How to write a Boolean variable which succeed and failed inside the if loop in shell script ?


 
Thread Tools Search this Thread
Top Forums UNIX for Beginners Questions & Answers How to write a Boolean variable which succeed and failed inside the if loop in shell script ?
# 1  
Old 11-05-2019
How to write a Boolean variable which succeed and failed inside the if loop in shell script ?

I have if loop with multiple variable value check in if loop. How can i print only if loop satisfied variable and its value in shell script ? I dont want to check each variable in if loop. That makes my script larger.
Code:

if [[ "${dm}" -gt 0 || "${cl}" -eq 100 || "${ad}" -eq 0 || "${me}" -gt 8 || "${cp}" -gt 0 ]]
        then
         echo "Only satisfied variable with value"
        else
         echo "Only unsatisfied variable with value"
 fi

sample output:
Code:
Varibale cp is 2


Last edited by prince1987; 11-05-2019 at 04:45 PM..
# 2  
Old 11-05-2019
The correct syntax would be something something like this, using arithmetic evaluation:
Code:
if (( dm > 0 || cl == 100 || ad == 0 || me > 8 || cp > 0 )); then

or if you want to use the test utility, the syntax would be like this:
Code:
if [ "${dm}" -gt 0 ] || [ "${cl}" -eq 100 ] || [ "${ad}" -eq 0 ] || [ "${me}" -gt 8 ] || [ "${cp}" -gt 0 ]; then

This User Gave Thanks to Scrutinizer For This Post:
# 3  
Old 11-05-2019
Thanks for your reply, I can correct my syntax. By any chance can you help me on how to print variable and its value which is satisfying the condition in IF loop ?

Thanks,
# 4  
Old 11-05-2019
This will only check if one of the conditions is true, but not which one is true. If you want to find out, which of the expression is true, you will need to check them one by one..

Which means something like this:
Code:
if (( dm > 0 || cl == 100 || ad == 0 || me > 8 || cp > 0 )); then
  if (( dm > 0 )); then
    echo "dm > 0 "
  fi
  if (( cl == 100 )); then
    echo "cl == 100 "
  fi
   if (( ad == 0 )); then
    echo "ad == 100"
  fi
  if (( me > 8 )); then
    echo "me > 8 "
  fi
  if (( cp > 0 )); then
    echo "cp > 0 "
  fi
else
  echo "None of the conditions are true"
fi

--
For a shorthand way, you could try something like this:
Code:
if (( dm > 0 || cl == 100 || ad == 0 || me > 8 || cp > 0 )); then
  (( dm > 0 ))    && echo "dm > 0 "
  (( cl == 100 )) && echo "cl == 100 "
  (( ad == 0 ))   && echo "ad == 100"
  (( me > 8 ))    && echo "me > 8 "
  (( cp > 0 ))    && echo "cp > 0 "
else
  echo "None of the conditions are true"
fi


Last edited by Scrutinizer; 11-05-2019 at 05:27 PM..
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Shell script use two variable in for loop

I want to create a shell script to add a user and modify its comment field mentioned in a file. 1. File value:- username comment field value xyz123 xyztesting abc123 abctesting def123 deftesting 2. i am using below loop to create user... (2 Replies)
Discussion started by: Anil
2 Replies

2. UNIX for Beginners Questions & Answers

Variable inside while loop got reset

hi, I am using hp unix server and not getting variable output present inside the while loop. I have tried changing the code and need to verify whether it is proper practice of code. I am expecting the output of varible RUN_FILE 3 to TRUE which i get inside the while loop. RUN_FILE 1=TRUE... (8 Replies)
Discussion started by: gowthamsoft
8 Replies

3. UNIX for Beginners Questions & Answers

Variable and awk inside for loop

Thanks all for taking time out and reading this thread and big Thanks to all who have come forward for rescue. Background: I have a variable "nbrofcols" that has number of columns from a data file. Now, using this count in for loop, I am trying to get the maximum length of each column present... (7 Replies)
Discussion started by: svks1985
7 Replies

4. UNIX for Dummies Questions & Answers

Write a while loop inside for loop?

I'm taking a unix class and need to countdown to 0 from whatever number the user inputs. I know how to do this with a while or until loop but using the for loop is throwing me off.... I know I can use an if-then statement in my for loop but can I include a while loop in my for loop? (3 Replies)
Discussion started by: xxhieixx
3 Replies

5. Shell Programming and Scripting

help in running while loop inside a shell script

I have an input file at ./$1.txt with content of seq numbers like : 1234567890 1234589700 . . so on.. I need to take each seq nbr from the input file ,run the query below: select ackname,seqnbr from event where event_text like '%seqnbr( from the input file)' and redirect the... (11 Replies)
Discussion started by: rkrish
11 Replies

6. Shell Programming and Scripting

How to give a variable output name in a shell script inside a for loop

Hi all I run my program prog.c in the following way : $ ./prog 1 > output.txt where 1 is a user defined initial value used by the program. But now I want to run it for many a thousand initial values, 1-1000, and store all the outputs in different files. Like $ ./prog 1... (1 Reply)
Discussion started by: alice06
1 Replies

7. Shell Programming and Scripting

scope of a Variable inside shell script

hi all, i'm using the following script, Status=1 Function_do () { while read line; do if ; then #echo $line if ; then Status=0 echo " LINKINK ERROR " fi fi done < ldd.log } Function_do (4 Replies)
Discussion started by: vij_krr
4 Replies

8. Shell Programming and Scripting

variable inside variable inside loop headache

Hi Gurus I have a file called /tmp/CMDB which looks like this serial: 0623AN1208 hostname: server1 model: x4100 assetID: 1234 I am writing a for loop that will go through this file line by line creating a variable of itself. Using the first iteration of the loop (i.e. the first line) as... (6 Replies)
Discussion started by: hcclnoodles
6 Replies

9. Shell Programming and Scripting

Changing value of a variable inside a shell script

I have a continous polling happening inside a shell script on AIX. This actually calls a PL/SQL block. Is there a way I can set up a variable or pass an interrupt to end the script gracefully. I cant read from the config once the job starts running. Ideally I should change value of a variable and... (1 Reply)
Discussion started by: kshyju
1 Replies

10. Shell Programming and Scripting

replacing a number with random variable inside shell script

Hi All. I need help for the below logic. I ve a file like following input file: NopTX(5) // should be remain same as input ----Nop(@100); //1 Nop(90); //2 --Nop(80); //3 @Nop(70); //4 --@Nop(60); //5 @Nop@(@50); //6 --Nop@( 40); ... (3 Replies)
Discussion started by: user_prady
3 Replies
Login or Register to Ask a Question