TAB is something you don't want to send thru *shell*

[Dan Jacobson]

What is the big problem with TAB in *shell* now (21.2)?
No matter how you get a TAB into the command line, ^Q^I or paste, you
are going to get the 329 etc. possibilities treatment:
$ cat -t /tmp/a
 echo '^I'|cat -vte
$ cat /tmp/a
 echo ' '|cat -vte  <---- ok now cut and paste this line
                          at the next prompt and hit RET
$  echo '       '|cat -vte
Display all 329 possibilities? (y or n)
.AbiSuite/                               dianlidiff.txt ...
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