回声但保留双引号 [英] Echo but retain double quotes

问题描述

我正在尝试创建一个将变量/文本回显到文件的脚本-该脚本的片段为：

  echo 
 SUBJECT =在此处输入文字 
 EMAIL = [e-mail] 
 EMAILMESSAGE = / tmp / emailmessage.txt 
> /root/email.txt 
  

这很好，但是所有双引号都被删除了。 / p>

当前输出：

 ＃cat /root/email.txt 
 SUBJECT =在此处输入文本
 EMAIL=[e-mail] 
 EMAILMESSAGE = / tmp / emailmessage.txt 
  

所需的输出：

 ＃cat /root/email.txt 
 SUBJECT =在此输入文字 
 EMAIL = [e-mail] 
 EMAILMESSAGE = / tmp / emailmessage.txt 
  

有什么想法吗？

欢呼声

解决方案

双引号不嵌套。使用单引号：

  echo'
 SUBJECT =在此处输入文字 
 EMAIL = email @ domain .co.uk 
 EMAILMESSAGE = / tmp / emailmessage.txt 
'> /root/email.txt 
  

但这会在文件的顶部和底部添加空行。如果您不想这样：

  echo'SUBJECT =在此处输入文字 
 EMAIL = email @ domain .co.uk 
 EMAILMESSAGE = / tmp / emailmessage.txt'> /root/email.txt 
  

可能更干净的解决方案是使用此处文档

 猫> email.txt<<'EOF'
 SUBJECT =在此输入文字 
 EMAIL = [e-mail] 
 EMAILMESSAGE = / tmp / emailmessage.txt 
 EOF 
  

I'm trying to create a script which will echo varibles / text to a file - a snippet of this script is:

echo "
SUBJECT="Text here"
EMAIL="[e-mail]"
EMAILMESSAGE="/tmp/emailmessage.txt"
" > /root/email.txt

This is working fine but all of the double quotes are being removed.

Current output:

# cat /root/email.txt
SUBJECT=Text here
EMAIL=[e-mail]
EMAILMESSAGE=/tmp/emailmessage.txt

Desired output:

# cat /root/email.txt
SUBJECT="Text here"
EMAIL="[e-mail]"
EMAILMESSAGE="/tmp/emailmessage.txt"

Any ideas?

Cheers

解决方案

Double quotes don't nest. Use single quotes:

echo '
SUBJECT="Text here"
EMAIL="[e-mail]"
EMAILMESSAGE="/tmp/emailmessage.txt"
' > /root/email.txt

But this will add empty lines to the top and bottom of the file. If you don't want those:

echo 'SUBJECT="Text here"
EMAIL="[e-mail]"
EMAILMESSAGE="/tmp/emailmessage.txt"' > /root/email.txt

Probably a cleaner solution is to use a "here document"

cat > email.txt <<'EOF'
SUBJECT="Text here"
EMAIL="[e-mail]"
EMAILMESSAGE="/tmp/emailmessage.txt"
EOF

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