books for linux shell scripting and python?

[JQL]

Can you guys recommend a good introductory book for shell scripting, and maybe python? I'm going to have to learn it better.

e.g. what does the % mean here?

for f in *.fasta.gz
do
metaphlan2.py $f --input_type fasta --nproc 4 > ${f%.fasta.gz}_profile.txt
done

thanks
John

[GenoMax]

$ ls *.fastq.gz
P1.fastq.gz  P2.fastq.gz  Pdot1.fastq.gz  Pdot2.fastq.gz

Compare the list above to the output below. Can you see what f% is doing?

$ for f in *.fastq.gz; do echo ${f%.fastq.gz}; done

P1
P2
Pdot1
Pdot2

[JQL]

Thanks!

I have all the fastq files in the dir of /fastq. but I don't need /fastq, only need P1, P2...
Is there an easy way to pick up what the * stands for?

John

for f in fastq/*.fastq.gz; do echo ${f%.fastq.gz}; done

$ ls *.fastq.gz
P1.fastq.gz  P2.fastq.gz  Pdot1.fastq.gz  Pdot2.fastq.gz

Compare the list above to the output below. Can you see what f% is doing?

$ for f in *.fastq.gz; do echo ${f%.fastq.gz}; done

P1
P2
Pdot1
Pdot2