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  1. #!/bin/bash
  2.  
  3. cd $(mktemp -d) # go to a temp dir
  4. mkdir -p 1/2/3/
  5. touch 1/1.txt 1/2/2.txt 1/2/3/3.txt
  6.  
  7. shopt -s globstar
  8. ls **/*.txt
Success #stdin #stdout 0.01s 5392KB
stdin
Standard input is empty
stdout
1/1.txt
1/2/2.txt
1/2/3/3.txt