Wrap printf with ANSI escape codes for color and bold. Auto-disable if stdout isn't a TTY (so piping to a file doesn't pollute it with escape sequences).
Bash
# Detect if we can use color
if [[ -t 1 ]]; then
RED=$'\e[31m'; GRN=$'\e[32m'; YEL=$'\e[33m'; BLU=$'\e[34m'
BOLD=$'\e[1m'; DIM=$'\e[2m'; RST=$'\e[0m'
else
RED=""; GRN=""; YEL=""; BLU=""; BOLD=""; DIM=""; RST=""
fi
ok() { printf "${GRN}✓${RST} %s\n" "$*"; }
warn() { printf "${YEL}⚠${RST} %s\n" "$*"; }
err() { printf "${RED}✗${RST} %s\n" "$*" >&2; }
info() { printf "${BLU}ℹ${RST} %s\n" "$*"; }
hdr() { printf "${BOLD}%s${RST}\n" "$*"; }
ok "Build completed in 12s"
warn "Deprecation: rename module before next release"
err "Database connection refused"
info "Loaded config from /etc/myapp.toml"
hdr "== Deployment Summary =="Save your own code snippets
Create a free account and build your private vault. Share publicly whenever you want.