adding curl parameter via environment variable

apt-offline2bat.sh

@@ -34,16 +34,16 @@ do
 
 	if [ "$fsfile" = "InRelease" ]
 	then
-		echo curl -f $fsrc2 -o $fdest1 >> $OUTFILE
-		echo curl -f $fsurl/Release -o $fdurl\_Release >> $OUTFILE
-		echo curl -f $fsurl/Release.gpg -o $fdurl\_Release.gpg >> $OUTFILE
+		echo curl %CURL_PARAM% -f $fsrc2 -o $fdest1 >> $OUTFILE
+		echo curl %CURL_PARAM% -f $fsurl/Release -o $fdurl\_Release >> $OUTFILE
+		echo curl %CURL_PARAM% -f $fsurl/Release.gpg -o $fdurl\_Release.gpg >> $OUTFILE
 	elif [ "$fdend" = "$fsend" ]
 	then
-		echo curl -f $fsrc2 -o $fdest1 >> $OUTFILE
+		echo curl %CURL_PARAM% -f $fsrc2 -o $fdest1 >> $OUTFILE
 	else
-		echo curl -f $fsrc2 -o $fdest1.$fsend >> $OUTFILE
-		echo curl -f $fss.bz2 -o $fdest1.bz2  >> $OUTFILE
-		echo curl -f $fss.xz -o $fdest1.xz >> $OUTFILE
+		echo curl %CURL_PARAM% -f $fsrc2 -o $fdest1.$fsend >> $OUTFILE
+		echo curl %CURL_PARAM% -f $fss.bz2 -o $fdest1.bz2  >> $OUTFILE
+		echo curl %CURL_PARAM% -f $fss.xz -o $fdest1.xz >> $OUTFILE
 	fi
 done < "$INFILE"