[Q] Writnig a .sh script cant get var to dd command - Android Q&A, Help & Troubleshooting

The main objective is to send a splited file to an android and join it back up with a .sh script, the file is splited to 5MB parts but its total size is unknown (trying to make an universal script), I've splited the file and transferred the file parts and the script to a dir inside the android device and ran the .sh with adb shell sh script.sh. every thing is is ok but the dd command which wont accept a variable
Code:
file="$(ls /data/local/tmp/ | grep -i --include="*.tul" tul)"
echo file is "$file"
name="${file%.*}"
echo short name is "$name"
tmp="${file: -3}";
num=${tmp//[!0-9]/}
echo number of files is "$num"
N="${name}.part1"
i=1
while [ $i -le $num ]; do
dd if="/data/local/tmp/$"${name}.part""$i"" of="/data/local/tmp/cust" bs=1024 count=5120 seek="$((($i-1)*5120))"
let i=i+1
done
echo DONE
exit
the output normally is that the end of the name cuts the beginning and I get dd if No such file or directory meaning
Code:
/data/local/new_file.part1
becomes something like
Code:
.part1local/new_file
while in command lind adb shell it works OK
adb shell
Code:
adb shell
>dd if="/data/local/tmp/$"${name}.part1"" of=/data/local/tmp/cust bs=1024 count=5120
$file is an index file that has the parts name and total number of them generated by the split code (in java) Important to say that Im a total noob and it took me few hours to get to this so any help is appreciated
edit:
Code:
dd if=/data/local/tmp/"$name".part"$i" of=/data/local/tmp/cust bs=1024 count=5120 seek="$((($i-1)*5120))"
working in command line (adb shell) but when running the .sh file I get
Code:
.part2: No such file or directory

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Bump, can any one help ?