`command -v` is the portable, fast way to check whether a binary is on $PATH. Avoid `which` (its behavior varies between systems).
Bash
need() {
command -v "$1" >/dev/null 2>&1 || {
echo "Required command not found: $1" >&2
exit 1
}
}
# Use at top of script — fail fast if deps are missing
need jq
need curl
need rsync
# Or branch on optional deps
if command -v fd >/dev/null; then
fd --type f
else
find . -type f
fiSave your own code snippets
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