Question

Please help me to find problem

t1=$(sort -k 2,2 f.txt|head -1|cut -d" " -f3)
while read x
do
t2=$(echo $x|cut -d" " -f2)
if [ $t2 -ge $t1 ] ; then
  p=$(echo $x|cut -d" " -f1)
  echo -n $p " "
fi
done <f.txt

f.txt

F1 13

G 13

H 0

I am geeting following error

-sbash: [: 13: unary operator expected
-sbash: [: 13: unary operator expected

without H 0 row it work correct

Answer 1

‘unary operator expected’ is the error when you use a binary operator with only a single operand.

This means that either t2 or t1 is empty. To cause an empty variable to not disappear, use default notation ${VARIABLE:-DEFAULT} to give them a default value:

if [ ${t2:-0} -ge ${t1:-0} ]; then