i have 100 filenames (text files) in a folder as below

GCA_000696115.1_SoWt_assembly_genomic.fna

GCA_000985875.1_NgalHAMBI1146Draft_genomic.fna

GCA_003990705.1_ASM399070v1_genomic.fna

for file in *; do mv “$file” “${file::15}”.txt ; done – get first 15 characters from all files

output

GCA_000696115.1

GCA_000985875.1

GCA_003990705.1

Expecting : But I want to delete the characters from specific position (from 15 characters onwards, i.e., _SoWt_assembly_genomic.fna

Thank you in advance