./check_disk1[55]: 0403-057 Syntax error at line 55 : `(' is not expected.

#!/bin/ksh

PROGNAME=`basename $0`
STATE_OK=0
STATE_WARNING=1
STATE_CRITICAL=2
STATE_UNKNOWN=3

OS=$(uname)
AWK="/usr/bin/awk"
GREP="/usr/bin/grep"
DF="/usr/bin/df"

#############################
# Functions
#############################

print_help() {
echo ""
echo "$PROGNAME is a Nagios plugin used to check disk used space by"
echo "processing the output of \"df\" command. It runs on UNIX, Linux"
echo "and BSD platforms and reports the following performance data:"
echo "- total disk space (Bytes)"
echo "- currently used disk space (Bytes)"
echo "- currently used disk space (%)"
echo " "
echo "$PROGNAME Warning Critical Partition"
echo " "
}

WarnSpace=$1
CritSpace=$2
Partition=$3

CRITICAL_CONDITION=95
WARNING_CONDITION=90

# float number comparison
function fcomp() {
    $AWK -v n1=$1 -v n2=$2 'BEGIN{ if (n1<=n2) exit 0; exit 1}'
}


#formats bytes => KBytes, MBytes, GBytes, TBytes
function UNIX_btokmgt() {
        if [ $1 -lt 512 ]; then                  #KBytes
             echo "${1}KB"
        elif [ $1 -lt 262144 ]; then             #MBytes
             echo "$1" | $AWK '{printf "%.1fMB", $1/512}'
        elif [ $1 -lt 134217728 ]; then          #GBytes
             echo "$1" | $AWK '{printf "%.1fGB", ($1*512)/1073741824}'
        elif [ $1 -gt 134217728 ]; then        #TBytes
             echo "$1" | $AWK '{printf "%.1fTB",($1*512)/1099511627776}'
        fi
}

function btokmgt() {
        if [ $1 -lt 1024 ]; then                 #Bytes
             echo "${1}B"
        elif [ $1 -lt 1048576 ]; then            #KBytes
             echo "$1" | $AWK '{printf "%.1fKB", $1/1024}'
        elif [ $1 -lt 1073741824 ]; then         #MBytes
             echo "$1" | $AWK '{printf "%.1fMB", $1/1048576}'
        elif [ $1 -lt 1099511627776 ]; then      #GBytes
             echo "$1" | $AWK '{printf "%.1fGB", $1/1073741824}'
        elif [ $1 -lt 1125899906842624 ]; then   #TBytes
             echo "$1" | $AWK '{printf "%.1fTB", $1/1099511627776}'
        fi
}

if [ $# -lt 1 ]; then
    print_help
    RESULT="UNKNOWN"
    RETURN_STATUS=$STATE_UNKNOWN
    exit $RETURN_STATUS
fi


if fcomp $WarnSpace 0
then
    WarnSpace=0
fi
if fcomp 100 $WarnSpace
then
    WarnSpace=100
fi

if fcomp $CritSpace 0
then
    CritSpace=0
fi
if fcomp 100 $CritSpace
then
    CritSpace=100
fi

if fcomp $CritSpace $WarnSpace
then
    WarnSpace=$CritSpace
fi


if [[ $OS == AIX ]]; then
    USEDTXT=`$DF -P $Partition 2>&1`
        #echo "USEDTXT value is $USEDTXT"
else
    USEDTXT=`$DF -P -B 1 $Partition 2>&1`
fi

#if [ $? != 0 ]
#then
#        echo "Error! Disk partition $Partition can't be checked. Does it exist?"
#        exit 3
#fi

if [[ $OS == AIX ]]; then
        CAPACITY=$(df "$Partition" | awk '!/Filesystem/ { print $4 }' | sed 's/%//')
#               echo "CAPACITY is $CAPACITY"
else
        CAPACITY=$(df -h "$Partition" | awk '!/Filesystem/ { print $4 }' | sed 's/%//')
fi


