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  1. # foo
  2. # bar
  3. : {fd}< $0
  4. read <&$fd x
  5. echo "$?; $x"
  6. exec {fd}<&-
  7. # a failed read doesn't modify REPLY, so
  8. # use different vars to be less confusing
  9. read <&$fd y
  10. echo "$?; $y"
  11.  
Success #stdin #stdout #stderr 0.01s 5276KB
comments (?)
stdin 
Standard input is empty
stdout 
0; # foo
1;
stderr 
./prog.sh: line 9: $fd: Bad file descriptor
https://ideone.com/N1fpFw
language:
Bash (bash 5.0.3)
created:
5 hours ago
visibility:
secret

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