shell - Bash: Append to list with variable name -


the first 3 commands work fourth not. how can append array variable in name?

i=4 eval pim$i= pim4+=(`date`)  pim$i+=(`date`)

thanks!

with bash 4.3, there's feature targeted @ use case: namerefs, accessed declare -n. (if have modern ksh, they're available using nameref built-in)

declare -n pim_cur="pim$i" pim_cur+=( "$(date)" )

with bash 4.2, can use printf -v assign array elements:

array_len=${#pim4[@]} printf -v "pim4[$array_len]" %s "$(date)"

prior bash 4.2, may need use eval; can made safe using printf %q preprocess data:

printf -v safe_date '%q' "$(date)" eval "pim$i+=( $safe_date )" # safe if can guarantee $i contain                              # characters valid inside variable name (such                              # numbers)

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