tcl - Why does "exec" gives "child exited abnormally" in this code? -


i running code in tcl:-

set version [exec grep "internal version:" mojave.log | sed -n -e "s/internal version: //g" > xor.diff]  set p [exec diff ../log.warning.diff ../log.warning.gold >> xor.diff ]

for last line gives following error after doing diff:- 

> rule-311 warning: gdsii layer number 85 datatype 0 has been defined > tcl-11   warning: command "check quartz drc" overridden, quality of > tcl-11   warning: command "delete marker quartz" overridden, quality of > tcl-11   warning: command "import marker quartz" overridden, quality of > tcl-11   warning: command "mojave! run filter log" overridden, quality of > tcl-11   warning: command "run quartz gui" overridden, quality of results > tcl-11   warning: command "ui! mojave draw rectangle" overridden, quality > tcl-11   warning: command "ui! mojave set_context" overridden, quality of > tcl-12   warning: overridden command "mojave! run filter log" used, child process exited abnormally      while executing "exec diff ../log.warning.diff ../log.warning.gold 2> xor.diff "      invoked within "set p [exec diff ../log.warning.diff ../log.warning.gold 2> xor.diff ]"      (file "test.tcl" line 4)      invoked within "source test.tcl"

and not writing in "xor.diff" file.

exec returns error if command returns non-zero or if sends stderr. there's thorough discussion of using catch exec @ http://wiki.tcl.tk/exec


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