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tcldereference
DurgaDatta
DurgaDatta

Reputation: 4170

Tcl dereferencing: How to dereference a variable inside a string

I have following situation:

% set a 20
20
% set in_word "Value of a is \$a"
Value of a is $a

Now, I would like to print (or set this string to another variable), Value of a is 20 by operating on the variable in_word.

The similar (possibly the simpler case) of dereferecning is covered in an essay which is also linked in Tclers wik here. The case covered there is of this nature:

% set x y
y
% set y 20
20
% set [set x]
20
%

This case parallels with my question in that I have a string with a variable inside it, instead of a direct variable. I am not sure how I can apply the idea in this case to my problem. I tried using eval but I did not get the effect I wanted.

Upvotes: 1

Views: 982

Answers (2)

Kiran Adhikari
Kiran Adhikari

Reputation: 49

If you put anything within "", it interprets the $args. 

% set a 20
20

% set in_word "Value of a is $a"
Value of a is 20

Upvotes: -1

CapEnt
CapEnt

Reputation: 287

The subst command is what you are looking for:

puts [subst $in_word]

Upvotes: 2

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