Hi everyone, I need some helps about prefetch and fasts-dump. I downloaded sratoolkit and un-tar the file. But ı couldn't use it. ım trying but it's giving error like that,

(base) Sehribans-MacBook-Air:~ sehriban$ prefetch SRR1951777 && fastq-dump SRR1951777

2022-12-10T11:58:25 prefetch.3.0.0: 'SRR1951777' is a local non-kart file 2022-12-10T11:58:56 fastq-dump.3.0.0 err: item not found while constructing within virtual database module - the path 'SRR1951777' cannot be opened as database or table fastq-dump quit with error code 3

this error come along with Mac terminal, also ım using linux its also giving different error.

-bash-4.2$ prefetch SRR1951777 && fastq-dump SRR1951777 -bash: prefetch: command not found This linux error, ı know ı have it on linux but it does seems not.

ıf anyone could help me ı will be thankful. thanks a lot.