bash - 无法使用cat和<< EOF通过SSH远程创建文件

Question

我正在尝试使用以下命令通过ssh远程创建文件:

ssh $REMOTE_USER@$REMOTE_HOST "
    cat > hooks/post-receive <<EOF
    #!/bin/bash
    git checkout -f
    EOF
    chmod +x hooks/post-receive
"

当我在远程服务器上使用cat repo.git/hooks/post-receive检查文件成功执行之后，我看到以下结果:

#!/bin/bash
git checkout -f
EOF
chmod +x hooks/post-receive

我希望EOF文件中不存在chmod +x hooks/post-receive和post-receive。
如何解决这个问题。

Answer 1

从man bash:

Here Documents

This type of redirection instructs the shell to read input from the current source until a line containing only delimiter (with no trailing blanks) is seen.

...

If the redirection operator is <<-, then all leading tab characters are stripped from input lines and the line containing delimiter. This allows here-documents within shell scripts to be indented in a natural fashion.

因此，您需要从here文档中删除尾随空格或用制表符代替它们。

ssh $REMOTE_USER@$REMOTE_HOST "
cat > hooks/post-receive <<EOF
#!/bin/bash
git checkout -f
EOF
chmod +x hooks/post-receive"

# or,

ssh $REMOTE_USER@$REMOTE_HOST "
cat > hooks/post-receive <<-EOF
    #!/bin/bash
    git checkout -f
    EOF
    chmod +x hooks/post-receive"