#!/usr/bin/awk -f

  # SPDX-License-Identifier: GPL-2.0

  # Before running this script please ensure that your PATH is
  # typical as you use for compilation/installation. I use
  # /bin /sbin /usr/bin /usr/sbin /usr/local/bin, but it may
  # differ on your system.
  
  BEGIN {
  	usage = "If some fields are empty or look unusual you may have an old version.
  "
  	usage = usage "Compare to the current minimal requirements in Documentation/Changes.
  "
  	print usage
  
  	system("uname -a")
  	printf("
  ")

  	vernum = "[0-9]+([.]?[0-9]+)+"

  	libc = "libc[.]so[.][0-9]+$"
  	libcpp = "(libg|stdc)[+]+[.]so[.][0-9]+$"

  	printversion("GNU C", version("gcc -dumpversion"))
  	printversion("GNU Make", version("make --version"))
  	printversion("Binutils", version("ld -v"))
  	printversion("Util-linux", version("mount --version"))
  	printversion("Mount", version("mount --version"))
  	printversion("Module-init-tools", version("depmod -V"))
  	printversion("E2fsprogs", version("tune2fs"))
  	printversion("Jfsutils", version("fsck.jfs -V"))
  	printversion("Reiserfsprogs", version("reiserfsck -V"))
  	printversion("Reiser4fsprogs", version("fsck.reiser4 -V"))
  	printversion("Xfsprogs", version("xfs_db -V"))
  	printversion("Pcmciautils", version("pccardctl -V"))
  	printversion("Pcmcia-cs", version("cardmgr -V"))
  	printversion("Quota-tools", version("quota -V"))
  	printversion("PPP", version("pppd --version"))
  	printversion("Isdn4k-utils", version("isdnctrl"))
  	printversion("Nfs-utils", version("showmount --version"))

  	printversion("Bison", version("bison --version"))
  	printversion("Flex", version("flex --version"))

  	while ("ldconfig -p 2>/dev/null" | getline > 0) {
  		if ($NF ~ libc && !seen[ver = version("readlink " $NF)]++)
  			printversion("Linux C Library", ver)
  		else if ($NF ~ libcpp && !seen[ver = version("readlink " $NF)]++)
  			printversion("Linux C++ Library", ver)

  	}

  	printversion("Dynamic linker (ldd)", version("ldd --version"))

  	printversion("Procps", version("ps --version"))
  	printversion("Net-tools", version("ifconfig --version"))
  	printversion("Kbd", version("loadkeys -V"))
  	printversion("Console-tools", version("loadkeys -V"))
  	printversion("Oprofile", version("oprofiled --version"))
  	printversion("Sh-utils", version("expr --v"))
  	printversion("Udev", version("udevadm --version"))
  	printversion("Wireless-tools", version("iwconfig --version"))

  	while ("sort /proc/modules" | getline > 0) {
  		mods = mods sep $1
  		sep = " "

  	}

  	printversion("Modules Loaded", mods)

  }
  
  function version(cmd,    ver) {

  	cmd = cmd " 2>&1"

  	while (cmd | getline > 0) {

  		if (match($0, vernum)) {

  			ver = substr($0, RSTART, RLENGTH)
  			break
  		}
  	}
  	close(cmd)
  	return ver
  }
  
  function printversion(name, value,  ofmt) {
  	if (value != "") {
  		ofmt = "%-20s\t%s
  "
  		printf(ofmt, name, value)
  	}
  }