bash 读取文本文件时删除 CR (\r)
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Remove CR (\r) while reading text file
提问by user1564015
I have this script where I'm reading a text file line by line and executing a command. I found that the strings (aka lines) always ends with '\r'.
我有这个脚本，我正在逐行读取文本文件并执行命令。我发现字符串（又名行）总是以'\r'.
I wanna remove the CR from the end of the string.
我想从字符串的末尾删除 CR。
This is how my code looks like:
这是我的代码的样子：
file="myfilelist.txt"
while IFS= read -r filename
do
git log --oneline -- ${filename} |wc -l
done <"$file"
I wanna be able to perform the command in the loop without \rat the end of every line string (aka filename).
我希望能够在循环中执行命令而无需\r在每行字符串（又名文件名）的末尾。
回答by Keith Thompson
Try this:
尝试这个：
git log --oneline -- $(echo "$filename" | tr -d '\r') | wc -l
Note that you don't need the curly braces when $filenameis surrounded by whitespace.
请注意，当$filename被空格包围时，您不需要花括号。
In principle you can also do this via bash's own parameter expansion mechanism:
原则上你也可以通过 bash 自己的参数扩展机制来做到这一点：
git log --oneline -- ${filename%^M} | wc -l
but the ^Mhas to be a literal control-M character, which is ugly and difficult to maintain.
但 the^M必须是字面的 control-M 字符，这很丑陋且难以维护。
Or you can delete all whitespace characters at the end of the name (which includes ^Mas well as space, tab, et al):
或者您可以删除名称末尾的所有空白字符（包括^M空格、制表符等）：
git log --oneline -- ${filename%[-[:space:]]} | wc -l
But now we're getting into techniques that very few people are likely to recognize without reading the manual.
