编写一个shell脚本程序，它带一个命令行参数，这个参数是一个文件。如果这个文件是一个普通文件，则打印文件所有者的名字和最后的修改日期。如果程序带有多个参数，则输出出错信息。
编写shell程序，统计指定目录下的普通文件、子目录及可执行文件的数目，目录的路径名字由参数传入。
用bash编写程序，该程序从键盘输入的n个整数，计算其总和、最大值和最小值并输出，从小到大排序并输出。(Write a shell scr ipt program, which takes a command line parameter, which is a file. If the file is an ordinary file, print the name of the file owner and the last modification date. If the program has multiple parameters, the output error message.
Write shell program, statistics the number of ordinary files, subdirectories and executable files under the specified directory, and the path name of the directory is imported by parameters.
Programming with bash, the program from the keyboard input of N integers, calculate its total, maximum and minimum value and output, from small to large sorting and output.)