If condition to check one file newer than the other - first file name uncertain
Dear All,
I'm new to unix scripting. I'm trying to write an utility script which has to check if one file is newer than another one. The condition is I dont know the full name of the first file. I searched google and this forum for any such examples, but couldn't find any or may be I would have missed it.
I wrote this simple check using if, but it is not working.
If i give a definite file name, it prints "file found", but when I use an *, even if the file is present it says "file not found"
I will have to use the wildcard charcater * bcoz each time the text following "xyz" is different.
Could anyone please tell me how to fix this.
Your help is much appreciated.
Thanks
Last edited by Yogesh Sawant; 07-10-2009 at 04:27 AM..
Reason: added code tags
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Dear All,
I'm new to unix scripting. I'm trying to write an utility script which has to check if one file is newer than another one. $3 $4 $5 $6 are files .txt. Help me please.
for i in $3 $4 $5 $6
do
if
then
echo "$1 is newer than $i"
else
echo "$i is newer than $1"
fi (9 Replies)
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Discussion started by: drew77
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LEARN ABOUT SUSE
pfsoutexr
pfsoutexr(1) General Commands Manual pfsoutexr(1)NAME
pfsoutexr - Write images or frames in OpenEXR format
SYNOPSIS
pfsoutexr [--compression <method>] [--keep-xyz] (<file> [--frames <range>]) [<file>...]
DESCRIPTION
Use this command to write frames in OpenEXR format. Source pfs frames should be piped to the Standard Input. This command can write arbi-
trary channels to OpenEXR, color channels XYZ however are specially handled (see option keep-xyz).
All tags from pfs stream are stored in an OpenEXR file as String attributes. Tags assigned to channels are stored in the format <chan-
nel_name>:<tag_name>, so that pfsinexr can later restore tags in the appropriate channels.
The depth channel DEPTH is renamed to Z to keep compatibility with pfsinexr. If the luminance is absolute (tag LUMINANCE set to ABSOLUTE),
WhiteLuminance attribute in OpenEXR file is set to 1.
Details on the format of the pattern file names, which are used for saving multiple frames, can be found in the manual page of pfsoutppm.
--compression <method>, -c <method>
Use one the the available compression methods:
NO - no compression
RLE - run length encoding
ZIPS - zlib compression, one scan line at a time
ZIP - zlib compression, in blocks of 16 scan lines
PIZ - piz-based wavelet compression (default)
PXR24 - lossy 24-bit float compression
--keep-xyz
By default, color channels XYZ from pfs stream are converted to RGB color space and HALF format, which is a standard format for
color data in OpenEXR. Since Half format is 16-bit and floating points values used in pfs stream are 32-bit, this conversion causes
loss of precision. When keep-xyz option is specified, color channels XYZ are stored as they are without any conversion (32-bit float
XYZ channels). Note however, that most OpenEXR applications can recognize only RGB Half format images and can not handle 32-bit XYZ.
--fix-halfmax
The maximum value that can be stored in OpenEXR file is limited to 65504 if 16-bit HALF float is used (color channels are stored by
default in this format unless --keep-xyz switch is specified). If the luminance data is calibrated in absolute values (cd/m^2),
pixel values can easily exceed 65504. To avoid clamping large pixel values, pfsoutexr can rescale data to the range that is valid
for 16-bit HALF float format when --fix-halfmax switch is specified. If this switch is missing, a warning message is displayed.
Scale factor used for rescaling is stored in OpenEXR file as OpenEXR standard attribute WhiteLuminance, so that pfsinexr can later
restore the absolute values.
EXAMPLES
pfsin memorial.hdr | pfsoutexr memorial.exr
Converts from one HDR format to another
SEE ALSO pfsout(1)pfsoutppm(1)pfsinexr(1)BUGS
pfsinexr and pfsoutexr can not take stdin / stdout as an input/output (dash '-' instead of file name).
Please report bugs and comments on implementation to the discussion group http://groups.google.com/group/pfstools
pfsoutexr(1)