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Full Discussion: Incomplete last line
Top Forums Shell Programming and Scripting Incomplete last line Post 302468482 by agama on Tuesday 2nd of November 2010 11:12:57 PM
Old 11-03-2010
Vi is complaining that the last line in the file does not have a terminating newline. Running all of your files through the awk programme that you mentioned will fix the ones that are missing the newline, and will not change the ones that are ok. That is the easy way.

If you really want only to alter just the files that are missing the terminating newline, then try this out:

Code:
#!/usr/bin/env ksh

for x in *
do
        if ! tail -1 $x | od -t x1 | grep -q "0a$"
        then
                echo "fixing $x"
                echo "" >>$x
        else
                echo "$x is ok"
        fi
done

It will run the last line of each file in the current working directory through od, and if the last byte is not 0a (newline), then it will add a newline to the file. Using the echo will be faster as kshell will open and seek to the end where awk would read and write all of the lines in the file -- unnecessary disk i/o.

This should work in bash too, but I didn't test it there.
 

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LEARN ABOUT DEBIAN

shtool-echo

SHTOOL-ECHO.TMP(1)					      GNU Portable Shell Tool						SHTOOL-ECHO.TMP(1)

NAME

       shtool-echo - GNU shtool echo(1) extensional command

SYNOPSIS

       shtool echo [-n|--newline] [-e|--expand] string

DESCRIPTION

       shtool echo is an echo(1) style command which prints string to stdout and optionally provides special expansion constructs (terminal bold
       mode, environment details, date, etc) and newline control. The trick of this command is that it provides a portable -n option and hides the
       gory details needed to find out the environment details under option -e.

OPTIONS

       The following command line options are available.

       -n, --newline
	   By default, output is written to stdout followed by a "newline" (ASCII character 0x0a). If option -n is used, this newline character is
	   omitted.

       -e, --expand
	   If option -e is used, string can contain special "%x" constructs which are expanded before the output is written. Currently the
	   following constructs are recognized:

	   %B  switch terminal mode to bold display mode.

	   %b  switch terminal mode back to normal display mode.

	   %u  the current user name.

	   %U  the current user id (numerical).

	   %g  the current group name.

	   %G  the current group id (numerical).

	   %h  the current hostname (without any domain extension).

	   %d  the current domain name.

	   %D  the current day of the month.

	   %M  the current month (numerical).

	   %m  the current month name.

	   %Y  the current year.

EXAMPLE

	#   shell script
	shtool echo -n -e "Enter your name [%B%u%b]: "; read name
	shtool echo -e "Your Email address might be %u@%h%d"
	shtool echo -e "The current date is %D-%m-%Y"

HISTORY

       The GNU shtool echo command was originally written by Ralf S.  Engelschall <rse@engelschall.com> in 1998 for Website META Language (WML)
       under the name buildinfo. It was later taken over into GNU shtool.

SEE ALSO

       shtool(1), echo(1).

18-Jul-2008							   shtool 2.0.8 						SHTOOL-ECHO.TMP(1)
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