_origin_y_loc l_origin_z_loc < <(echo "${l_origin_data}" | tr -d ',')
local l_flag_first_record=true
while read l_name l_x_loc l_y_loc l_z_loc ; do
# Skips the first record
if [[ "${l_flag_first_record}" == "true" ]]; then
l_flag_first_record=false
continue
fi
# Skips the person at the same location as the origin
if [[ "${l_origin_name}" == "${l_name}" ]] &&
[[ "${l_origin_x_loc}" == "${l_x_loc}" ]] &&
[[ "${l_origin_y_loc}" == "${l_y_loc}" ]] &&
[[ "${l_origin_z_loc}" == "${l_z_loc}" ]]; then
continue
fi
##### calculates the distance #####
l_current_distance=$(
echo "${l_origin_x_loc} ${l_origin_y_loc} ${l_origin_z_loc} ${l_x_loc} ${l_y_loc} ${l_z_loc}" |
awk '{ print int( sqrt( ($1-$4)^2 + ($2-$5)^2 + ($3-$6)^2 ) ) }'
)
if [[ -z "${l_min_distance}" ]] ||
[[ ${l_current_distance} -lt ${l_min_distance} ]]; then
l_min_distance=${l_current_distance}
l_min_distance_person_name="${l_name}"
fi
done < <(cat "${l_data_file}" | tr -d ',')
echo "${l_min_distance_person_name} ${l_min_distance}"
}