Linux Shell Script For Each File in a Directory Grab the filename and execute a program

Question

Scenario :

A folder in Linux system. I want to loop through every .xls file in a folder.

This folder typically consists of various folders, various filetypes

Answer 1

for i in *.xls ; do 
  [[ -f "$i" ]] || continue
  xls2csv "$i" "${i%.xls}.csv"
done

The first line in the do checks if the "matching" file really exists, because in case nothing matches in your for, the do will be executed with "*.xls" as $i. This could be horrible for your xls2csv.