在bash脚本中执行循环和变量吗？

Question

I'm a PHP programmer doing some BASH scripting and I'm not sure how global variables are working.

I want to increment the 3 variables for each line in a supplied file. However, when I get to the bottom, the variables are still set at 0. How do I access the variables that are incremented within the WHILE DO loop? I just want to echo them out at the end..

From what I understand we're in kornshell

#!/bin/bash

typeset -i i=0
typeset -i t1=0
typeset -i t2=0


sed 1d $1 |  \

while read word1 word2 word3 word4 word5 
do
        i=i+1
        t1=t1+$word4
        t2=t2+$word5
done

echo $i
echo $t1
echo $t2


exit 0

Answer 1

BASH FAQ条目＃24：“我在一个循环中设置变量。为什么它们在循环终止后突然消失？或者，为什么我不能管道数据来读取？”