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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asa(1)							      General Commands Manual							    asa(1)

NAME
asa - Interprets carriage-control characters SYNOPSIS
asa [file...] STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: asa: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None OPERANDS
The pathname of a file to be read. If this parameter is omitted, standard input is read. DESCRIPTION
The asa command writes its input files to standard output, mapping carriage-control characters from the text files to line-printer control sequences. The first character of every input line is removed and, depending on the character removed, an action performed on that character and the rest of the line. If the character removed is: The rest of the line is output without change. A newline character is output, followed by the rest of the input line. A form-feed character is output, followed by the rest of the input line. The newline character of the previ- ous line is replaced with a carriage-return character, which is output, followed by the rest of the input line. If + is the first character in the input, + has the same effect as the space character. [Tru64 UNIX] The character is output, followed by the rest of the input line. EXIT STATUS
The following exit values are returned: Successful completion. An error occurred. EXAMPLES
To view a file (created by a program using FORTRAN-style carriage control characters) on a terminal: asa file To format the FORTRAN output of a.out and direct it to the printer: a.out | asa | lp ENVIRONMENT VARIABLES
The following environment variables affect the execution of asa: Provides a default value for the internationalization variables that are unset or null. If LANG is unset or null, the corresponding value from the default locale is used. If any of the internationalization vari- ables contain an invalid setting, the utility behaves as if none of the variables had been defined. If set to a non-empty string value, overrides the values of all the other internationalization variables. Determines the locale for the interpretation of sequences of bytes of text data as characters (for example, single-byte as opposed to multi-byte characters in arguments and input files). Determines the locale for the format and contents of diagnostic messages written to standard error. Determines the location of message catalogues for the processing of LC_MESSAGES. SEE ALSO
Commands: lp(1) Standards: standards(5) asa(1)