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#!/bin/sh
# less is a pager; with a non-tty output and one-screen content (-F quits
# at once) it dumps the input verbatim, which we can check without a
# terminal. Payloads stay small so less never blocks waiting to page.
LESS_BIN=/usr/libexec/less-gnu
[ -x "$LESS_BIN" ] || { echo "FAIL: $LESS_BIN not installed"; exit 1; }
payload="$(printf 'alpha\nbeta\ngamma\ndelta')"
# from stdin
out="$(printf '%s\n' "$payload" | "$LESS_BIN" -F)"
[ "$out" = "$payload" ] || { echo "FAIL: less mangled stdin"; exit 1; }
# from a file argument
tmp="$(mktemp)"; printf '%s\n' "$payload" > "$tmp"
out="$("$LESS_BIN" -F "$tmp")"; rm -f "$tmp"
[ "$out" = "$payload" ] || { echo "FAIL: less mangled a file argument"; exit 1; }
echo "less: pass-through OK"
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