navi-cheats/heredoc.cheat at main · pushou/navi-cheats · GitHub

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%  bash,heredoc,pushou from https://linuxize.com/post/bash-heredoc/

# heredoc simple expand
cat << EOF
The current working directory is: $PWD
You are logged in as: $(whoami)
EOF

# heredoc do not expand parameter
cat << "EOF"
The current working directory is: $PWD
You are logged in as: $(whoami)
EOF

# heredoc keep indent safe
cat <<- "EOF"
  The current working directory is: $PWD
  You are logged in as: $(whoami)
EOF

# heredoc redirect to a file
cat << EOF > /tmp/file.txt
The current working directory is: $PWD
You are logged in as: $(whoami)
EOF

# heredoc sed
cat <<'EOF' |  sed 's/l/e/g'
Hello
World
EOF

# heredoc ssh
ssh -T user@host.com << EOF
echo "The current local working directory is: $PWD"
echo "The current remote working directory is: \$PWD"
EOF