Simple histogram

hist.sh

hist() {                                                                        
    local sortopts1= sortopts2=                                                 
    while [[ $# != 0 && "$1" == -* ]]; do                                       
        if [ "$1" = -r ]; then                                                  
            sortopts2=-r                                                        
        elif [ "$1" = -n ]; then                                                
            sortopts1=-n                                                        
        elif [[ "$1" = -rn || "$1" = -nr ]]; then                               
            sortopts1=-n sortopts2=-r                                           
        else                                                                    
            echo "Usage: hist [-nr] [infile ...]" >&2                            
            return 1                                                            
        fi                                                                      
        shift                                                                   
    done                                                                        
    if [ $# = 0 ]; then                                                         
        sort $sortopts1 | uniq -c | sort -n $sortopts2                          
        return $?                                                               
    else                                                                        
        cat "$@" | sort $sortopts1 | uniq -c | sort -n $sortopts2               
        return $?                                                               
    fi                                                                          
}