how to split string at shell code example

Example 1: split bash string

IN="[email protected];[email protected]"
arrIN=(${IN//;/ })

Example 2: split string using linux cmd

$ s='one_two_three_four_five'

$ A="$(cut -d'_' -f2 <<<"$s")"
$ echo "$A"
two

$ B="$(cut -d'_' -f4 <<<"$s")"
$ echo "$B"
four