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Full Discussion: How to check a file exist and do a copy of other files
Top Forums Shell Programming and Scripting How to check a file exist and do a copy of other files Post 302152450 by Smiling Dragon on Wednesday 19th of December 2007 09:39:42 PM
Old 12-19-2007
It's easier to read if you use 'CODE' tages around code:
Quote:
Originally Posted by ahjiefreak
But if i would like to add in a third field with 0 of the intended copied file; how could I do so without creating another files.

Means :-

in MM folder I have A.txt(size which is 0) and in NN folder I have similar A.txt (size more than 0)
Code:
if [-s MM/A.txt] then

else cat NN/A.txt <perform the addition of all 0s in third field of A.txt> 
copy MM/A.txt to NN/A.txt

I would like to perform the substitution if the size is 0 before copied to the new path.
Last edited by ahjiefreak : 3 Minutes Ago at 03:31 PM.
So NN/A.txt contains some 0's in the third field, and you want to add then up? <confused>
Or do you want to add them to MM/A.txt? Even though it's currently blank? <still confused>

Please show an example of what you are trying to do.

Also, consider using [ ! -s ] so you don't need the 'else' section in your code.
 

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LEARN ABOUT DEBIAN

h5jam

h5jam(1)						      General Commands Manual							  h5jam(1)

NAME

       h5jam - Add a user block to a HDF5 file

SYNOPSIS

       h5jam -u user_block -i in_file.h5 [-o out_file.h5] [--clobber]

DESCRIPTION

       h5jam  concatenates  a  user_block  file  and an HDF5 file to create an HDF5 file with a user block. The user block can be either binary or
       text. The output file is padded so that the HDF5 header begins on byte 512, 1024, etc.. (See the HDF5 File Format.)

       If out_file.h5 is given, a new file is created with the user_block followed by the contents of in_file.h5.   In	this  case,  infile.h5	is
       unchanged.

       If out_file.h5 is not specified, the user_block is added to in_file.h5.

       If  in_file.h5  already	has  a	user  block,  the contents of user_block will be added to the end of the existing user block, and the file
       shifted to the next boundary. If --clobber is set, any existing user block will be overwritten.

EXAMPLE USAGE

       Create new file, newfile.h5, with the text in file mytext.txt as the user block for the HDF5 file file.h5.

	    h5jam -u mytext.txt -i file.h5 -o newfile.h5

       Add text in file mytext.txt to front of HDF5 dataset, file.h5.

	    h5jam -u mytext.txt -i file.h5

       Overwrite the user block (if any) in file.h5 with the contents of mytext.txt.

	    h5jam -u mytext.txt -i file.h5 --clobber

RETURN VALUE

       h5jam returns the size of the output file, or -1 if an error occurs.

CAVEATS

       This tool copies all the data (sequentially) in the file(s) to new offsets. For a large file, this copy will take a long time.

       The most efficient way to create a user block is to create the file with a user block (see H5Pset_user_block), and  write  the  user  block
       data into that space from a program.

       The  user block is completely opaque to the HDF5 library and to the h5jam and h5unjam tools.  The user block is simply read or written as a
       string of bytes, which could be text or any kind of binary data.  It is up to the user to know what the contents of the	user  block  means
       and how to process it.

       When the user block is extracted, all the data is written to the output, including any padding or unwritten data.

       This tool moves the HDF5 file through byte copies, i.e., it does not read or interpret the HDF5 objects.

SEE ALSO

       h5dump(1), h5ls(1), h5diff(1), h5import(1), gif2h5(1), h52gif(1), h5perf(1), h5unjam(1).

																	  h5jam(1)
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