Visit The New, Modern Unix Linux Community

Remove blank line - SED

Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Remove blank line - SED
# 8  
Mac line endings are Carriage Returns, so just converting CR to LF should make the file Unix-friendly.

tr '\r' '\n' <oldfile >newfile

Again, I urge you to search this site if this does not work directly; this question gets asked and answered every week in one form or another.
# 9  
To remove DOS-style line breaks:

sed '/^M$//' oldfile > newfile

Notice, that "^M" is a literal line break: in vi press "<CTRL>-<V>", then hit <ENTER> to enter it. You will notice that it is a single character rather than two chars.

To remove lines which contain any number of whitespace (Tabs and or blanks):

sed '/^[<tab><blank>]*$/d' oldfile > newfile

Enter a literal TAB-char (press <TAB>) and a blank, i just wrote it that way to make it easier to read.

Finally, to find out which unprintable character is bothering you: open the file in vi, enter command mode (press ":") and enter "set list". You will see all the unprintable characters as control codes now (tab characters are represented by "^I" for instance, etc.). Only a blank is now printed as blank char. Enter command mode again and use "set nolist" to switch that off again.

I hope this helps.

# 10  
Or you can use cat with the -v or -A options (somewhat depending on your version of cat), or look at a hex dump with od or xxd or hexdump
# 11  
you can simply remove the blank line by doing
grep . file1 > file2

Previous Thread | Next Thread
Thread Tools Search this Thread
Search this Thread:
Advanced Search

Test Your Knowledge in Computers #265
Difficulty: Easy
Alan Turing was prosecuted by the UK in 1952 for homosexual acts.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Bash - sed - Remove first word from line which can begin eventually with blank

hello. How to remove first word from line. The line may or may not start with blank. NEW_PARAM1=$(magic-command " -t --protocol=TCP -P 12345-u root -h localhost ") NEW_PARAM2=$(magic-command "-t --protocol=TCP -P 12345 -u root -h localhost ") I want NEW_PARAM1 equal to NEW_PARAM2 equal ... (2 Replies)
Discussion started by: jcdole
2 Replies

2. Shell Programming and Scripting

sed - How to insert line before the first blank line following a token

Hello. I have a config file (/etc/my_config_file) which may content : # # port for HTTP (descriptions, SOAP, media transfer) traffic port=8200 # network interfaces to serve, comma delimited network_interface=eth0 # set this to the directory you want scanned. # * if have multiple... (6 Replies)
Discussion started by: jcdole
6 Replies

3. Shell Programming and Scripting

Remove Space and blank line from file in UNIX shell script

I have below file. I want to remove space at begining of every line and then after also remove blank line from file. I use below code for each operation. sed -e 's/^*//' < check.txt > check1.txt sed '/^\s*$/d' < check1.txt > check2.txt above code not remove all the space... (12 Replies)
Discussion started by: Mohin Jain
12 Replies

4. Shell Programming and Scripting

How to remove blank line from a text file?

Hi All, I am creating a text file using perl. The first record I am writing as "$line" and all the other as "\n$line". At the end the file is having N number of lines. I am using this file for MLOAD (Teradata), which is reading N+1 lines in the file and failing.I am not able to find new line... (2 Replies)
Discussion started by: unankix
2 Replies

5. Shell Programming and Scripting

Delete lines containing and remove the blank line at the same time

Is there a way to delete a line containing something and the blank line at the same time? If you do this it leaves a blank line behind. sed '/yum/d' .bash_historyI know this works but I would think there would be a way to do it with one command sed '/yum/d' .bash_history | sed '/^$/d'In... (2 Replies)
Discussion started by: cokedude
2 Replies

6. Shell Programming and Scripting

sed adding a blank line

I use the following as part of a script to correct for a faulty hostname file. # get the domain name read -r thehostname < /etc/hostname dom="$(echo $thehostname | cut -d'.' -f2)" numchar=${#dom} if then echo "It appears as though the hostname is not correctly set." echo "Hostname has... (5 Replies)
Discussion started by: bugeye
5 Replies

7. UNIX for Dummies Questions & Answers

Question: Help need to remove blank line & sed: Couldn't re-allocate memory error.

I've shell script where i used the below command to take the line which contains patterns. sed -n "/$year 05:/,/$year 17:/p" trace.log | grep -f patterns.txt > output.log This was working fine for long time, but now a days this script is not working with and throwing error like sed:... (8 Replies)
Discussion started by: senthil.ak
8 Replies

8. Shell Programming and Scripting

Remove last blank line of file

I have a number of files (arranged in directories) which have last line blank, I am trying to synchronize my code with other env and due to this blank lines, all files error out as different although only difference is that of balnk line at end of file. Is there a way I can recursively... (2 Replies)
Discussion started by: ruchimca
2 Replies

9. Shell Programming and Scripting

sed: print out to first blank line

I am trying to use wget and sed to extract a text based weather forecast for the Greater Victoria area only, this is one paragraph of many in a web page. I have tried /^$/ but that does not seem to work. So far I get mostly what I want with this: wget -qO -... (2 Replies)
Discussion started by: lagagnon
2 Replies

10. Shell Programming and Scripting

sed: delete regex line and next line if blank

Hi, I want to write a sed script which from batiato: batiato/giubbe: pip_b.2.txt pip_b.3.txt pip_b.3mmm.txt bennato: bennato/peterpan: 123.txt consoli: pip_a.12.txt daniele: (2 Replies)
Discussion started by: one71
2 Replies

Featured Tech Videos