Sponsored Content
Top Forums Shell Programming and Scripting Checking for null condition in a UNIX variable Post 302827949 by rafa_fed2 on Monday 1st of July 2013 07:18:49 AM
Old 07-01-2013
Quote:
Originally Posted by zzavilz
Code:
cat sql_output.txt|while read line
do
  typeset -i charCount=`echo $line|wc -c`
  if [[ $charCount -eq 1 ]]; then
    echo "no ids to execute"
  else
    echo "some scipts command"
  fi
done

Thanks zzav for the reply.But Rudi solution seems more simpler than you .Smilie
I implemented that

what does while read line and typeset do in your code.

i think your code will be useful where there are some lines prenet along with ids.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Condition checking

Dear all That's another problem from me, i wanna do a lot of if statement checking for correct input by user, will be prompt input again if the input not meet the requirement defined by If or while statement... like this one .... while I know it's less effiency write the program... (14 Replies)
Discussion started by: trynew
14 Replies

2. Shell Programming and Scripting

How can find Null value in If condition

Hi, i wrote If Conditions in my script, it's returns null and some values. but i am unable to find when Null value getting. bec we need modification according null vales. pls help me on this. (2 Replies)
Discussion started by: koti_rama
2 Replies

3. UNIX for Dummies Questions & Answers

How to compare null and space using single if condition

Hi I have a input file with many fields and each filed will be with in double quotes(""). i want to check fields contains balnk,null or space using condition using if. when i write code as below for if condition its not working a=`awk -F ',' '{gsub("\"", "", $1);'NF==0';printf $1}'... (3 Replies)
Discussion started by: jayakumarrt
3 Replies

4. Shell Programming and Scripting

Checking for null value

Dear All, I'm glad that I've also joined in this forum. Good work fellas... :b: Keep going...! :) I am having a .csv file where I am reading the values with comma(,) as delimiter. After reading each and every values, I would like to check whether it is empty (say null or blank spaces). How... (4 Replies)
Discussion started by: ganapathi.t
4 Replies

5. Programming

C++ segmentation fault while checking for null pointer

void disptree(node *ptr) { if ((ptr->left) !=NULL) disptree(ptr->left); cout<<"Position:"<<ptr->pos<<" Data:"<<ptr->data<<endl; if ((ptr->right)!=NULL; disptree(ptr->right); } i'm getting a segmentation fault at the red line. i cannot understand what's the problem.... (3 Replies)
Discussion started by: vijaymrt
3 Replies

6. Programming

Checking an array for NULL in C++

Hello All, I have this question that how to check for an array for NULL? For eg. #include<iostream.h> using namespace std; int main() { char arr; if(arr == NULL) { cout<<"NULL"; } } Thanks a lott in advance!!! (3 Replies)
Discussion started by: mind@work
3 Replies

7. Shell Programming and Scripting

NULL checking

Hi I need to check the output of a string to null. For eg the output I get for $KIT is empty. So want to echo something when the output is empty. How can I do that? Thanks in advance (6 Replies)
Discussion started by: Ananthdoss
6 Replies

8. Shell Programming and Scripting

Checking the variable in UNIX

Hi, I have a file abc.txt as ABC,TYU,1.2566 AHG,GJJ,1.898 hgh,FGA,1.854 My program is reading each line and storing the values variables base_cy, quo_cy, ra_amt Need to validate each of them as in: base_cy and quo_cy should be a 3 character alphabet among A-Z, if it is lower case ... (1 Reply)
Discussion started by: infyanurag
1 Replies

9. Shell Programming and Scripting

Condition checking in UNIX

i have a script where i have to find the age of a file, if then echo "dnb file is present for the monthly load" >> $RUNLOG dnb="1" else echo "dnb file has not arrived yet" > $ERRLOG dnb="0" fi i know the file is available so... (3 Replies)
Discussion started by: lovelysethii
3 Replies

10. Shell Programming and Scripting

If condition to check null variable

Guys, Please help me on the below sample.cfg var=NULL sample.sh #!/bin/sh . /sample.cfg if ;then 1 st command here else 2 nd command here fi (3 Replies)
Discussion started by: AraR87
3 Replies
echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
All times are GMT -4. The time now is 12:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy