Adding new line at the end of file

Shell Programming and Scripting
1

Hi

I have few files. For some files the cursor is at the end of last line. For other files, cursor is at the new line at the end.

I want to bring the cursor down to next line for the files that are having cursor at the end of last line

In otherwords, I want to introduce a blank line at the end of line, if it doesn't exist

Here is example.. for test_file cusor is at the end of line3. I want to bring the cursor down to the next line. Then only, I can process that file. Please help me. Feel free to ask me if you unable to understand my requirements

***test_file****

line1
line2
line3
line4

2 
for f in your_files;do sed '${/^$/!s/$/\
/;}' "$f">"$f"_ && mv "$f"_ "$f"
done
  1. There is a new line after s/$/\ !!!
  2. If you have GNU sed you can use the -i option
    instead of temporary files.
3

Thank you for your response

It is giving me below error

$ sed '$a' test.webM > ./test.webM_
sed: Function $a cannot be parsed.

I want to introduce a new blank line at the end of file only if it doesn't exist

Thank you
Somesh

4

Yep,
check the corrected version above.

5

Yes.. it is working fine for the files that doens't have a blank line at the end of file

But, if the file already contains a blank line at the end, the modified file is becoming zero bytes. It shouldn't modify the file, if it already has blank line at the end

Please suggest some thing

$ ls -ltr test2.webM
-rw-r--r-- 1 spamarth users 15010 Nov 5 16:34 test2.webM
$ sed '${/^$/!s/$//;}' test2.webM > ./test2
$ ls -ltr test2.webM test2
-rw-r--r-- 1 spamarth users 15010 Nov 5 16:34 test2.webM
-rw-r--r-- 1 spamarth users 0 Nov 5 16:35 test2
$

6

I told you the command is:

sed '${/^$/!s/$/\
/;}' filename

and NOT:

sed '${/^$/!s/$//;}'

It works even on my old Solaris :slight_smile:

$ cat file1
line1
line2
line3
line4
$ cat file2
line1
line2
line3
line4

$ sed '${/^$/!s/$/\
> /;}' file1
line1
line2
line3
line4

$ sed '${/^$/!s/$/\
/;}' file2
line1
line2
line3
line4

$