How can I code from the Linux shell? I have a package of CSV files in ANSI and I want to convert to an encoding that doesn't have accents: ã, ç, á, í ...
How can I do it without involving any programming language?
Assuming you're using the GNU version of iconv(1) (Since you have this tagged linux it seems a safe bet):
iconv -f MS-ANSI -t US-ASCII//TRANSLIT input.csv > output.csv
(I'm guessing on the MS-ANSI from encoding; iconv --list | grep -Fi ANSI shows several other possibilities. Or your source character set could be something completely different.)