Rename file in Linux removing some strings

Question

I have a lot of files with this format:

• download_agrupocqa_127_1656097965.tar.gz
• download_bjxkwris_127_1656097966.tar.gz
• download_climpieza_127_1656097965.tar.gz
• download_dhermagqu_127_1656097966.tar.gz

Do you know some command to rename all files in a folder to this format?

• agrupocqa.tar.gz
• bjxkwris.tar.gz
• climpieza.tar.gz
• dhermagqu.tar.gz

Which means remove: download_ and _127_1656097965

Answer 1

In BASH:

for file in *.tar.gz ; do 
    suffix="${file#download_}"      # this removes download_
    prefix="${suffix%%_*.tar.gz}"   # this removes everything after underscore
    mv "$file" "${prefix}.tar.gz"   # this renames the file
done

If you have sed:

for file in *.tar.gz ; do 
    newname=$(echo "$file" | sed 's/download_\([^_]*\)_[0-9_]*\..*/\1.tar.gz/')
    mv "$file" "$newname"
done