Tcl is a command based language - everything you do uses a command that starts with a command word such as puts to output information or set to assign a value to a variable. The while command (yes, it really is a command) lets you define a block of code that's to be run repeatedly while a condition is true, and so on.

As well as storing Tcl programs in a file, you can type Tcl commands in at an interactive prompt ... and if you do so, you're allowed to shorten the name of your commands provided they remain non-ambiguous. This is why Tcl will let you pu but not p ....


earth-wind-and-fire:~ grahamellis$ tclsh
% pu daily
daily
% p hourly
ambiguous command name "p": package pid proc puts pwd
% exit
earth-wind-and-fire:~ grahamellis$


Please excuse the - err - lavatorial sense of humour this example shows. It came up (I confess I originated it) on a Tcl Course that I've just completed in Scotland.
(written 2005-06-30 15:53:35)

 T214 - Tcl/Tk - Other Facilities in Tcl

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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