Bowtie and samtools questions

[dicty]

I'm new in sequencing analysis and have a couple of questions to ask.

1. I’m trying to use bowtie-inspect to reconstruct fasta file from the BOWTIE index, but couldn’t get anything. I’m using 12.7 version.

Here is the command:
./bowtie-inspect e_coli

Then I got the following output, but nothing else:
Command: ./bowtie-inspect e_coli

Why I cannot run bowtie-inspect? Is there anything wrong?

2. I installed samtools and try to produce a .fai file with "samtools faidx", but I got the following errors.

./samtools: No such file or directory
or
samtools: command not found

How do I run samtools? Is there anything wrong I did?

Thanks a lot!