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I am submitting a slurm job to iterate through 6 samples and do a function 'cellranger count' on them. My job file looks like this:

#!/bin/bash 
####other sbatch options
...
#SBATCH --array=1-6                                                                                                                                                                          
echo "### Starting at: $(date) ###"

sample=$(head -n $SLURM_ARRAY_TASK_ID ~/data/samples_nh.csv | tail -n 1)
cellranger count \
        --id=${sample} \
        --fastqs=~/data/raw_fastqs \
        --sample=${sample} \
        --transcriptome=~/data/refdata-gex-GRCh38-2020-A \
        --localcores=${SLURM_CPUS_PER_TASK} 
        #... other options
echo "### Ending at: $(date) ###"

the samples_nh.csv consists of 6 rows and 1 column with sample names like MU100, MU150, etc., no header

I get this error:

error: Invalid value for '--id ': must contain only letters, digits, underscores, and dashes

except for the last array, where it gives me the error connected with another option, so I guess --id passes it.

when I check the head -n $SLURM_ARRAY_TASK_ID ~/data/samples_nh.csv | tail -n 1 with numbers from 1 to 6, the first 5 commands give me my sample names on a separate row each, the $SLURM_ARRAY_TASK_ID=6 gives the last sample number with no new line in the end. It looks like this:

[xxx@xxxxxx data]$ head -n 6 ~/data/samples_nh.csv | tail -n 1
MU384[xxx@xxxxxx data]$

So maybe the issue is in a 'newline' character in the end? Does anyone know how to fix this?

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