Could someone break down this unexpected behavior: #!/bin/bash

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Could someone break down this unexpected behavior:

#!/bin/bash
IP=$(echo $SSH_CLIENT | awk '/ /{print $1}')
echo $IP
echo $SSH_CLIENT

run as root produces correct entries;
run as regular user produces blank entries;
run straight in a shell - echo $SSH_CLIENT | awk '/ /{print $1}' - produces correct entries;