# set command

The set BASIC program modifies the value
of a D3 user shell variable.

## Syntax

```
set {variable.name{={"|’}variable.value{"|’}}}
```
CAUTION: When setting a variable, it is important
never to use the @ or @$ prefix
as would be required if one were using that variable.

If set is executed with no arguments, then it functions identically
to the penv command. This displays a list
of the currently set user variables and their values.

If set is executed with a variable name, but with no variable
value, then the variable is assigned a null value. To completely remove
a variable, use the unset command.

It is
possible to create variable values which contain other variable names
for later expansion. To do this, enclose the entire variable value
within single quotation marks. The quotation marks prevent the variable
names from being translated immediately by the set command.

## Example(s)

```
set
mycv=1
display @$mycv
1
```

---
Source: https://d3codex.com/tcl/set-command/ - part of the D3Codex reference.