systype.sh

APUE(第二版)的随书源代码,与第一版的代码相比增加了一些章节的代码(详见第二版的说明)

 # (leading space required for Xenix /bin/sh)

#
# Determine the type of *ix operating system that we're
# running on, and echo an appropriate value.
# This script is intended to be used in Makefiles.
# (This is a kludge.  Gotta be a better way.)
#

if (test -f /vmunix)
then
	if (test -f /usr/bin/sun)
	then
		echo "sun"
	elif (test -f /bsd)
	then
		echo "bsdi"
	else
		echo "bsd"
	fi
elif (test -f /xenix)
then
	echo "xenix"
elif (test -d /proc)
then
	echo "svr4"
elif (test -f /etc/lddrv)
then
	echo "unixpc"
fi