system_genetics/rnaseq/step2_trim/snippet.sh

## this script is to generate jobs of trimming for each samples on the cluster
## please run this script first and then submit the jobs for each samples
## reference: http://www.usadellab.org/cms/?page=trimmomatic

#!/bin/bash
# $1 indicates the path of raw samples. 
# In the input folder, one sample has one independent folder with two pair-end f
astq files. 
# The folder name should be the sample name. 
# the fastq file should be sample_1.fastq and sample_2.fastq 
# please prepare a sample.list that include file names for each sample

out="/ * your output folder * /"
input="/ * your input folder * /"
cat sample.list | while read line

do
sample=$(echo $line)
echo '#!/bin/bash'  > rnaseq.${sample}.sh
echo "#SBATCH --job-name=RNAseq.${sample}" >> rnaseq.${sample}.sh
echo "#SBATCH --error=RNAseq.${sample}.err" >> rnaseq.${sample}.sh
echo "#SBATCH --output=RNAseq.${sample}.out" >> rnaseq.${sample}.sh
echo "#SBATCH --mem=15gb" >> rnaseq.${sample}.sh
echo "#SBATCH --time=6:00:00" >> rnaseq.${sample}.sh
echo "#SBATCH --cpus-per-task=6" >> rnaseq.${sample}.sh

echo "ml Java" >>rnaseq.${sample}.sh

echo "java -jar /* your folder of software */trimmomatic-0.36.jar PE \
  -phred33 /$input/${sample}\_1.fq.gz /$input/${sample}\_2.fq.gz \
   $out/trimmomatic/${sample}\_1_paired.fq $out/trimmomatic/${sample}\_1_unpaired.fq \
   $out/trimmomatic/${sample}\_2_paired.fq $out/trimmomatic/${sample}\_2_unpaired.fq \
   ILLUMINACLIP: TruSeq3-PE.fa:2:30:10 \
   LEADING:3 TRAILING:3 SLIDINGWINDOW:4:25 HEADCROP:8 MINLEN:50" >> rnaseq.${sample}.sh

done