Hello professor, I've doubt about searching file into the system. as you mention in the assignment that, user will pass "tobacco_nation <csv data file> < year | country code > < Male | Female >" so, can i assume that whenever user pass the file name, user always provide the full path where file is located. for example : 1. tobacco_nation "WHO_tobacco_control_tonly.csv" 2000 Male or 2. tobacco_nation "~/stud/perm/WHO_tobacco_control_tonly.csv" 2000 Male Currently i'm assuming 1st scenario. that's why i used find command to search file in whole system.