bash 评估来自标准输出的行
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evaluating lines from stdout
提问by j.lee
I have a bash script that is executing a program in a loop. I want to evaluate each line from the stdout and do something if it matches my condition.
我有一个 bash 脚本，它在循环中执行程序。我想评估标准输出中的每一行，如果它符合我的条件就做一些事情。
I still want to be able to see stdout on the screen. Is there a simple way to accomplish this? Thanks!
我仍然希望能够在屏幕上看到标准输出。有没有简单的方法来实现这一点？谢谢！
回答by Oliver Charlesworth
There are several variants of looping over input, but one possibility is thus:
循环输入有多种变体，但一种可能性是：
my_cmd | while read line; do
echo "$line"
my_process "$line"
done
回答by Bacon
This should do what you want:
这应该做你想做的：
for string in "a" "b" "c"
do
output=`echo ${string}`
echo ${output}
if [ ${output} == "b" ] ; then
echo "do something"
fi
done
Just replace the first echo with your program.
只需用您的程序替换第一个 echo 即可。
