如何忽略bash腳本中的轉義字符？

Question

我正在制作bash腳本，我需要一個SQL查詢，但是它具有bash的轉義字符。

我想讀取不帶bash轉義字符的SQL查詢，為什么這個轉義字符是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';"

謝謝！

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"

輸出

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

編輯 ，如果需要擴展變量，請從EOF刪除' ，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變量）打印

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