iconv all files from GBK to UTF-8

iconv-all.sh

#!/bin/sh

SUFFIX="iconv-all-backup"

function convert()
{
    n_total=0
    n_error=0
    while read f; do
        fb="$f.$SUFFIX"
        mv "$f" "$fb"
        iconv "$@" "$fb" > "$f"
        if [ $? -ne 0 ]; then
            # Failed to convert, rollback
            ((n_error+=1))
            cp "$fb" "$f"
        fi
        ((n_total+=1))
    done

    echo "$n_total files proccessed, $n_error errors occurred."
}

function revert()
{
    while read f; do
        fb="$f.$SUFFIX"
        if [ -e "$fb" ]; then mv "$fb" "$f"; fi
    done

}

function clean()
{
    while read f; do
        rm -f "$f.$SUFFIX"
    done
}

op="$1"
shift
case $op in
    convert)
        convert
        ;;
    revert)
        revert
        ;;
    clean)
        clean
        ;;
    *)
        echo "Usage: $0 {convert|revert|clean} iconv_args"
        ;;
esac