Windows command prompt: Using a variable set in the same line of a one-liner

Question

Okay, I learned that one can use & or && to combine multiple commands into a single line, but it seems that variables that are set

Answer 1

I could not get an IF command to work with either call or cmd /v /c so I would like to offer another option for those who may need it: use FOR /F to declare and use a variable within a single command. For example:

FOR /F %i IN ('echo 123') DO (IF %i==123 echo done)

The %i is the variable that is set with the result of the IN command, which in this example is 'echo 123'.

For values with single quotes or spaces, use the "usebackq tokens=*" flag to put the command in backquotes:

FOR /F "usebackq tokens=*" %i IN (`echo "hello, ' ' world!"`) DO (IF %i=="hello, ' ' world!" echo done)