How do you take variable names dynamically?

How do you take variable names dynamically?

In JavaScript, dynamic variable names can be achieved by using 2 methods/ways given below.

1. eval(): The eval() function evaluates JavaScript code represented as a string in the parameter. A string is passed as a parameter to eval().
2. Window object: JavaScript always has a global object defined.

Which variable automatically holds name of the script?

underscore variable
The underscore variable is set at shell startup and contains the absolute file name of the shell or script being executed as passed in the argument list. Subsequently, it expands to the last argument to the previous command, after expansion.

How do you set a variable in sh shell?

Unix / Linux – Using Shell Variables

1. Defining Variables. Variables are defined as follows − variable_name=variable_value.
2. Accessing Values. To access the value stored in a variable, prefix its name with the dollar sign ($) −
3. Read-only Variables.
4. Unsetting Variables.

Is an illegal variable name?

If you give a variable an illegal name, you get a syntax error. In the example below, each of the variable names is illegal. 76trombones is illegal because it does not begin with a letter. more$ is illegal because it contains an illegal character, the dollar sign.

How can I generate new variable names in a shell?

Bash uses the value of the variable formed from the rest of parameter as the name of the variable; this variable is then expanded and that value is used in the rest of the substitution, rather than the value of parameter itself. This is known as indirect expansion.” You’re using the value of i as if it were an array index.

How to create dynamic variable names in Bash?

If you can’t use associative arrays (e.g., you must support bash 3), you can use declare to create dynamic variable names: and use indirect parameter expansion to access the value. See BashFAQ: Indirection – Evaluating indirect/reference variables.

Is it possible to generate variable names in the fly?

I’m trying to generate dynamic var names in a shell script to process a set of files with distinct names in a loop as follows: Is it possible generate var names in the fly? “If the first character of parameter is an exclamation point (!), a level of variable indirection is introduced.

How is the name of a variable expanded in Bash?

Bash uses the value of the variable formed from the rest of parameter as the name of the variable; this variable is then expanded and that value is used in the rest of the substitution, rather than the value of parameter itself.