Unix command to remove space from a file name

Question

I have a file whose file name has a space like First Name_20180810.csv. The date (20180810 in the above example) changes daily in the filename. How can I rename First Name_*.csv to be FirstName_*.csv?

Answer 1

If you do not have access to the rename tool, this should work:

for file in *.csv; do
    if ! [[ -f "${file// /}" ]]; then
        mv "$file" "${file// /}"
    else
        echo "Replacement for '${file}' already exists; skipping"
    fi
done

Answer 2

Use rename command:

rename "s/ //g" *.csv

man rename :examples