如何对文本文件中的一行数字求和——Bash Shell Scripting
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How to sum a row of numbers from text file-- Bash Shell Scripting
提问by clb
I'm trying to write a bash script that calculates the average of numbers by rows and columns. An example of a text file that I'm reading in is:
我正在尝试编写一个 bash 脚本，用于按行和列计算数字的平均值。我正在阅读的文本文件的一个例子是：
1 2 3 4 5
4 6 7 8 0
There is an unknown number of rows and unknown number of columns. Currently, I'm just trying to sum each row with a while loop. The desired output is:
行数未知，列数未知。目前，我只是想用一个 while 循环对每一行求和。所需的输出是：
1 2 3 4 5 Sum = 15
4 6 7 8 0 Sum = 25
And so on and so forth with each row. Currently this is the code I have:
每行依此类推。目前这是我的代码：
while read i
do
echo "num: $i"
(( sum=$sum+$i ))
echo "sum: $sum"
done <
To call the program it's stats -r test_file. "-r" indicates rows--I haven't started columns quite yet. My current code actually just takes the first number of each column and adds them together and then the rest of the numbers error out as a syntax error. It says the error comes from like 16, which is the (( sum=$sum+$i )) line but I honestly can't figure out what the problem is. I should tell you I'm extremely new to bash scripting and I have googled and searched high and low for the answer for this and can't find it. Any help is greatly appreciated.
要调用程序，它是 stats -r test_file。“-r”表示行——我还没有开始列。我当前的代码实际上只是取每列的第一个数字并将它们加在一起，然后其余的数字作为语法错误出现。它说错误来自像 16，它是 (( sum=$sum+$i )) 行，但老实说，我无法弄清楚问题是什么。我应该告诉你，我对 bash 脚本非常陌生，我在谷歌上搜索并搜索了很多关于这个问题的答案，但找不到。任何帮助是极大的赞赏。
采纳答案by Kadir
You are reading the file line by line, and summing line is not an arithmetic operation. Try this:
您正在逐行读取文件，并且求和行不是算术运算。尝试这个：
while read i
do
sum=0
for num in $i
do
sum=$(($sum + $num))
done
echo "$i Sum: $sum"
done <
just split each number from every line using for loop. I hope this helps.
只需使用 for 循环从每一行拆分每个数字。我希望这有帮助。
回答by bufh
Another non bash way (con: OP asked for bash, pro: does not depend on bashisms, works with floats).
另一种非 bash 方式（con：OP 要求 bash，pro：不依赖于 bashisms，使用浮动）。
awk '{c=0;for(i=1;i<=NF;++i){c+=$i};print while read line
do
sum=$(sed 's/[ ]\+/+/g' <<< "$line" | bc -q)
echo "$line Sum = $sum"
done < filename
, "Sum:", c}'
回答by sat
Another way (not a pure bash):
另一种方式（不是纯的bash）：
