Shell Programming and Scripting

A noddy way using a shell script would be:-

Code:

#!/bin/ksh
while read line
do
   echo "$line\c"
done < inputfile > outputfile

Be warned that if you have a large file, this could be horribly slow.




Robin
Liverpool/Blackburn
UK

What exactly do you want to do? Remove blank lines from your input, remove all newline characters, or just remove the last newline character?

Also, you never told us what distribution (OS) you're using.

Code:

#!/bin/ksh
while read line
do
   echo "$line\c"
done < inputfile > outputfile

This removed all new line characters. I want only last to be removed.

Ques: What exactly do you want to do? Remove blank lines from your input, remove all newline characters, or just remove the last newline character?
Ans: I want only last new line character to be removed.

i.e.
My data is

Code:

A<new line>
B<new line>
c<new line>
D<new line>

So If I open the file cursor is at the new line below D. I want that cursor should be just after D. I want only last <new line> to be removed.

Ques: OS distribution.
Ans: Sorry, please tell me how to check.

---------- Post updated at 09:37 PM ---------- Previous update was at 08:54 PM ----------

Code:

last=$(tail -1 echo_hsa_file.txt)
sed '$d' < echo_hsa_file.txt > echo_hsa_file1.txt
echo "${last}"\\c  >> echo_hsa_file1.txt

This worked.Thanks all for all the help.

Moderator's Comments:

Please use code tags. Video tutorial on how to use them

I am guessing the OP was working with a DOS file, and that that is why all the options did not work, since the lines are not empty because of the Carriage Return present at the end of each line, before the linefeed. The last option did work since it deleting the last line, no matter what is on there...

I suggest trying this first:

Code:

tr -d '\r' < infile > outfile

Before trying any of the other suggestions.

We think alike. My guess was that there was a MSDOS ctrl/Z character at the end of the file.

Code:

$$ C=`wc -c < filename`
$$ D=`tail -c +$C < filename`
$$ if [ $D = $CR ]
then
C=`expr $C - 1`
head -c +$C < filename >filename
fi

This code can be used to traverse a list of filenames in a shell script and removing the last newline charaacter from it if it is present in that file.

Code:

 
sed '$d' file
 
Test environment ： centos 5.5