Please tell, how it is possible to execute it For example the person entered 24 and 24 appeared on the screen "ok", on the contrary when entered 24 and 23 person received "not ok"? I tried as follows:
#!/bin/bash
read a
read b
if <("$a" == "$b")>.*<\1>
then
echo ok
else
echo not ok
fi
CodePudding user response:
You only need a direct variable comparison:
#!/bin/bash
read a
read b
if [ "$a" -eq "$b" ];
then
echo ok
else
echo not ok
fi
Back-reference is for complex requirements like this:
https://javascript.info/regexp-backreferences
Also regex is not used to compare different values. It is used to compare the incoming value with a predefined, expected or desired pattern like this example in which the expected pattern is a mail and the incoming value could be any string
if [[ "$1" =~ ^[a-zA-Z0-9._% -] @[a-zA-Z0-9.-] \.[a-zA-Z]{2,4}$ ]]
then
echo "Email address $email is valid."
break
else
echo "Email address $email is invalid."
fi