#!/usr/bin/env bash set -euo pipefail NAME="hello" VERSION="1.0.0" print_help() { cat <&2 exit 2 fi GREETING_NAME="$1" shift ;; --) shift break ;; -*) echo "Unknown option: $1" >&2 exit 2 ;; *) # positional arg becomes name GREETING_NAME="$1" shift ;; esac done # If there's stdin, read and print each line prefixed if ! tty -s && ! [ -t 0 ]; then STDIN_CONTENT=$(cat -) echo "$STDIN_CONTENT" | while IFS= read -r line; do echo "$NAME: $line" done exit 0 fi echo "Hello, $GREETING_NAME!" .PHONY: install uninstall PREFIX ?= /usr/local BINDIR ?= $(PREFIX)/bin install: install -d $(BINDIR) install -m 755 bin/hello $(BINDIR)/hello uninstall: rm -f $(BINDIR)/hello # hello executable script A small POSIX-compatible CLI script that greets a name or processes piped input. Installation: 1. Make the script executable: chmod +x bin/hello 2. Optionally install system-wide (may require sudo): make install Usage: - Run locally: ./bin/hello ./bin/hello -n Alice ./bin/hello Bob - With stdin: echo "line 1" | ./bin/hello - Show help: ./bin/hello --help License: MIT