Como passar variáveis para um HEREDOC no bash?

Question

Eu quero fazer algo assim:

$ NAME=John
$ cat << '==end' > test
My name is $NAME
==end

$ cat test
My name is John

Alguma idéia?

    

Answer 1

cat <<EOF > test
My name is $NAME
EOF

ou até mesmo

cat <<==end > test
My name is $NAME
==end

Trabalhei para mim.

Parece que quando você pega ==end na variável ' não substitui.

ah, aqui está na página do manual (veja 3.6.6) :

The format of here-documents is:

      <<[-]word
              here-document
      delimiter

No parameter expansion, command substitution, arithmetic expansion, or pathname expansion is performed on word. 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. If word is unquoted, all lines of the here-document are subjected to parameter expansion, command substitution, and arithmetic expansion. [...]