Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: check if return value is blank
Top Forums Shell Programming and Scripting check if return value is blank Post 302382831 by Franklin52 on Saturday 26th of December 2009 06:24:08 AM
Old 12-26-2009
Some possibilities:

Code:
nofActUsers=$(/usr/sbin/lsof -l | grep "/mast/data/users")

if [ -z "$nofActUsers" ]
then
  echo "nofActUsers is empty"
fi

or:

Code:
if [ "$(/usr/sbin/lsof -l | grep "/mast/data/users")" = "" ] 
then 
  echo "No output"
fi

or:

Code:
usr/sbin/lsof -l | grep "/mast/data/users" > /dev/null

if [ $? -eq 0 ]
then
  echo "Output not blanc, do your stuff..."
fi

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

check for the first character to be blank

I'm having a problem when the first line or first character of a file is blank. I need to get rid of both of them when they occur but don't want to delete the line. Does anyone have any suggestions? (7 Replies)
Discussion started by: anthreedhr
7 Replies

2. Shell Programming and Scripting

awk: How to check if field is blank?

In awk, I'd like to check if a field is blank. And by blank I mean, the field could be "" or " " In other words, the field could either be empty, or be filled with spaces. Would the regex look like this? $5 ~ // { Action }? What other ways are there? Hmm.. in any case I think... (7 Replies)
Discussion started by: yongho
7 Replies

3. Shell Programming and Scripting

how to check weather file is blank or not?

Dear All I want to do following task. Kindly suggest. In my script every hour one file is genarated. say xyz.txt. Now if this file contain some data then i want to do task A and if file is blank then i want to do nothing. Kindly help me to do this. regards jaydeep (5 Replies)
Discussion started by: jaydeep_sadaria
5 Replies

4. Shell Programming and Scripting

[bash] Check if variable is set or blank

Hello guys. In my script, i have the following code: echo "The tarfile contains these directorys" tar -tf file.tar > tarlist.txt cat tarlist | awk -F/ '{print $1 "/" $2}' | nl echo "Enter path of the directory you want to extract or just press enter to extract everything: " read path... (1 Reply)
Discussion started by: noratx
1 Replies

5. Shell Programming and Scripting

how to check the variable values is blank

HI , I have to check the values of variable is blank or not. exm : ###test test1 var=`cate filename | head -1 | cut -c1-3` I need to check the first three character of 1st line . if it is blank .then exit or we need to process . Thanks in advance . (2 Replies)
Discussion started by: julirani
2 Replies

6. UNIX for Advanced & Expert Users

check for users blank passwords

Hello, I have an AIX 5.3 system. I want to check users to see whether there are users with blank passwords but i would prefer to do that without checking /etc/passwd or /etc/security/passwd files. Also while i was searching the web for a solution i noticed that many people refer to /etc/shadow... (2 Replies)
Discussion started by: omonoiatis9
2 Replies

7. Shell Programming and Scripting

shell script to check blank line?

Can someone help to transform the below logic into a shell script, might be easy for some of you. I have a file with below text, I need if the line has the ":" and the above to it is not a blank line should print " <text>: is incorrect format" Apple: vitamin = A... (0 Replies)
Discussion started by: usyseng
0 Replies

8. Shell Programming and Scripting

Request to check:remove entries with blank spaces

Hi I want to remove entries with blank spaces in my input file: 123 234 456 678 56789 345346456 589 3454 345456 3454566............................ (2 Replies)
Discussion started by: manigrover
2 Replies

9. Shell Programming and Scripting

How to check if the file is empty or has blank space.?

Hi, I am using KSH. I am trying to check if the output file is empty or not. I tried with ] but what i see is my file is empty but still manages to have a size of 1 instead of 0. But my file doesnot have anything its empty. I am not sure how to check this. can any one help? (10 Replies)
Discussion started by: Sharma331
10 Replies

10. Shell Programming and Scripting

To check Blank Lines, Blank Records and Junk Characters in a File

Hi All Need Help I have a file with the below format (ABC.TXT) : ®¿¿ABCDHEJJSJJ|XCBJSKK01|M|7348974982790 HDFLJDKJSKJ|KJALKSD02|M|7378439274898 KJHSAJKHHJJ|LJDSAJKK03|F|9898982039999 (cont......) I need to write a script where it will check for : blank lines (between rows,before... (6 Replies)
Discussion started by: chatwithsaurav
6 Replies

LEARN ABOUT ULTRIX

zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)
All times are GMT -4. The time now is 07:33 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy