Bash: trim affixes from variable values

${variable%pattern} Trim the shortest match from the end ${variable##pattern} Trim the longest match from the beginning ${variable%%pattern} Trim the longest match from the end ${variable#pattern} Trim the shortest match from the beginning

$ s="basics-01-understanding-the-course-project-starting-code.zip"
$ echo ${s%.zip}
basics-01-understanding-the-course-project-starting-code
$ mkdir ${s%.zip}
$ unset s

https://tldp.org/LDP/LG/issue18/bash.html