Randomly appearing control characters in text files


 
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Operating Systems AIX Randomly appearing control characters in text files
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Old 07-18-2006
Randomly appearing control characters in text files

Hi,

From some time, we have noticed that our ascii files have started corrupting due to the presence of some random control characters (^@, ^M, ^H, ^D). The characters appear randomly on any file after the process that creates the file finishes. If we rerun the process, the files re creates perfectly without problems.

The appear on any file randomly. Their location in the file is also random. We tried a reboot of the server (AIX 5. something), but the problem still persists. We found some bad blocks on disk during reboot and then we did a restore from backup.

The problem still persists.

Thanks
Aakash
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randtype(1)						      General Commands Manual						       randtype(1)

NAME
randtype - Output characters or lines at random intervals SYNOPSIS
randtype [ -l ] [ -d ,|.<string> [ -k ] ] [ -t <ms,mult> ] [ -w <string> [ -c ms,mult ] ] [ -r s1,s2[:...] ] [ -n <string> ] [ -q <int> ] [ -m <int> ] [ file ... ] DESCRIPTION
randtype reads input from either standard input or from a file and outputs each character or line at random intervals. If multiple files are specified, each is read in sequence. OPTIONS
randtype recognizes the following command line options: -c ms,mult For optional use with the -w option, this has the same microsecond and multiplier value format as the -t option. The default for this option is specified at compile time. -d string Output everything before (left) or after (right) the specified string immediately. The string must begin with either ',' or '.' which specifies the direction, left or right, respectively. -h Print a summary of the command line options and exit. -k Suppress output of the string specified by the dump string option. -l Output lines rather than characters. Only the -t and -q options are valid when using this option, all other options are ignored. -m int Generate random mistakes. The int value is how many times to compare and match the next character and a randomly generated charac- ter. -n chars Output the specified characters immediately with no random waiting. -r s1,s2[:...] Replace the string s1 with string s2. You can specify multiple replacements by separating them with a ':'. -q int Quit the program after this many seconds. -t ms,mult This option refines the random delay of output. The value of the argument is separated by a comma with the first argument being a microsecond and the second being a multiplier of a random number between 0 and the microsecond. A character-per-second effect can, for example, be made by setting the microsecond to 0 and the multiplier to 1000000. The default for this option is specified at com- pile time. -v Display version information and exit. -w chars The inverse of the -n option; this option waits on the specified characters. Use the -c option to refine the random delay of output. EXAMPLE
randtype -t 13,16000 -d ",*MAGIC*" -k -n '0ou' filename SEE ALSO
random(3), srandom(3), alarm(2), select(2) AUTHOR
This program was created by bjk <bjk@arbornet.org> and released under the terms of the GNU General Public License version 2 or later. randtype randtype(1)