将换行符附加到 shell 脚本中的输出文件 [英] Appending a line break to an output file in a shell script

问题描述

我有一个在 Cygwin 中执行的 shell 脚本(也许这就是问题所在).对于这段代码，我只想写第一行，并附加一个换行符:

I have a shell script that I am executing in Cygwin (maybe this is the problem). For this bit of code, I simply want to write the first line, and append a line break:

echo "`date` User `whoami` started the script." >> output.log
echo >> output.log

但是 output.log 文件似乎从来没有休息过.如果我多次运行脚本，就好像第二次回显没有写入文件.

But the output.log file never seems to take the break. If I run the script multiple times, it's as if the second echo doesn't write to the file.

我也试过:

echo -e "`date` User `whoami` started the script.\n" >> output.log

它产生相同的结果.

奇怪的是，如果我只是在命令行上输入上面的第二个 echo 语句，而不附加到文件中，它会为我提供带有尾随换行符的预期输出.

The odd thing is if I just enter the second echo statement above on the command line, without appending to the file, it gives me the expected output with the trailing line break.

推荐答案

我敢打赌问题是 Cygwin 正在将 Unix 行尾 (LF) 写入文件，而您正在使用需要 Windows 的程序打开它行尾 (CRLF).确定是否是这种情况—以及一些骇人听闻的解决方法—试试:

I'm betting the problem is that Cygwin is writing Unix line endings (LF) to the file, and you're opening it with a program that expects Windows line-endings (CRLF). To determine if this is the case — and for a bit of a hackish workaround — try:

echo "`date` User `whoami` started the script."$'\r' >> output.log

(其中末尾的 $'\r' 是一个额外的回车；它加上 Unix 行结束，将导致 Windows 行结束).

(where the $'\r' at the end is an extra carriage-return; it, plus the Unix line ending, will result in a Windows line ending).

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