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DJGPP Utilities Reference

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4. dtou

Usage: dtou [-b] [-h] [-r] [-s] [-t] [-v] [-vv] `files'

Each file specified on the command line is converted from dos's CR/LF text file mode to unix's NL text file mode.

All djgpp wildcards are supported. Timestamps of the files are preserved.

dtou will pass an exit status of 0 to the calling context if all the files have been successfully processed and an exit status greater than 0 if not. In this case, the exit status is equal to the amount of unsuccessfully processed files. A file has not been successfully processed if some kind of I/O error occurred.



Creates a backup of the original file if the file has been modified. `.d2u' is used as backup suffix. On systems with LFN support, the backup suffix will be appended to the file name. If no LFN support is available the backup suffix will overwrite the original file suffix.


Displays a help text and exits.


Repair mode. This mode transforms MSDOS-style EOL (CR/LF) into UNIX-style EOL (LF). It ignores Cntl-Z thus it will not truncate the file. CR sequences in front of LFs are left unchanged. This mode is intended for repairing files that have erroneously been transmited in text-mode instead of binary-mode during a FTP session or with Windows versions of Netscape which have the bad habit to transfer files with such extensions as `.gz', `.bz2', `.tgz' as text files.


Strip mode. It transforms MSDOS-style EOL (CR/LF) into UNIX-style EOL (LF) and strips a CR sequence of arbitrary length from a file, if the sequence followed by a LF. CR sequences that are not followed by a LF are left unchanged. This mode is intended to repair files that have been processed with buggy ports of Unix software, which always blindly add a CR to a LF, even if there is already a CR there.


Timestamp. With this option the timestamp of a modified file will not be preserved. The timestamp of an unmodified file will always be preserved.


Verbose mode. Prints a single line showing the file name and if file processing has been successful or not. The only case that a file is considered as unsuccessfully processed is if an I/O error has occurred.


Very verbose mode. Prints the file name and shows the kind of modifications that have been done to the file. All possible output looks like:

File: foo.c
File unchanged.
At least one CR/LF to LF transformation occurred.
Warning: At least one CR sequence striped from a LF.
Warning: At least one Cntl-Z has been found. File truncated
         at line n.
Warning: At least one LF without a preceeding CR has been found.

Of course, not all of the above lines will appear all together. The first line showing the file name will always be printed. If the file has not been modified at all, then only the next line will be printed. If the file has been modified an appropiate combination of the lines 3 to 6 will be printed, indicating what has been modified. The above output is of some use, e.g.: if dtou reports a LF without a preceeding CR this will be a sure sign that the file is either binary or has inconsistent EOL format for some other reason. If dtou reports that a Cntl-Z (software EOF) has been found, then the file will be truncated at that line and the rest of the file will be lost.

The program is backward compatible with previous program versions if no options are given at all. In this case, an occurrence of Cntl-Z will truncate the file, MSDOS-style EOL (CR/LF) are transformed into UNIX-style EOL (LF) and CR sequence stripping will not happen at all. Also the timestamp will not be alterated and no backup of the original file will be done.

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