Bash-如何在sed命令输出中保留换行符？

假设我有一个文件BookDB.txt，它以以下格式存储数据：

Harry Potter - The Half Blood Prince:J.K Rowling:40.30:10:50
The little Red Riding Hood:Dan Lin:40.80:20:10
Harry Potter - The Phoniex:J.K Rowling:50.00:30:20
Harry Potter - The Deathly Hollow:Dan Lin:55.00:33:790
Little Prince:The Prince:15.00:188:9
Lord of The Ring:Johnny Dept:56.80:100:38
Three Little Pig:Andrew Lim:89.10:290:189
All About Linux:Ubuntu Team:76.00:44:144
Catch Me If You Can:Mary Ann:23.60:6:2
Python for dummies:Jared Loo:15.99:1:10

我正在尝试将输出中的（：）分隔符替换为（，）。它成功了，但从输出中删除了换行符。这是我的密码：

TITLE=Potter
OUTPUT=$(cat BookDB.txt | grep $TITLE)
OUTPUT1=$(sed 's/:/, /g' <<< $OUTPUT)
echo $OUTPUT1

但是，它看起来是这样的：

Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, 50
Harry Potter - The Phoniex, J.K Rowling. 50.00. 30. 20
Harry Potter - The Deathly Hollow, Dan Lin, 55.00, 33, 790

 Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, 50 Harry Potter - The Phoniex, J.K Rowling, 50.00, 30, 20 Harry Potter - The Deathly Holl
ow, Dan Lin, 55.00, 33, 790

---

如果有人能分享如何在输出中保留换行符，我将非常感激

您可以避免

cat

并在sed中执行所有操作：

sed -n '/Potter/s/:/, /gp' file
Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, 50
Harry Potter - The Phoniex, J.K Rowling, 50.00, 30, 20
Harry Potter - The Deathly Hollow, Dan Lin, 55.00, 33, 790

---

只需使用正确的报价：

TITLE=Potter
OUTPUT=$(cat BookDB.txt | grep $TITLE)
OUTPUT1=$(sed 's/:/, /g' <<< "$OUTPUT")
echo "$OUTPUT1"

TITLE=Potter
输出=$（cat BookDB.txt | grep$标题）
OUTPUT1=$（sed's/：/，/g'使用
awk
。匹配将特定于标题，不包括作者姓名

awk -F: -v OFS=', ' '$1 ~ /Potter/ { $1 = $1; print }' file

输出：

Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, 50
Harry Potter - The Phoniex, J.K Rowling, 50.00, 30, 20
Harry Potter - The Deathly Hollow, Dan Lin, 55.00, 33, 790

Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, 50
Harry Potter - The Phoniex, J.K Rowling, 50.00, 30, 20

这不会产生任何输出：

awk -F: -v OFS=', ' '$1 ~ /Rowling/ { $1 = $1; print }' file

但这将：

awk -F: -v OFS=', ' '$2 ~ /Rowling/ { $1 = $1; print }' file

输出：

Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, 50
Harry Potter - The Phoniex, J.K Rowling, 50.00, 30, 20
Harry Potter - The Deathly Hollow, Dan Lin, 55.00, 33, 790

Harry Potter - The Half Blood Prince, J.K Rowling, 40.30, 10, 50
Harry Potter - The Phoniex, J.K Rowling, 50.00, 30, 20

要与标题和作者匹配，您可以：

awk -F: -v OFS=', ' '$1 ~ /Potter/ && $2 ~ /Rowling/ { $1 = $1; print }' file

或匹配（如果有验证）：

awk -F: -v OFS=', ' '$1 ~ /Potter/, $2 ~ /Rowling/ { $1 = $1; print }' file

+1但当然，你可以将其实质性地重构为
sed-n/$TITLE/s/：/，/gp“BookDB.txt
@tripleee确实如此。正如anubhava已经指出的那样，我只是强调了引用问题（这可能会在OP的代码中引起更多问题）