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  1. #!/bin/bash
  2.  
  3. subsequences () {
  4.     local array=("$@")
  5.     local this=${array[0]}
  6.     local tail
  7.     echo "$this"
  8.     [ "${#array[@]}" -eq 1 ] && return
  9.     subsequences "${array[@]:1}" |
  10.     while IFS='' read -r tail; do
  11.         printf '%s && %s\n' "$this" "$tail"
  12.         echo "$tail"
  13.     done
  14. }
  15.  
  16. subsequences fire water air
  17.  
  18. # Works with spaces too
  19. subsequences "one two" "three four"
  20.  
Success #stdin #stdout 0.01s 5304KB
comments (?)
stdin 
Standard input is empty
stdout 
fire
fire && water
water
fire && water && air
water && air
fire && air
air
one two
one two && three four
three four
https://ideone.com/jfBwTr
https://stackoverflow.com/questions/77889920/how-to-use-variable-from-previous-function-iteration-in-bash-script
language:
Bash (bash 5.0.3)
created:
112 days ago
visibility:
secret

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