如何忽略bash脚本中的转义字符？

Question

我正在制作bash脚本，我需要一个SQL查询，但是它有bash的转义字符。

我想阅读没有bash转义字符的SQL查询，为什么这个转义字符是MySQL的。

QUERY="SELECT department_id, description FROM departments INTO OUTFILE '/var/lib/mysql-files/departaments.csv' FIELDS TERMINATED BY ', ' ENCLOSED BY '"' LINES TERMINATED BY '\n';"

谢谢!

Answer 1

您可以使用

read -r -d '' query <<'EOF'
SELECT department_id, description FROM departments INTO OUTFILE '/var/lib/mysql-files/departaments.csv' FIELDS TERMINATED BY ', ' ENCLOSED BY '"' LINES TERMINATED BY '\n';
EOF

printf "%s\n" "$query"

输出

SELECT department_id, description FROM departments INTO OUTFILE '/var/lib/mysql-files/departaments.csv' FIELDS TERMINATED BY ', ' ENCLOSED BY '"' LINES TERMINATED BY '\n';

编辑，在需要展开变量的情况下，从EOF中删除'，例如：

outfile=/tmp/file
read -r -d '' query <<EOF
SELECT department_id, description FROM departments
INTO OUTFILE '$outfile'
FIELDS TERMINATED BY ', ' ENCLOSED BY '"' LINES TERMINATED BY '\n';
EOF
printf "%s\n" "$query"

(注意$outfile变量)打印

SELECT department_id, description FROM departments
INTO OUTFILE '/tmp/file'
FIELDS TERMINATED BY ', ' ENCLOSED BY '"' LINES TERMINATED BY '\n';