Linux Bash - 因为我是猫？
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Bash - for i in cat?
提问by Alasdair
I'm not a bash scriptor, so this is no doubt a very simple question.
我不是 bash 脚本编写者，所以这无疑是一个非常简单的问题。
I have a bash script throwing an error. It looks like this:
我有一个 bash 脚本抛出错误。它看起来像这样：
#!/bin/bash
for i in (cat /root/list.txt)
do
doSomething
done
The error is on the second line, related to the curly brackets. So it seems curly brackets shouldn't be here... in which case, what should line 2 look like?
错误在第二行，与大括号有关。所以看起来大括号不应该在这里......在这种情况下，第2行应该是什么样子？
The script is supposed to read each line out of /root/list.txt and then doSomething with this (I removed the actual command for this example.)
该脚本应该从 /root/list.txt 中读取每一行，然后用它做一些事情（我删除了这个例子的实际命令。）
Thanks!
谢谢！
采纳答案by geekosaur
Probably
大概
for i in $(cat /root/list.txt)
回答by Ignacio Vazquez-Abrams
You should not use a for loop to read lines. Use a while read loop instead.
您不应该使用 for 循环来读取行。改用 while 读取循环。
#!/bin/bash
while read -r i; do
doSomething
done < /root/list.txt
回答by mah454
You can debug your bash script with :
您可以使用以下命令调试 bash 脚本：
set -x
Use this :
用这个 ：
for line in $(cat /etc/fstab)
do
echo $line ; sleep 1
done
Or this :
或这个 ：
while read line
do
echo $line ; sleep 1
done < /etc/fstab
Note : line is variable
注意：线是可变的
回答by weima
try
尝试
#!/bin/bash
for i in `cat /root/list.txt`
do
doSomething
done
