Sunday, July 29, 2018
Bash Script Creating and using Read only variables
Bash Script Creating and using Read only variables
Here is an simple bash script showing the trick to create the read-only variable, feel free to copy and use this script.
$ cat declare.sh
#!/bin/bash
# Declare the variable as readonly
declare -r AGE=25
echo $AGE
# Try to change the value of this readonly variable
# you should get an error message
AGE=34
echo $AGE
Output: $ ./declare.sh
./declare.sh
25
./declare.sh: line 9: AGE: readonly variable
25
#!/bin/bash
# Declare the variable as readonly
declare -r AGE=25
echo $AGE
# Try to change the value of this readonly variable
# you should get an error message
AGE=34
echo $AGE
Output: $ ./declare.sh
./declare.sh
25
./declare.sh: line 9: AGE: readonly variable
25
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