F5 is upgrading its customer support chat feature on My.F5.com. Chat support will be unavailable from 6am-10am PST on 1/20/26. Refer to K000159584 for details.

Forum Discussion

uni's avatar
uni
Icon for Altocumulus rankAltocumulus
Sep 12, 2007

Preventing interpreting variable as TCL

I have an iRule which is parsing the each field in a URI query. I am getting an occasional problem with a TCL error if $parameter starts with "-", as the interpreter assumes it is an option to the ...
application delivery
dev
devops
iRules
uni's avatar
uni
Icon for Altocumulus rankAltocumulus
Oct 10, 2007
For anyone who cares, the solution to this was to add "--" after the switch statement, to ensure it parses the next item as the test value rather than one of the command switches:

switch -- [string tolower [lindex [split ${parameter} "="] 0]] {

hoolio's test didn't pick it up, because it was a problem with the switch command syntax, which he didn't use in his test.

Joe's suggestion is not correct: the {curly braces} protect the variable name, not the variable contents.

Thanks for your suggestions.