发现社区一个脚本执行后，cat命令写入后文件里面的表达式都求值展看了，其实这个是因为$的缘故，参看这个
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You can use regular quoting operators in a here document:
$ cat <<HERE
> foo(\$bar)
> HERE
foo($bar)
or you can disable expansion by quoting the here-doc delimiter:
$ cat <<'HERE' # note single quotes
> foo($bar)
> HERE
foo($bar)
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