我尝试在终端上运行以下命令：
bash -c 's="test"; s=$(echo "word1 word2 " | awk '{print $1;}'); echo $s;'
它给我以下错误：
bash: -c: line 0: unexpected EOF while looking for matching `)'
bash: -c: line 1: syntax error: unexpected end of file
}); echo $s;: command not found
将脚本保存到文件中时不会发生此问题。
通过-c传递给bash的参数使用单引号。这将“保护”内部的双引号，但不会保护在awk程序中用于隐藏“ $ 1”的引号。
来自bash Man
Enclosing characters in single quotes preserves the literal value of each character within the quotes. A single quote may not occur between single quotes,even when preceded by a backslash.
鉴于只需要引用一个字符，请考虑对awk程序使用双引号，并转义'$'
bash -c 's="test"; s=$(echo "word1 word2 " | awk "{print \$1;}"); echo $s;'
Output:
word1