bash 如何从bash脚本中的文件中逐行读取？
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how to read line by line from file in bash script?
提问by jonathan
I've searched online about this problem and I've found two ways so far:
我在网上搜索过这个问题，到目前为止我找到了两种方法：
while read line; do
commands
done < "$filename"
and
和
for $line in $(cat $filename); do
commands
done
none of these work if the lines have a space though, for example if we have a line like that
如果线条有空格，这些都不起作用，例如，如果我们有这样的线条
textextext text
it won't print textextext text
它不会打印 textextext text
but
但
textextext
text
it counts these things as a different line, how can I avoid this to happen?
它将这些事情视为不同的线路，我该如何避免这种情况发生？
回答by Michael Krelin - hacker
Like this?
像这样？
while IFS= read line ; do
something "$line"
done <"$file"
Here is a brief test:
这是一个简短的测试：
while IFS= read line ; do echo "$line"; done <<<"$(echo -e "a b\nc d")"
a b
c d
回答by sehe
You can you readarray (bash 4+)
你可以读数组（bash 4+）
readarray lines < "$file"
then
然后
for line in "${lines[@]}";
do
echo "$line"
done
Note that by default readarraywill even include the line-end character for each line
请注意，默认情况下readarray甚至会包括每一行的行尾字符
