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A comment on The roots of an obscure Bourne shell error message. Parent comment

Re:The roots of an obscure Bourne shell error message by 1vuio0pswjnm7 on Tuesday September 12, 2023 @05:08PM (#37488382) 

   Without using printenv or grep -F (in shell script /bin/fgrep)

   $ export FRED=value
   $ set|grep FRED
   FRED='value'
   $ FRED=
   $ set|grep FRED
   FRED=''
   $ unset FRED
   $ set|grep FRED
   $ # ie, no output from set
(Missed a dollar sign.)
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