.tip

Mar 24, 2026 · one of the small things

Quote the heredoc delimiter unless you want expansion

A heredoc with <<EOF expands $variables and backticks inside it. <<'EOF' passes the text through untouched, which is what you want for a script, a config, or anything with a dollar sign in it.

cat > deploy.sh <<'EOF'
echo "$HOME is not expanded here"
EOF

Most heredoc bugs are the quotes on that one word.

shell

~/tips/today — 2026-09-04

~cat tips/today

Session cookies: HttpOnly, Secure, SameSite=Lax

securityhttp

Three attributes, each closing a class of attack. HttpOnly keeps scripts from reading it. Secure keeps it off plain HTTP. SameSite=Lax stops it being sent on cross-site POSTs, which is most CSRF.

Set-Cookie: session=...; HttpOnly; Secure; SameSite=Lax; Path=/; Max-Age=1209600

Strict breaks arriving from an external link while logged in. Lax is the default worth keeping.

↵ open y yesterday l ls /tips

esc close