For 2023 - we are now fully retired from IT training. We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.
Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!
I am also active in many other area and still look after a lot of web sites - you can find an index ((here)) |
pu daily and p hourly
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, updated 2006-06-05)
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles T214 - Tcl/Tk - Other Facilities in Tcl [239] What and why for the epoch - (2005-03-08) [366] Error handling in Tcl through catch - (2005-07-02) [461] Shortened interactive commands - (2005-10-11) [748] Getting rid of variables after you have finished with them - (2006-06-06) [782] Converting between Hex and Decimal in Tcl - (2006-06-28) [1277] AgtInvoke - a command to drive Agilent Tcl software extensions - (2007-07-26) [1334] Stable sorting - Tcl, Perl and others - (2007-09-06) [1338] Handling Binary data in Tcl (with a note on C) - (2007-09-09) [2467] Tcl - catching an error before your program crashes - (2009-10-22) [3287] Exceptions - Tcl style - (2011-05-12) [3570] Trapping errors in Tcl - the safety net that catch provides - (2012-01-06) [3583] Expanding a list of parameters in Tcl - {*} and eval - (2012-01-17) [4207] Exception handling in Tcl - (2013-11-14) [4523] Catching failed commands and not crashing the program in Tcl - (2015-10-10) [4525] What does Tcl do if you try to run a command that is not defined? - (2015-10-10) [4762] Coverage map in Tcl - how many times has each proc been called? - (2017-09-28)
Some other Articles
Vacation WeekAjaxLetterbox Picturespu daily and p hourlyGreetings from EdinburghThe ireallyreallywanna operatorBinary Large Objects or barsSpring turns to SummerChicken soup without the religion
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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.
Link to Ezine home page (for reading).
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