#!/bin/busybox sh
if [[ $1 == https:* ]]
then
  echo "Using URL $1"
fi

#!/bin/busybox sh
case "$1" in
  https:*)
    echo "Using URL $1" 
    ;;
esac

You are using [[ .. ]] in BusyBox sh to match against a glob pattern. This is supported in Bash and Ksh, but not in BusyBox.

Rewrite the match to use a case statement instead.

None.

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