Visit Our UNIX and Linux User Community

shell / awk doubt

Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users shell / awk doubt
# 1  
Old 01-10-2002
shell / awk doubt

Hi all,

I have a ascii text file like this :

$cat a.txt

abc |12343 |xyakdfj |
x |323 ||
kr1 |13434343|234343 |

Is it possible to to get the file eleminating blank spaces?

output file :


using korn shell or awk

thanks in advance

# 2  
Old 01-10-2002

cat a.txt | sed -e "s/ //g"
cat a.txt | awk 'gsub(" ", "")'

Last edited by shaik786; 01-10-2002 at 07:37 AM..
# 3  
Old 01-17-2002
cat a.txt | awk 'gsub(" ", "")'
That awk solution, with gsub as a pattern match, will print only lines where gsub changes the line, so you can lose lines.

To retain all your lines:
awk '{gsub(" ","");print}' a.txt

# 4  
Old 01-18-2002
I'm not trying to be a jerk here, but there is not reason to be using "cat" in any of the above example.

Instead of
cat a.txt | sed -e "s/ //g"
you can do:
sed 's/ //g' a.txt
and for this one:
cat a.txt | awk 'gsub(" ", "")'
you can do:
awk 'gsub(" ","")' a.txt

You can always pipe to those commands, but there's no need to use cat to dump a file.
# 5  
Old 01-18-2002
Yep, agree with that (and notice that my suggested correction dropped the cat).
# 6  
Old 01-18-2002
Sure did... Smilie

I can't remember the URL to a page that has various awards for using cat too much... If I find it, I'll post back.
# 7  
Old 01-23-2002
Alternative way

Try this if you don't want to use awk

cat <filename> | tr -d '" "'

Previous Thread | Next Thread
Test Your Knowledge in Computers #719
Difficulty: Medium
Alan Minsky wrote the book Artificial Neural Networks, attacking the work of Frank Rosenblatt, which became the foundational work in the analysis of artificial intelligence applications in machine learning.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Doubt in awk

Hi, I got a below requirement from this forum, but the solution provided was not clear. Below is the requirement Input file A 1 Z A 1 ZZ B 2 Y B 2 AA Required output B Y|AA A Z|ZZ (5 Replies)
Discussion started by: stew
5 Replies

2. UNIX for Dummies Questions & Answers

a doubt in awk

instead of writing print command in awk, i saw in some posts that we can simply write a number before we end the awk command and it will print the file. As given below: $awk '{some manipulation; print}' filename $awk '{some manipulation}1' filename I also tried replacing the... (2 Replies)
Discussion started by: PranavEcstasy
2 Replies

3. Shell Programming and Scripting

Awk doubt

I have a file sample.txt with the following contents: the following gives output as awk 'NF{s=$0; print s}' sample.txt but, awk 'NF{s=$0}{print s}' sample.txtgives output as why this difference, can someone explain me? (6 Replies)
Discussion started by: royalibrahim
6 Replies

4. Shell Programming and Scripting

doubt on awk

I have executed the below command: find . -name "Ks*" -type f -exec ls -ltr {} \; | awk '{printf("%ld %s %d %s \n",$5,$6,$7,$8,$9)}' and here is the output: 1282 Oct 7 2004 51590 Jul 10 2006 921 Oct 7 2004 1389 Jun 4 2003 1037 May 19 2004 334 Mar 24 2004 672 Jul 8 2003 977... (6 Replies)
Discussion started by: venkatesht
6 Replies

5. Shell Programming and Scripting

Doubt in awk

Hi All, I have two files as given below: fileA 1234|aaaaa|vvvv 2222|bbbbbb|cbxxbjh 3333|cccc|jhjhj fileB 3434|bbbcc|cbxxbjh 1234|cat|bullet 3333|cccc|jhjhj I need a script that reads the first column from fileA (i.e 1234) and searches in fileB in the first parameter(i.e first... (7 Replies)
Discussion started by: jisha
7 Replies

6. Shell Programming and Scripting

doubt in awk

Hi , I have a file in the below format: 1.txt awk 'BEGIN { printf ("%1s", "man" )} ' awk 'BEGIN { printf ("%9s", "women" )} ' awk 'BEGIN { printf ("%56s", "human")} ' ## ### ## echo "$!" ## awk 'BEGIN { printf ("%1s", "aaa" )} ' awk 'BEGIN { printf ("%19s", "bbb" )} ' ... (4 Replies)
Discussion started by: jisha
4 Replies

7. Shell Programming and Scripting

awk doubt

hi how to get the values in two columns (may be 2nd and 5th column) of a file line by line. either i want to get the two fields into different variables and use a for loop to get these values line by line. (3 Replies)
Discussion started by: Pradee
3 Replies

8. Shell Programming and Scripting

awk doubt..

Hello, Iam trying to get the IP of the hostname of the machine from /etc/hosts. I used the command as below: But the result shows the IP with the hostname.. like I need to get only Please help Thanks in advance esham (11 Replies)
Discussion started by: esham
11 Replies

9. Shell Programming and Scripting

doubt in AWK

Hi all, column1 -------- 33 44 55 66 please provide the script using awk command to dispaly output 55. Help apperciated.. thanks, Nirmal (4 Replies)
Discussion started by: abnirmal
4 Replies

10. UNIX for Dummies Questions & Answers

awk doubt

I'm having a file with 5 fields. I want to sort that file according to one field no 3. How shall I do using awk programming. Any input appreciatable. regards, vadivel. (7 Replies)
Discussion started by: vadivel
7 Replies

Featured Tech Videos