try catch - real-time TCL exec output -


i have following scenario:

if { [catch { exec echo calling big script } exec_msg] } {     puts "nok"     puts "output of big script: $exec_msg" } else {     puts "ok"     puts "output of big script: $exec_msg" }

are there solutions print $exec_msg in real-time, in sync execution of big script?

if do:

exec echo calling big script >@stdout # wrapped around exec same; omit brevity

then output script written straight standard out. however, lose ability read tcl script. read script, can try (on unix):

exec echo calling big script | tee /dev/tty

however tend delay output until accumulates few kilobytes @ time (a feature of how programs output non-terminals). fixing requires use of expect, lot more complicated, or maybe creating pipeline , handling asynchronously. it's substantial step in trickiness you've been doing, , it's because you're starting fight against how programs work naturally. frank, you're better off avoiding sort of thing if don't need it.


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