Perfect. thank you.

Q1: Basename = the source name right?
Q2: Could you explain the ( meaning )compilation of "file" in these commands ?

for file in $JPG
zip -u -m /home/sok/Receive/$base.zip $file

Is file means the variable value of the source?

A1: "basename" command returns the name of file/directory after stripping the suffix/extension. So if I run basename command on a file named 1.jpg as "basename 1.jpg .jpg" then it'll return 1. Do man basename for details.

A2: in the script "file", "base", and "JPG" are variables which store respectively the name of the jpg file with extension, name of the jpg file w/o extension and list of jpg files. $ denotes a variable.

means it'll look for any file whose name matches with the list in $JPG
means it'll extract the name stripping the extension and store it to base
means it'll create zip from the source file ($file) and store it in destination ($base.zip)

For more explanation, read any bash scripting guides like this: http://tldp.org/LDP/abs/html/

Also, if your problem is solved, mark the thread as solved.

HTH,

1 members found this post helpful.

someshpr

You are right, sir.
I changed my code. It's true no need to compress a JEPG image.

I have a question.
I repleced "file" with "image" as the following:
with
But, when using file,it look as the following:

bold and coloured "file ". 1- why ?Is there different, using it instead of using any variable name?
Does it effect on the moving operation?

2- Why the size of the empty folder is 4.k (4096) not zero?

1. I am not sure I understand your first question. Are you worried about the fact that color of the word "file" is same as the word "image" when you open the script in your text editor? If that is the case, no need to worry. Most text editors have a syntax-based coloring scheme and from the extension and preamble of the file they try to determine the type of the file. Based on these, the text editor colors some words differently than others. This has nothing to do with the function. So replacing "file" with "image" or any other name will not change the way the script is supposed to work.

2. As far as I know, each directory, even when they are empty, requires to store some info, such as name, permission, timestamp, etc. It therefore needs some space to store these. The size of the empty directory is the size required to store these. This size varies with file system you are using, and probably 4kb is the smallest block in your file system. So it shows up as a directory of size 4k

HTH,

I worried because "file"&"image" is not the same color.S I think the interpreter will different interact with "file"?! I thought
the colored thing as a defined data type.
I like that analysis and now, I am well-convinced of it. I was thinking in it.And you provide me with extra details, thanks.