我有一个bash脚本的时候这样调用它的工作原理： ./stats.sh -rows test_file
该方案基本上计算行平均值和中位数及平均数柱和中位数。 我们的节目，我想通过文件作为标准输入。 但是当我运行这段代码将打印"you have 2 provide 2 arguments" 。 我应该有什么样的变化，使以使代码采用标准输入作为一个文件。 我的意思是说如果我要运行脚本我可以通过这种方式运行，以及./stats.sh -rows < test_file 。 我想这个功能！
输入文件：（ 列由制表符分隔 ）
93 93 93 93 93 93 93 93 100
73 84 95 83 72 86 80 97 100
85 0 82 75 88 79 80 81 100
85 0 87 73 88 79 80 71 100
80 81 83 63 100 85 63 68 100
53 57 61 53 70 61 73 50 100
55 54 41 63 63 45 33 41 100
53 55 43 44 63 75 35 21 100
100 100 100 100 100 100 100 100 100
这是我对工作的代码是这样的：
#! /bin/bash
clear
#the arguments below will check for your command line args whether you have provided corrctly or not
flag=0
if [ "$#" -eq 0 ]; then
echo "Please provide arguments"
elif [ "$#" -lt 2 ]; then
echo "You have to provide 2 arguments" >&2
exit 1
elif [ "$#" -gt 2 ]; then
echo "${#}"
FILE= "${4}"
if [ -f "${FILE}" ]; then
flag=1
else
echo "You have provided more number of arguments" >&2
fi
exit 1
else
echo "You have entered correct number of arguments"
fi
# the below code is the case code which checks whether you have -r/-rows or -c/-cols
option="${1}"
l1=0
sorted=()
case ${option} in
-rows| -r| -r*)
if [ $flag -eq 1 ]; then
FILE="${4}"
else
FILE="${2}"
fi
clear
echo "Average Median"
lines=$(wc -l < "$FILE")
while read -r line
do
len=0
tot=0
name=$line
#array=(`echo $name | cut -d " " --output-delimiter=" " -f 1-`)
IFS=' ' read -a array <<< "$name" #if any error comes that might be with this line just check the spaces in the speech marks they should be 4 spaces as it is checking for tabs
for element in "${array[@]}"
do
tot=$(expr $tot + $element)
#let tot+=$element #you can use this as well to get the totals
let len+=1
done
avg=($(printf "%.0f" $(echo "scale=2;$tot/$len" | bc)))
readarray -t sorted < <(for a in "${array[@]}"; do echo "$a"; done | sort)
no=`expr $len % 2`
if [ $no -eq 0 ]; then
mid=`expr $len / 2`
echo "$avg ${sorted[$mid]}"
else
if [ $lines -lt 2 ]; then
mid=`expr $len / 2`
echo "$avg ${sorted[$mid]}"
else
l1=`expr $len / 2`
mid=`expr $l1 + 1`
echo "$avg ${sorted[$mid]}"
fi
fi
unset "array[@]"
unset "sorted[@]"
done < "$FILE"
;;
-cols| -c| -c*)
if [ $flag -eq 1 ]; then
FILE="${4}"
else
FILE="${2}"
fi
#echo "cols"
#echo "File name is $FILE"
cols=$(head -1 "$FILE" | tr "\t" '\n' | wc -l)
lines=$(wc -l < "$FILE")
IFS=$'\t\n' read -d '' -r -a lins < "$FILE"
while read line;do
x=1
read -a array <<< "$line" ##Split the line by spaces
for element in "${!array[@]}"
do
row[${element}]=$((${row[${element}]}+${array[$element]})) ##For each column increment array variable by number in the column.
((x++))
done
done < "$FILE"
echo "Averages: "
for element in ${row[@]}
do
mean= printf "%.0f" $(echo "scale=2;$element/$lines" | bc) ##bc prints floating point numbers and then we round of using scale and .0f
echo -n "$mean "
done
printf "\n"
echo "Medians: "
for ((i=0;i<$cols;i++))
do
carr=()
for ((j=i;j<$lines * $cols;j=j+$cols))
do
carr+=(${lins[$j]})
done
IFS=$' \n' csort=($(sort <<<"${carr[*]}"))
no=`expr $lines % 2`
if [ $no -eq 0 ]; then
mid=`expr $lines / 2`
echo -n "${csort[$mid]} "
else
if [ $lines -lt 2 ]; then
mid=`expr $lines / 2`
echo -n "${csort[$mid]} "
else
l1=`expr $lines / 2`
mid=`expr $l1 + 1`
echo -n "${csort[$mid]} "
fi
fi
done <<<"$lins"
printf "\n"
;;
*)
echo "`basename ${0}`:usage: [-r|-rows rows] | [-c|-cols columns]"
exit 1 # Command to come out of the program with status 1
;;
esac
trap "echo ;exit" 1 2
