Bash script sudo and variables [duplicate] - bash

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Bash foreach loop works differently when executed from .sh file [duplicate]
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Closed 4 years ago.
Totally new to Bash here, actually I've avoided it like a plague for 10 years.
Today, there is no way around it.
After a few hours of beating my head against the keyboard, I discovered that sudo and any bash variable in a command gets stripped out.
So I have something like
somescript.sh
for i in {1..5}
do
filename=somefilenumber"$i".txt
echo $filename
done
on the command line now if I run it
user#deb:~$ ./somescript.sh
I get the expected
somefilenumber1.txt
somefilenumber2.txt
somefilenumber3.txt
somefilenumber4.txt
somefilenumber5.txt
but if I run with sudo, like
user#deb:~$ sudo ./somescript.sh
I'll get this
somefilenumber{1..5}.txt
This is a huge problem because I'm trying to cp files and rm files in a loop with the variable.
So here is the code with cp and rm
for i in {1..10}
do
filename=somefilenumber"$i".txt
echo $filename
cp "$filename" "someotherfilename.txt"
rm "$filename"
done
I end up getting
cp: cannot stat 'somefilenumber{1..5}.txt': No such file or directory
rm: cannot remove 'somefilenumber{1..5}.txt': No such file or directory
I need to run sudo also because of other programs that require it.
Is there any way around this?
Even if nothing else require sudo, and I don't use it, the rm command will prompt me for every file if I'm sure that I want to remove it or not. The whole point is to not be sitting here tied to the computer while it runs through hundreds of files.

Answer 1

You could try to replace {1..10} with seq 1 10:
for i in `seq 1 10`
do
filename=somefilenumber"$i".txt
echo $filename
cp "$filename" "someotherfilename.txt"
rm "$filename"
done
Your problem sounds like the environment has something wrong for root, do you start the script with:
#!/bin/bash
?