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Xeoncross
Asked: 2012-06-17 07:31:20 +0800 CST

How do you escape characters in heredoc?

  • 772

I'm working with a bash script trying to stop it from attempting to replace variables inside my heredoc. How do set a heredoc to either A) escape the variable names instead of parsing them or B) return the entire string untouched?

cat > /etc/nginx/sites-available/default_php <<END
server {
    listen 80 default;
    server_name _;
    root /var/www/$host; <--- $host is a problem child
}
END

As is, when I it finishes injecting it into a file I'm left with this:

server {
    listen 80 default;
    server_name _;
    root /var/www/;
}
linux bash heredoc

2 Answers

  1. Best Answer

    From the bash(1) man page:

    If any characters in word are quoted, the delimiter is the result of quote removal on word, and the lines in the here-document are not expanded.

    cat > /etc/nginx/sites-available/default_php <<"END"
    • 40

  2. Just with a backslash:

    cat > /tmp/boeboe <<END
server {
    listen 80 default;
    server_name _;
    root /var/www/\$host';
}
END
    • 36