Does Tcl matter to system administrators? Absolutely; in fact, CL argues [L1 ] that Tc is the single most useful language for them to learn.
[... details ...]
[... Windows, too. and MacOS. And OpenVMS and OS/400! ...]
[ Don Libes' papers on sysad: http://expect.nist.gov/doc/autoexpect.pdf ; http://expect.nist.gov/doc/bgpasswd.ps ; http://expect.nist.gov/doc/sysadm.ps ; ... others ...]