请大家帮忙看道题,谢谢!

biaog

Write a shell script (to run on the Bourne shell) that takes a file name as argument and then compresses and decompresses the file with each of the following programs:

compress                gzip                zip

For each of the compressing programs, the script notes the size of the file before and after compression. Then, the script displays a table showing the compression program, uncompressed size, compressed size, and compression ratio (up to one place of decimal). The table should be ordered by the compression achieved, with figures for the most efficient compression featuring at the top. Before using a compressing program to manipulate the file, your script must verify that the file actually exists under the current directory and is readable.

You would probably need to research these UNIX commands: set, awk, sort.

Your script for this task must be named compr.sh. Make sure your script is user-friendly and follows common sense. Here is a sample output (The $ is the shell prompt, and ff is the file name):

$ compr.sh ff
File: ff
gzip                17375        5550                68.1
zip                17375        5665                67.4
compress                        17375        7641                56.0

forestlin

没什么难度吧
就是 ls -l|awk，还有bc
最后echo出来就可以

4Aiur

怎么让bc 五进十 ?

forestlin

对不起，bc不行，HP上用bs