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Appending newline character End of File

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# 1  
Old 12-30-2013
Appending newline character End of File
Hi Gurus,

Need help. I'm a beginner in Unix. I have a requirement, need to add or append newline (\n) character in file.

Sample Data:

Code:
1|Main|Test|~#
2|Main|Hello|~#
3|Main|Unix|~#
4|Main|File|~#

Output:

Code:
1|Main|Test|~#
2|Main|Hello|~#
3|Main|Unix|~#
4|Main|File|~#\n -- append only for the last line.

Thank You.

Gouri Solleti
Last edited by bartus11; 12-30-2013 at 03:03 PM.. Reason: Please use code tags
# 2  
Old 12-30-2013
Code:
sed '${s/$/\n/}' file

Add the -i switch to the sed command to make the actual change to the file.
# 3  
Old 12-30-2013
Hello Gouri,

Here are 2 approaches may help for same.


1st:
Code:
awk 'NR==1 || NR==2 || NR==3 {print} NR==4 {print $0"\\n"}' add_new_line_char1
 
Output will be as follows.
1|Main|Test|~#
2|Main|Hello|~#
3|Main|Unix|~#
4|Main|File|~#\n



2nd:

Code:
awk '/^4/ {print $0"\\n"} !/^4/' add_new_line_char1
 
Output will be as follows.
 
1|Main|Test|~#
2|Main|Hello|~#
3|Main|Unix|~#
4|Main|File|~#\n


Thanks,
R. Singh
# 4  
Old 12-30-2013
Simplest method use _echo ""_...
Code:
#!/bin/bash --posix
echo "Your example string..."
echo -n "1|Main|Test|~#
2|Main|Hello|~#
3|Main|Unix|~#
4|Main|File|~#" > /tmp/text
hexdump -C < /tmp/text
cat < /tmp/text
echo "Now add a newline at the end..."
echo "" >> /tmp/text
### OR ###
# echo '\n' >> /tmp/text
hexdump -C < /tmp/text
cat < /tmp/text

Results:-
Code:
Last login: Mon Dec 30 18:15:02 on ttys000
AMIGA:barrywalker~> chmod 755 add_nl.sh
AMIGA:barrywalker~> ./add_nl.sh
Your example string...
00000000  31 7c 4d 61 69 6e 7c 54  65 73 74 7c 7e 23 0a 32  |1|Main|Test|~#.2|
00000010  7c 4d 61 69 6e 7c 48 65  6c 6c 6f 7c 7e 23 0a 33  ||Main|Hello|~#.3|
00000020  7c 4d 61 69 6e 7c 55 6e  69 78 7c 7e 23 0a 34 7c  ||Main|Unix|~#.4||
00000030  4d 61 69 6e 7c 46 69 6c  65 7c 7e 23              |Main|File|~#|
0000003c
1|Main|Test|~#
2|Main|Hello|~#
3|Main|Unix|~#
4|Main|File|~#Now add a newline at the end...
00000000  31 7c 4d 61 69 6e 7c 54  65 73 74 7c 7e 23 0a 32  |1|Main|Test|~#.2|
00000010  7c 4d 61 69 6e 7c 48 65  6c 6c 6f 7c 7e 23 0a 33  ||Main|Hello|~#.3|
00000020  7c 4d 61 69 6e 7c 55 6e  69 78 7c 7e 23 0a 34 7c  ||Main|Unix|~#.4||
00000030  4d 61 69 6e 7c 46 69 6c  65 7c 7e 23 0a           |Main|File|~#.|
0000003d
1|Main|Test|~#
2|Main|Hello|~#
3|Main|Unix|~#
4|Main|File|~#
AMIGA:barrywalker~> _

# 5  
Old 12-30-2013
Quote:
Originally Posted by in2nix4life
Code:
sed '${s/$/\n/}' file

Add the -i switch to the sed command to make the actual change to the file.
Below is the command I used:
Code:
sed '${s/$/\n/}' sample.txt

tried
Code:
sed '${s/$/\n/}' >sample.txt

giving error as -
Code:
sed: command garbled: ${s/$/\n/}

---------- Post updated at 01:24 PM ---------- Previous update was at 01:22 PM ----------

Hi Ravinder,

When I used the code, it is working fine for only 4 lines. If I add additional line it is not working. The number of lines in the file could be anything. Which we don't know until the file is generated.

Thank you.
Last edited by Franklin52; 12-30-2013 at 03:31 PM.. Reason: Please use code tags
# 6  
Old 12-30-2013
ok Gouri, could you please let us know at which place or expected output for same so that we can help you more for same.



Thanks,
R. Singh
# 7  
Old 12-30-2013
Try
Code:
awk '1;  END{print ""}' file
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