# Prepare array
A=; for i in a b c d; do A="$A$i:"; done; echo $A;

# Iterate over
while [ -n "${A}" ]; do I="${A%%:*}"; echo "${I}"; A="${A#*:}"; done

# Prepare array
A=; for i in a b c d; do A="$A$i:"; done; echo $A;

# Iterate over
while [ -n "${A#:*}" ]; do I="${A%%:*}"; echo "${I}"; A="${A#*:}"; done

A="a:b:c"; CDR="${A}:"; while [ -n "${CDR}" ]; do CAR="${CDR%%:*}"; CDR="${CDR#*:}"; echo "${CAR}"; done

Arrays in POSIX Shell

Arrays in POSIX Shell

Bash