Shell Programming and Scripting

THRESHOLD="1.25"
ratio=$( echo "scale=2; ${prev}/${current}" | bc )
 
if [ $(echo "${ratio} > ${THRESHOLD}" | bc ) -eq 1 ]; then 
    split_date=`echo ${line} | cut -d, -f2`
fi

script/split_checks.sh: line 62: [: -eq: unary operator expected
(standard_in) 2: parse error
(standard_in) 1: parse error

if [ $(echo "${ratio} > ${THRESHOLD}" | bc ) -eq 1 ]; the

if [ ${ratio} > ${THRESHOLD} ]; then

if [ $(echo "${ratio} > ${THRESHOLD}" | bc ) -eq 1 ]; then

if [ $ratio -le $THRESHOLD ]; then

#!/bin/sh

a="1.23"
b="2.45"

if [ $a > $b ]; then 
    echo "string compare: greater : $a > $b"
else
    echo "string compare: smaller : $a < $b"    
fi

if [ $a -ge $b ]; then 
    echo "int compare: greater : $a > $b"
else
    echo "int compare: smaller : $a < $b"   
fi

if [ $( echo "$a > $b" | bc ) -eq 1 ]; then 
    echo "using bc: greater : $a > $b"
else
    echo "using bc: smaller : $a < $b"
fi

exit 0

$ ./test.sh
string compare: greater : 1.23 > 2.45
./test.sh: line 12: [: 1.23: integer expression expected
int compare: smaller : 1.23 < 2.45
using bc: smaller : 1.23 < 2.45

(standard_in) 2: parse error
(standard_in) 1: parse error

if [ $(echo "${ratio} > ${THRESHOLD}" | bc ) -eq 1 ]; then

(standard_in) 2: parse error
(standard_in) 1: parse error

$ echo '1 > 2' | bc
syntax error on line 1, teletype