cmdline

#!/bin/sh

if [ $# -eq 0 ]; then
    cat /proc/cmdline
    exit $?
fi

print_cmdline() {
    for pid; do
        if [ -r "/proc/${pid}/cmdline" -a -n "$(cat "/proc/${pid}/cmdline")" ]; then
            echo "[pid ${pid}]"
            sed -e 's|[^[:print:]]\+| |g' /proc/${pid}/cmdline
            echo
        elif [ -r "/proc/${pid}/cmdline" ]; then
            echo "[pid ${pid}] : empty." >&2
        else
            echo "[pid ${pid}] : Permission denied." >&2
        fi
    done
}

for x; do
    if echo "${x}" | grep -q '^[1-9][0-9]*$'; then
        if [ -d "/proc/${x}" ]; then
            print_cmdline ${x}
        else
            echo "${0##*/}: process ${x} does not exist." >&2
        fi

    elif pidof "${x}" >/dev/null; then
        print_cmdline $(pidof ${x})
    else
        echo "${0##*/}: process ${x} does not exist." >&2
    fi
done

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