在shell脚本中将换行符附加到输出文件 [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（也许是问题所在）。对于这段代码，我只想写第一行，并添加一个换行符：

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文件似乎从未中断过。如果我多次运行脚本，就好像第二次回声未写入文件。

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.

我也尝试过：

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

产生相同的结果。

奇怪的是，如果我仅在命令行中输入上面的第二个echo语句，而没有追加到文件中，它会带给我预期的输出，并带有换行符。

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，问题在于Cygwin正在将Unix行尾（LF）写入文件，而您正在使用需要Windows行尾的程序来打开它（CRLF）。要确定是否是这种情况–以及一些骇人的解决方法—尝试：

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 $'\r'最后是一个额外的回车符；它加上Unix行结尾将导致Windows行结尾。

(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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