I want to use a variable as comparison operator. Is it possible? Something like:
x=10 y=20 t="<" res=`expr $x $y $t` or
x=10 y=20 t="-lt" if [ $x $y $t ]; then .. fi Whichever approach is fine by me.
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1 Answer
Why have you not just tested* it? Yes, it is possible. Shell is interpreted language. Command test (for which [ is an alias) takes arguments just as any other command. Those can be variables as well.
Example:
#!/usr/bin/env sh x=10 y=20 t="-lt" if [ $x $t $y ]; then echo "a" fi if [ $y $t $x ]; then echo "b" else echo "c" fi t="-ge" if [ $y $t $x ]; then echo "d" fi Output:
a c d * Your example don't work, because you have operator (variable $t) after the values (variables $x and $y), not between them.
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Nir
What if I want to compare decimals?