#!/bin/bash
help () {
cat <<EOF

############################### lslibc #######################################
## lslibc: A script to determine the version of C standard library          ##
## in use on the current system.                                            ##
##                                                                          ##
##   Usage: tty1$ lslibc [-vfh]                                             ##
##     Options: -v verbose description of C standard library.               ##
##              -f list file name of current C standard library (libc.so).  ##
##              -p output version descriptor string from libc.so file.      ##
##              -h help: output this usage information and exit.            ##
##############################################################################

EOF
exit 0
}

tmp="$(ldd /bin/sh | grep libc.so 2> /dev/null)"
LCFile=$(expr "$tmp" : '[^/]*\(/[^ ]*\)')
tmp="$(strings $LCFile | grep -i 'c library')"

OsLibcMajor=$(expr "$tmp" : '.* \([0-9][0-9]*\)')
OsLibcMinor=$(expr "$tmp" : '.* [0-9][0-9]*\.\([0-9][0-9]*\)')

if  [ $OsLibcMajor = 2 ]
then OsLibcMajor=6    ## 2 is the glibc version equivelent of LibC 6
fi

case $1 in
  -h) help ;;
  -f) echo "$LCFile" ;;
  -p) echo "$tmp" ;;
  -v) echo "libc version is $OsLibcMajor.$OsLibcMinor " ;;
   *) echo "$OsLibcMajor.$OsLibcMinor " ;;
esac