append newline to files with incomplete last line Post: 49940

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Top Forums UNIX for Dummies Questions & Answers append newline to files with incomplete last line Post 49940 by ziyi on Wednesday 14th of April 2004 04:03:40 AM

04-14-2004

Registered User

append newline to files with incomplete last line

Hi all,

Is there any way I can check a file for the linefeed character at the end of the file, and append one only if it is missing (ie. Incomplete last line)?

Need to do this because I need to write a script to process files FTP-ed over from various machines, which may or may not be running UNIX. The files are not supposed to have any trailing blank lines after the last line. I also need to compare the number of lines in the file with a corresponding file which contains the number of lines expected in the first file, and process the file only if the numbers are equal.

My problem now is that files created on the Windows platform always have this "Incomplete last line" error when opened with vi after doing a dos2unix operation. This causes wc to count one less line than what is in the file, and the script fails when comparing the number of lines.

I tried using
  echo >> $filename
but while it solves the incomplete last line problem with the Windows-created files, it also appends a new line to the UNIX-created files.

Thanks!

ziyi

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LEARN ABOUT OPENDARWIN

uniq

UNIQ(1) 						    BSD General Commands Manual 						   UNIQ(1)

NAME

     uniq -- report or filter out repeated lines in a file

SYNOPSIS

     uniq [-c | -d | -u] [-i] [-f num] [-s chars] [input_file [output_file]]

DESCRIPTION

     The uniq utility reads the specified input_file comparing adjacent lines, and writes a copy of each unique input line to the output_file.	If
     input_file is a single dash ('-') or absent, the standard input is read.  If output_file is absent, standard output is used for output.  The
     second and succeeding copies of identical adjacent input lines are not written.  Repeated lines in the input will not be detected if they are
     not adjacent, so it may be necessary to sort the files first.

     The following options are available:

     -c      Precede each output line with the count of the number of times the line occurred in the input, followed by a single space.

     -d      Only output lines that are repeated in the input.

     -f num  Ignore the first num fields in each input line when doing comparisons.  A field is a string of non-blank characters separated from
	     adjacent fields by blanks.  Field numbers are one based, i.e. the first field is field one.

     -s chars
	     Ignore the first chars characters in each input line when doing comparisons.  If specified in conjunction with the -f option, the
	     first chars characters after the first num fields will be ignored.  Character numbers are one based, i.e. the first character is
	     character one.

     -u      Only output lines that are not repeated in the input.

     -i      Case insensitive comparison of lines.

DIAGNOSTICS

     The uniq utility exits 0 on success, and >0 if an error occurs.

COMPATIBILITY

     The historic +number and -number options have been deprecated but are still supported in this implementation.

SEE ALSO

     sort(1)

STANDARDS

     The uniq utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

HISTORY

     A uniq command appeared in Version 3 AT&T UNIX.

BSD
								   June 6, 1993 							       BSD

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