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TCL - Question regarding Braces {}

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# 1  
Old 12-06-2012
TCL - Question regarding Braces {}
Hello everyone,

What is the difference between these two tcl commands:

(A) --> puts "ERROR!!! ${current_name}/${opt} is not found."
(B) --> puts "ERROR!!! $current_name/$opt is not found."

Are the braces needed to be put? Or both A and B has the same output?
# 2  
Old 12-06-2012
if current_name string has space in it, you will see the difference.
Last edited by rdcwayx; 12-06-2012 at 11:06 PM..
This User Gave Thanks to rdcwayx For This Post:
mar85
# 3  
Old 12-06-2012
I've test to set the current_name to a string with spaces in it,
running both A and B produces the same result with no difference.

Wondering why the writer of the script writes out A instead of B, since both produce the same result?
# 4  
Old 12-06-2012
ok, second, if there are two var defined, current_name and current, if no Braces with $Bcurrent_name, you maybe don't get the expect result.
# 5  
Old 12-07-2012
When expanding a shell variable, the braces aren't needed unless the character following the variable name could be interpreted to be part of the name. So: $current_name/$opt produces exactly the same results as ${current_name}/${opt}, but ${current_name}_abc/${opt}_def is not at all the same as $current_name_abc/$opt_def.
This User Gave Thanks to Don Cragun For This Post:
mar85
# 6  
Old 12-07-2012
Thanks guys for the help..
Finally understand the reason
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