SpaceTxt=`echo "$USEDTXT" | $GREP "${Partition}\$"`
SpaceTotal=`echo "$SpaceTxt" | $AWK '{print $2}'`
SpaceUsed=`echo "$SpaceTxt" | $AWK '{print $3}'`
SpaceFree=`echo "$SpaceTxt" | $AWK '{print $4}'`
SpaceUsedProc=`echo "$SpaceTxt" | $AWK '{printf "%.1f", $3*100/$2}'`

SpaceFreeProc=`echo "$SpaceTxt" | $AWK '{printf "%.1f", $4*100/$2}'`

WarnSpaceAbs=`echo "$SpaceTotal $WarnSpace" | $AWK '{printf "%d", $1*$2/100}'`
CritSpaceAbs=`echo "$SpaceTotal $CritSpace" | $AWK '{printf "%d", $1*$2/100}'`
#echo "SpaceTxt value is $SpaceTxt"
#echo "SpaceTotal value is $SpaceTotal"
#echo "SpaceUsed value is $SpaceUsed"
#echo "SpaceFree value is $SpaceFree"
#echo "SpaceUsedProc value is $SpaceUsedProc"

if [[ $OS == AIX ]]; then
    SpaceTotal_F=`UNIX_btokmgt $SpaceTotal`
    SpaceUsed_F=`UNIX_btokmgt $SpaceUsed`
    SpaceFree_F=`UNIX_btokmgt $SpaceFree`
#       echo "SpaceTotal_F is $SpaceTotal_F"
#       echo "SpaceUsed_F is $SpaceUsed_F"
#       echo "SpaceFree_F is $SpaceFree_F"
else
    SpaceTotal_F=`btokmgt $SpaceTotal`
    SpaceUsed_F=`btokmgt $SpaceUsed`
    SpaceFree_F=`btokmgt $SpaceFree`
fi

PerfData="'used space'=${SpaceUsed}B;${WarnSpaceAbs};${CritSpaceAbs};0;${SpaceTotal} 'used space (pct.)'=${SpaceUsedProc}%;${WarnSpace};${CritSpace};0;100"
#echo "PerfData is $PerfData"
WarnSpace=$1
CritSpace=$2
CRITICAL_CONDITION=95
WARNING_CONDITION=90




if [[ $CritSpace < $CAPACITY ]]; then
    PS_STATUS="'$Partition' is at ${CAPACITY}% capacity, total ${SpaceTotal_F}, used ${SpaceUsed_F} (${SpaceUsedProc}%), free ${SpaceFree_F} (${SpaceFreeProc}%) | $PerfData"
    RESULT="CRITICAL"
    RETURN_STATUS=$STATE_CRITICAL
    FINAL_STATUS="$RESULT: ${PS_STATUS}"
    echo $FINAL_STATUS
    exit $RETURN_STATUS
elif [[ $WarnSpace < $CAPACITY ]]; then
    PS_STATUS="'$Partition' is at ${CAPACITY}% capacity, total ${SpaceTotal_F}, used ${SpaceUsed_F} (${SpaceUsedProc}%), free ${SpaceFree_F} (${SpaceFreeProc}%) | $PerfData"
    RESULT="WARNING"
    RETURN_STATUS=$STATE_WARNING
    FINAL_STATUS="$RESULT: ${PS_STATUS}"
    echo $FINAL_STATUS
    exit $RETURN_STATUS
else
    PS_STATUS="'$Partition' is at ${CAPACITY}% capacity, total ${SpaceTotal_F}, used ${SpaceUsed_F} (${SpaceUsedProc}%), free ${SpaceFree_F} (${SpaceFreeProc}%) | $PerfData"
    RESULT="OK"
    RETURN_STATUS=$STATE_OK
    FINAL_STATUS="$RESULT: ${PS_STATUS}"
    echo $FINAL_STATUS
    exit $RETURN_STATUS
fi

echo $FINAL_STATUS
exit $RETURN_STATUS