#!/bin/sh

declare \
    c1="uname -a" \
    c2="uptime" \
    _i=0 \
    z;

while (( ++_i <= 2 ));
do 
    z=c$_i;
    printf '********************************\ncommand: %s\n%s\n\n' \
            "${!z}" \
            "$( eval ${!z} )";
done;

unset -v c1 c2 _i z;

#!/bin/sh

declare -a _commands;
declare -i _i;
declare    _z;

_commands[1]="uname -a";
_commands[2]="uptime";

for (( _i=1; _i <= 2; _i++ ));
do 
    _z=${_commands[$_i]};
    printf '********************************\ncommand: %s\n%s\n\n' \
            "$_z" \
            "$( eval $_z )"
done;

unset -v _commands _i _z;

#!/bin/sh

declare -a _commands;
declare    _z;

_commands[8]="which cal >/dev/null 2>&1 && cal -3m";
_commands[3]="uptime";

for _z in "${_commands[@]}";
do 
    printf '********************************\ncommand: %s\n%s\n\n' \
            "$_z" \
            "$( eval $_z )"
done;

unset -v _commands _z;