How to identify the name of the first variable in a datasheet?

[Giang Dao]

How can I write a code with the meaning like this:

Use "Path Excel Sheet.xlsx",
If name of the first variable is X, do "this command", else do "that command"

I'm stuck at some code identifying the name of the first variable. Many thanks in advance.

[Andrew Musau]

sysuse auto
foreach var of varlist _all {
local vars  "`vars' `var'"
}
di "`vars'"

local first: word 1 of `vars'
di "`first'"

. di "`vars'"
 make price mpg rep78 headroom trunk weight length turn displacement gear_ratio foreign

. local first: word 1 of `vars'
 
. di "`first'"
make

[Giang Dao]

Thank you very much!