Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Blank line in command output

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Blank line in command output
# 1  
Old 02-14-2011
Blank line in command output
My script ssh's to another server and gathers information then process them. The problem is that the output of a command has an unwanted "blank lines".
...
Code:
ssh user1@${server1} /usr/bin/ls -l /tmp/file1 | awk '{print $5}' > ${DATAFILE}

...

Code:
$ cat  ${DATAFILE}

123456789 (There's a blank line before the numbers)

Please help me get rid of these blank lines.

Thanks in advance.
Last edited by Franklin52; 02-15-2011 at 03:07 AM.. Reason: Please use code tags
# 2  
Old 02-14-2011
Code:
ssh user1@${server1} /usr/bin/ls -l /tmp/file1 | awk '!/^$/ {print $5}' > ${DATAFILE}

# 3  
Old 02-14-2011
Code:
awk 'NF>0{print $5}' > ${DATAFILE}

# 4  
Old 02-15-2011
Thanks for your suggestions honglus & yinyeumi, but still not working... it's putting a blank line "" before the real output.
# 5  
Old 02-15-2011
Code:
awk 'NF>3{print $5}'

# 6  
Old 02-16-2011
This command worked:
Code:
ssh user1@${server1} /usr/bin/ls -l /tmp/file1 | awk 'NF>3{print $5}' > ${DATAFILE}

Thanks yinyuemi!

ps. what's the difference between
Code:
awk 'NF>0{print $5}'

and
Code:
awk 'NF>3{print $5}'?

Last edited by Franklin52; 02-17-2011 at 04:00 AM..
# 7  
Old 02-16-2011
you can run first
Code:
/usr/bin/ls -l /tmp/file1

then you wil find the first line is not blank line, NF is less then 3.

Y
This User Gave Thanks to yinyuemi For This Post:
pdtak
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to read the output of a command line by line and pass it as a variable?

Hi, I have some 2000 names in a table like below. Java Oracle/SQL ANSI SQL SQL,DWH,DB DB&Java And by using for loop in my code i am able to get a single word but if there is any special character or space then it is considering as a next line. I have to execute the below queries in... (10 Replies)
Discussion started by: Samah
10 Replies

2. Shell Programming and Scripting

In a file, replace blank line by the last line not blank above

Dear All, In a CSV file, say that a given column has been extracted. In that column, information is missing (i.e. blank lines appear). I would like to replace the blank lines by the last valid line (not blank) previously read. For example, consider the extract below: 123 234 543 111... (7 Replies)
Discussion started by: bagvian
7 Replies

3. Shell Programming and Scripting

sed command is saving output as blank file

Hi, I am working on a script where I am adding adding colors to few of the info in the output. Now , after that is done , I see colour codes in log files which I don't want to see.:mad::mad::mad::mad: So , I tried using sed command in script as below which gives me o/p (new.log) as blank file... (7 Replies)
Discussion started by: Dream4649
7 Replies

4. Shell Programming and Scripting

sed command to replace a line in a file using line number from the output of a pipe.

Sed command to replace a line in a file using line number from the output of a pipe. Is it possible to replace a whole line piped from someother command into a file at paritcular line... here is some basic execution flow.. the line number is 412 lineNo=412 Now i have a line... (1 Reply)
Discussion started by: vivek d r
1 Replies

5. Shell Programming and Scripting

Blank as variable/output when run from command line

When I run this: PDHDURL=`/usr/bin/curl --silent http://www.phdcomics.com/comics.php | /usr/bin/grep -o http://www.phdcomics.com/comics/archive/.*.gif | head -1` echo -e "$PHDURL" It is totally blank. However, when I just run it from the terminal: /usr/bin/curl --silent... (2 Replies)
Discussion started by: killer54291
2 Replies

6. Shell Programming and Scripting

deleting blank line and row containing certain words in single sed command

Hi Is it possible to do the following in a single command /usr/xpg4/bin/sed -e '/rows selected/d' /aemu/CALLAUTO/callauto.txt > /aemu/CALLAUTO/callautonew.txt /usr/xpg4/bin/sed -e '/^$/d' /aemu/CALLAUTO/callautonew.txt > /aemu/CALLAUTO/callauto_new.txt exit (1 Reply)
Discussion started by: aemunathan
1 Replies

7. Shell Programming and Scripting

Replace two blank line with a single blank line

Hi Guys, I have a file in which each set of records are separated by two blank line. I want to replace it with a single blank line. Can you guys help me out? Regards, Magesh (9 Replies)
Discussion started by: mac4rfree
9 Replies

8. Shell Programming and Scripting

Need help in sed command (adding a blank line btw each block generated by pattern)

Hello friends, I have a C source code containing sql statements. I use the following sed command to print all the sql blocks in the source code.... sed -n "/exec sql/,/;/p" Sample.cpp The above sed command will print the sql blocks based on the pattern "exec sql" & ";"... (2 Replies)
Discussion started by: frozensmilz
2 Replies

9. UNIX for Dummies Questions & Answers

cant find command that returns blank line

This is my list of sed commands: can anyone tell me where im going wrong. The script works on a file called data which contains 6 student id's and there answers for 6 questions. !/bin/sh sed -e 's/*//g' \ #replace * with nothing -e s/ /X/g' \ #replacing empty space with X -e... (2 Replies)
Discussion started by: jeffersno1
2 Replies
Login or Register to Ask a Question