Conditinally execute statements.

[HARDY8118]

An if...fi block to execute statements conditionally can be added. For example:

script
    .If(script.File("key.txt")=="")
    .Then()
        .Echo(token)
        .WriteFile("key.txt")
    .Fi()

Please let me know if this can be useful.

[bitfield]

Nice suggestion, @HARDY8118! We do have IfExists already—though it's in the opposite sense to what you want.

[HARDY8118]

I can give a try implementing it