How it is possible to join the string from a variable with a list of strings? More exactly, I have this:
set Dir "02_E12_SP_el";
set OutputDir [join {$Dir _ forcesElem21.out} ""];
I want OutputDir to be "02_E12_SP_el_forcesElem21.out", but instead I obtain "$Dir_forcesElem21.out"
When you wrap a variable in braces {}, it will not be interpreted as a variable.
{$Dir _ forcesElem21.out}
creates a static list.
There are several methods.
The join command concatenates a list of elements together. It is more useful when the list is already built and has the flexibility to specify what to join with (e.g. {, }).
set var 123
set mystr abc
set newstr [join [list $mystr def $var] {}]
Direct concatentation:
set var 123
set mystr abc$var
set mystr ${var}abc
Or the append command:
set var 123
set mystr abc
append mystr $var
set OutputDir ${Dir}_forcesElem21.out
string cat $Dir _ forcesElem21.out to get the value you wanted. If your list of elements is itself in a variable, use string cat {*}$elements. See tcl.tk/man/tcl/TclCmd/string.htm#M5.
file joinwhich is aware of a number of subtleties that aren't immediately obvious.