Sponsored Content
Top Forums UNIX for Dummies Questions & Answers How to find the null member or blank in the text file? Post 302891913 by alister on Sunday 9th of March 2014 02:44:12 PM
Old 03-09-2014
Quote:
Originally Posted by ahamed101
If your grep supports -q, then you can avoid using /dev/null
Code:
...
grep -q -m1 "^ *$" file
...

-q exits immediately if a match is found, so -m1 serves no purpose.

Regards,
Alister
This User Gave Thanks to alister For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Find null fields in file

Hi All, I have some csv files out of which i want to find records which have empty values in either the 14th or 16th fields. The following is a sample. $cut -d',' -f14,16 SPS* | head -5 VOIP_ORIG_INFO,VOIP_DEST_INFO sip:445600709315@sip.com,sip:999@sip.com... (2 Replies)
Discussion started by: rahulrathod
2 Replies

2. Shell Programming and Scripting

KSH script -text file processing NULL issues

I'm trying to strip any garbage that may be at the end of my text file and that part is working. The problem only seems to be with the really long lines in the file. When the head command is executed I am directing the output to a new file. The new file always get a null in the 4096 position but... (2 Replies)
Discussion started by: geauxsaints
2 Replies

3. Shell Programming and Scripting

Remove blank spaces in a text file...

Hi, I have this problem that there are blank spaces in my text file... i want to remove them line 1 line 2 line 3 I want to remove the space between line 2 and line 3... I tried sed... it work but it prints the whole text file at the command prompt which i dont want.... sde i tried was... (4 Replies)
Discussion started by: bhagya2340
4 Replies

4. Shell Programming and Scripting

Find out if few fields in a file are null

Hi, I've a pipe delimited file where I want to find out a number of lines where 1st 2nd and last field are null using awk/sed. Is it possible? Thanks (5 Replies)
Discussion started by: rudoraj
5 Replies

5. Shell Programming and Scripting

Replace blank spaces with semicolon - text file

Hi all, Been trying to find a solution to this, I'm sure its a sed 1 liner, but I don't know sed well enough to work it out... I have a text file in the following format: 431 666 1332 2665 0.24395 432 670 ... (3 Replies)
Discussion started by: mpcengineering
3 Replies

6. Shell Programming and Scripting

Awk script to replace null columns with blank

I have a file with contents "08011"||20080812 "23348"|20080827|20080924 "23387"|20080829|20080915 "23581"|20081003|20081028 "23748"|20081017|20090114 "24095"|20080919|20081013 "24105"|20070723|20070801 "24118"|20080806|20081013 "24165"|20080820|20080912 "24221"|20080908|20080929 i... (3 Replies)
Discussion started by: sonam273
3 Replies

7. 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

8. Shell Programming and Scripting

Verify the null filed of the text file

Here is my sample data Test.txt column 1|columne 2|columne 3|columne 4 test|test||test test|test|test| test||test|test test|test|test|test |test|test|test In that example having NULL value of the row 2-column 3,row 3-column 4,row 4 - column 2,row 6- column 1 How i can validate... (5 Replies)
Discussion started by: krish2014
5 Replies

9. Shell Programming and Scripting

How to search for blank fields in a text file from a certain position?

Sample txt file : OK00001111112| OK00003443434|skjdaskldj OK32812983918|asidisoado OK00000000001| ZM02910291029|sldkjaslkjdasldjk what would be the shell script to figure out the blank space (if any) after the pipe sign? (4 Replies)
Discussion started by: chatwithsaurav
4 Replies

10. Shell Programming and Scripting

How to sort a text file if certain columns are blank?

Dear all, I am trying to sort a text file based on column 3, 10, 11 and 12. But certain column are blank for some lines. Column 3 has to be in ascending order after sorting. Part of my input file is as follows: CN727990 1 A01 4703 5083 73.28 - A_scaffold000011 4365605 4365985 73.28 +... (10 Replies)
Discussion started by: huiyee1
10 Replies
textutil::repeat(n)				    Text and string utilities, macro processing 			       textutil::repeat(n)

__________________________________________________________________________________________________________________________________________________

NAME
textutil::repeat - Procedures to repeat strings. SYNOPSIS
package require Tcl 8.2 package require textutil::repeat ?0.7? ::textutil::repeat::strRepeat text num ::textutil::repeat::blank num _________________________________________________________________ DESCRIPTION
The package textutil::repeat provides commands to generate long strings by repeating a shorter string many times. The complete set of procedures is described below. ::textutil::repeat::strRepeat text num This command returns a string containing the text repeated num times. The repetitions are joined without characters between them. A value of num <= 0 causes the command to return an empty string. Note: If the Tcl core the package is loaded in provides the command string repeat then this command will be implemented in its terms, for maximum possible speed. Otherwise a fast implementation in Tcl will be used. ::textutil::repeat::blank num A convenience command. Returns a string of num spaces. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category textutil of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. SEE ALSO
regexp(n), split(n), string(n) KEYWORDS
blanks, repetition, string CATEGORY
Text processing textutil 0.7.1 textutil::repeat(n)
All times are GMT -4. The time now is 09:10 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy