bash Shell 脚本：如何在 Windows 上读取不以换行符结尾的文本文件
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原文地址: http://stackoverflow.com/questions/9408103/
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Shell Script: how to read a text file that does not end with a newline on Windows
提问by user1010399
The following program reads a file and it intends to store the all values (each line) into a variable but doesn't store the last line. Why?
下面的程序读取一个文件，它打算将所有值（每一行）存储到一个变量中，但不存储最后一行。为什么？
file.txt:
文件.txt:
1
2
.
.
.
n
Code:
代码：
FileName=file.txt
if test -f $FileName # Check if the file exists
then
while read -r line
do
fileNamesListStr="$fileNamesListStr $line"
done < $FileName
fi
echo "$fileNamesListStr" // 1 2 3 ..... n-1 (but it should print up to n.)
回答by glenn Hymanman
Instead of reading line-by-line, why not read the whole file at once?
与其逐行读取，为什么不一次读取整个文件呢？
[ -f $FileName ] && fileNameListStr=$( tr '\n' ' ' < $FileName )
回答by Ade YU
One probable cause is that there misses a newline after the last line n.
一个可能的原因是在最后一行之后缺少换行符n。
Use the following command to check it:
使用以下命令进行检查：
tail -1 file.txt
And the following fixes:
以及以下修复：
echo >> file.txt
If you really need to keep the last line withoutnewline, I reorganized the whileloop here.
如果你真的需要保留没有换行符的最后一行，我在while这里重新组织了循环。
#!/bin/bash
FileName=0
if test -f $FileName ; then
while [ 1 ] ; do
read -r line
if [ -z $line ] ; then
break
fi
fileNamesListStr="$fileNamesListStr $line"
done < $FileName
fi
echo "$fileNamesListStr"
回答by jordanm
The issue is that when the file does not end in a newline, read returns non-zero and the loop does not proceed. The read command will still read the data, but it will not process the loop. This means that you need to do further processing outside of the loop. You also probably want an array instead of a space separated string.
问题是当文件不以换行符结尾时， read 返回非零并且循环不会继续。读取命令仍会读取数据，但不会处理循环。这意味着您需要在循环之外做进一步的处理。您可能还需要一个数组而不是空格分隔的字符串。
FileName=file.txt
文件名=文件.txt
if test -f $FileName # Check if the file exists
then
while read -r line
do
fileNamesListArr+=("$line")
done < $FileName
[[ -n $line ]] && fileNamesListArr+=("$line")
fi
echo "${fileNameListArr[@]}"
See the "My text files are broken! They lack their final newlines!" section of this article: http://mywiki.wooledge.org/BashFAQ/001
请参阅“我的文本文件已损坏！他们缺少最后的换行符！” 本文部分：http: //mywiki.wooledge.org/BashFAQ/001
回答by ArunGJ
As a workaround, before reading from the text file a newline can be appended to the file.
作为一种解决方法，在从文本文件读取之前，可以将换行符附加到文件中。
echo "\n" >> $file_path
This will ensure that all the lines that was previously in the file will be read. Now the file can be read line by line.
这将确保之前在文件中的所有行都将被读取。现在可以逐行读取文件。
