Menu
I just started doing shell scripts and getting unknown operand error while using regex in if statement. i searched google but did not get anything
IP="172.21.1.1"
if [[ "$IP" =~ /d ]] ; then
echo "qqq"
fi
Getting error as
sh: =~: unknown operand
Bash version is : BusyBox v1.19.3 (2012-01-31 08:57:52 PST) built-in shell (ash)
879
Basic Operators in Shell Scripting. There are 5 basic operators in bash/shell scripting: Arithmetic Operators : These operators are used to perform normal arithmetics/mathematical operations. There are 7 arithmetic operators: Addition (+): Binary operation used to add two operands. Subtraction (-): Binary operation used to subtract two operands.
The error that you get comes from the fact that the script doesn't output anything, which means that the command substitution will be empty. Since it's unquoted, the command that the shell will try to execute will look like This is a syntax error. and the shell is not able to compare the empty string as an integer.
The error that you get comes from the fact that the script doesn't output anything, which means that the command substitution will be empty. Since it's unquoted, the command that the shell will try to execute will look like
You may read the if statement as "If the script did succeed". The error that you get comes from the fact that the script doesn't output anything, which means that the command substitution will be empty. Since it's unquoted, the command that the shell will try to execute will look like
This is happening because the operator =~ doesn't existe for bash.
As see you are trying to use a Regex to compare your variables. I recommend to use the expr command. Here is an example:
IP="172.21.1.1"
if [[ $(expr match "$IP" 'my_regex') != 0 ]]; then echo "qqq"; fi;
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
