[SOLVED] How can I concatenate string in loop in linux bash?

Issue

I am new on coding in bash Linux and I have the following problem.

I'm trying to concatenate string in loop to create a path. I have a text file in which I stored some strings to use in the loop. I wrote this example just to show you the problem:

for bio in `cat /data/giordano/species_ranges/prova_bio.txt` # list of strings: "bio_01", "bio_02"...
do
echo  /data/giordano/species_range/$bio.tif # concatenation
done

The result I expect would be:

/data/giordano/species_range/bio_01.tif
/data/giordano/species_range/bio_02.tif
/data/giordano/species_range/bio_03.tif

But what actually came out was:

.tifa/giordano/species_range/bio_01
.tifa/giordano/species_range/bio_02
.tifa/giordano/species_range/bio_03
/data/giordano/species_range/bio_04.tif

I really don't understand what kind of problem it is...

Solution

You probably have Windows line endings in your file, which contain an additional carriage return (\r). This makes the cursor go to the beginning of the line. You can remove the \rs from your file by piping to tr. Extend your first line like this:

for bio in `cat /data/giordano/species_ranges/prova_bio.txt | tr -d '\r'`

Answered By - carlfriedrich

Answer Checked By - Marilyn (WPSolving Volunteer)