Tcl/Tk Hello world in a line

Creating classic hello world program using GUI in Tcl/Tk can be done in few lines or may be only a line !

Oneliner can do below.

pack [button .b1 -text “Hello World” -command exit -width 50]

This line can be read : pack a button named .b1 with hello world text and exit command when clicked.

Save it to hello_oneline.tcl then run on command prompt : wish hello_oneline.tcl.

Voila!

Click the button and the window will close.

Bye ..

Installing TCL on OpenBSD 6.6

To bring tcl/tk programming language and some database connectivity for tcl on OpenBSD do command below as root :

pkg_add tcl tk sqlite3-tcl pgtcl

OpenBSD 6.6 can install tcl/tk 8.5 and 8.6.

Two extra package named sqlite3-tcl and pgtcl will give tcl capability to work with sqlite3 database and postgresql database.

Tdbc also a good choice for database connectivity. Tdbc packages on OpenBSD available for mysql, postgres, sqlite3. To add tdbc , we can do pkg_add tdbc-postgres tdbc-mysql tdbc-sqlite3.

Later will write more about tcl/tk.