使用 cat 在非交互式 bash 脚本中重定向到文件时标记文件结尾
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原文地址: http://stackoverflow.com/questions/12466786/
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marking end of file while redirecting to a file in a non-interactive bash script using cat
提问by none
I'm trying to redirect a multi-line string to a file. The string contains special chars like quotaand looks like this:
我正在尝试将多行字符串重定向到文件。该字符串包含诸如配额之类的特殊字符，如下所示：
import "this"
import "that"
main() {
println("some text here");
}
I can use echosuch as:
我可以使用echo例如：
echo "import \"this\"
import \"that\"
main() {
println(\"some text here\");
}" > myfile.txt
The problem with this approach is that I need to escape all quotachars. I thought about using catto eliminate the need for escaping. It works well in interactive shells so that I can type cat > myfile.txtand then write my string without escaping and then mark the end of file with <control>d.
这种方法的问题是我需要转义所有配额字符。我想过使用cat来消除逃避的需要。它在交互式 shell 中运行良好，因此我可以键入cat > myfile.txt然后写入我的字符串而无需转义，然后用<control>d.
How can I mark EOFin the script without the actual key sequence <control>d?
如何EOF在没有实际按键序列的情况下在脚本中进行标记<control>d？
回答by Jonathan Leffler
Use a 'here document':
使用“此处文档”：
cat <<'EOF' > myfile.txt
import "this"
import "that"
main() {
println("some text here");
}
EOF
The quotes around the initial 'EOF' mean "do not expand any shell variables (etc) in the here document".
初始'EOF'周围的引号表示“不要在此处的文档中扩展任何shell变量（等）”。
