05-18-2006
Clearing file contents
Hi,
We need to clear the contents of a file. For this we tried using the commands like - '>filename' and 'cat filename > /dev/null'.
If the file size is large, the above commands will clear the file contents but the size of the file remains the same (checked using the command 'ls -l filename').
Are there any other UNIX commands which will empty the file contents?
Regards,
Raghavendra
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LEARN ABOUT OPENDARWIN
segedit
SEGEDIT(1) General Commands Manual SEGEDIT(1)
NAME
segedit - extract and replace sections from object files
SYNOPSIS
segedit [ option ] name ... input_file [-extract segname sectname filename] ... [[-replace segname sectname filename] ... -output out-
put_file]
DESCRIPTION
Segedit extracts and or replaces the named sections from the input_file and creates an output_file (if replacing a section). The segment
and section names are the same as specified to ld(1) with the -segcreate option. The segment and section names of an object file can be
examined with the -l option to otool(1). Only sections in segments that have no relocation to or for them can be replaced (marked with the
SG_NORELOC segment flag) but all sections can be extracted.
The options to segedit(1):
-extract segname sectname filename
Extracts the section specified by the segment name section name pair and places the contents in the specified filename.
-replace segname sectname filename
Will replace the section specified by the segment name section name pair and places and take the new contents for the section from
the specified filename. The -output filename option must also be specified. The resulting size of the section will be rounded to a
multiple of 4 bytes and padded with zero bytes if necessary.
-output output_file
Specifies the output file to create when replacing sections.
SEE ALSO
ld(1), otool(1)
LIMITATIONS
Only mach-O format files that are laid out in a contiguous address space and with their contents ordered in the order of increasing address
can have their segments replaced by this program. This layout is what the link editor produces by default.
Apple Computer, Inc. October 23, 1997 SEGEDIT(1)