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unset f ; f=abcd
first_char=${f[@]:0:1}
recho $first_char
first_char=${f[0]:0:1}
recho $first_char
first_char=${f:0:1}
recho $first_char
first_char="${f[@]:0:1}"
recho $first_char
first_char="${f[@]:0:1}"
recho $first_char
first_char="${f[0]:0:1}"
recho $first_char
first_char="${f:0:1}"
recho $first_char
unset f;
f=( one two three )
first_word=${f[@]:0:1}
recho $first_word
first_word=${f[0]:0:1}
recho $first_word
first_word=${f:0:1}
recho $first_word
unset f;
f=( one two three )
first_word=${f[@]:0:1}
recho $first_word
set -- abc def ghi
printf '<%s> ' "123 $@ 456"; echo
printf '<%s> ' "123 $@\ 456"; echo
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