Need help in finding filesize , moving file , gzipping file

Hi ,

Please help with the following questions

1) how can i find size of a file ? i have written du -k $flname > s1 . Is this right ?
Any other better suggeastions ?

2) how do I use mv command for moving the file ? I need the syntax with some examples

3) Command for printing the total number of files and folders in the gzipped file .

4) How can I compress a folder using gzip ? when I tried it gave me an error saying gzip can't zip a folder

5) how can I keep the original file after gzipping , as you know gzip usually deletes the original file after gZipping

6) I want to gzip even the fies inside the subfolders of my file , sowhich command should I use ? Will gzip -r $filename do it ?

Thanks for answering .

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