Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Check for numeric inputs

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Check for numeric inputs
# 1  
Old 08-20-2007
Check for numeric inputs
Hi All,

How do i modify the below script such that if the input is numeric, it will give the numeric digit, else it will ouput "0"

Code:
echo "xxx"  | awk '/^[0-9]+$/'

# 2  
Old 08-21-2007
MySQL
Quote:
Originally Posted by Raynon
Hi All,

How do i modify the below script such that if the input is numeric, it will give the numeric digit, else it will ouput "0"

Code:
echo "xxx"  | awk '/^[0-9]+$/'

Here is the script that will do for you..

#!/bin/ksh
echo "Digits as input"
read number

test=`echo "$number" | egrep "^[0-9]+$"`

if [ "$test" ]
then
echo "Entered number is a digit"
else
echo "0"
fi

Instead of egrep you can use awk,grep or any command for searching patterns.

Thanks
Namish
# 3  
Old 08-21-2007
typeset -i x

will force $x to be a number
# 4  
Old 08-21-2007
hi namishtiwari,

I'm using csh shell. Is there a csh version of your code ?
# 5  
Old 08-21-2007
not sure this will work in csh
Code:
..
case $x in
    *[!0-9]*|"") echo "0";;
    *) echo $x;;
esac

# 6  
Old 08-21-2007
Hi all,

I think i have some idea of converting your ksh to csh.
See below!

Thanks all for the help!!!

Code:
#!/bin/csh

echo -n "Pls input: "
set number = ($<)

test=`echo "$number" | egrep "^[0-9]+$"`

if [ "$test" ] then
echo "Entered number is a digit"
else
echo "0"
endif

# 7  
Old 08-22-2007
c shell considered harmful
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Noob question: How to check the total number of inputs entered by user?

Say I have this line: read -p "Enter 3 numbers: " num1 num2 num3; I want to write a while loop that repeatedly asks for input if the number of inputs entered is not equal to 3. I don't know the correct command to find the number of inputs entered. Help, please? (4 Replies)
Discussion started by: jejemonx
4 Replies

2. Shell Programming and Scripting

Check whether input is numeric

Hello there, find below for my code first: $pdp_asaba=`cat /tmp/temp_total | grep asaba | sed 's/*//g'` if ]] then pdp_asaba=0 fi $pdp_abuja=`cat /tmp/temp_total | grep abuja | sed 's/*//g'` if ]] then pdp_abuja=0 fi $pdp_ojota=`cat /tmp/temp_total | grep ojota | sed 's/*//g'` if ... (3 Replies)
Discussion started by: infinitydon
3 Replies

3. Shell Programming and Scripting

check if a string is numeric

I checked all the previous threads related to this and tried this. My input is all numbers or decimals greater than zero everytime. I want to check the same in the korn shell script. Just validate the string to be numeric. This is what I am doing. var="12345" if ) -o "$var" !=... (14 Replies)
Discussion started by: megha2525
14 Replies

4. Shell Programming and Scripting

How to check for a Numeric Value?

Using shell, I have a variable, how can I check that variable for a numeric value such as "41.0"? My program needs to do one things if the numeric value is found, and another if something else such as a string of letter is found. is there a specific character that denotes a numeral? The... (2 Replies)
Discussion started by: chagan02
2 Replies

5. Shell Programming and Scripting

How to check if a column is having a numeric value or not in a file?

Hi, I want to know, how we find out if a column is having a numeric value or not. For Example if we have a csv file as ASDF,QWER,GHJK,123,FGHY,9876 GHTY,NVHR,WOPI,623,HFBS,5386 we need to find out if the 4th and 6th column has muneric value or not. Thanks in advance Keerthan (9 Replies)
Discussion started by: keerthan
9 Replies

6. Shell Programming and Scripting

How to check if the file contains only numeric values

How to check if the file contains only numeric values. I don't want to read entire file it eats lot of cpu Or any way which consumes less memory n cpu.. Please suggest -S (2 Replies)
Discussion started by: sunilmenhdiratt
2 Replies

7. Shell Programming and Scripting

Check for Numeric output in Perl

Hi All, I would like to convert my below csh script to Perl. Can any expert help ? # To check for numeric input set tested1 = `echo "$tested"| awk '/^+$/'`; # To remove un-neccessary zeros set tested2 = `echo "$tested"|awk '{print $0+0}'`; (3 Replies)
Discussion started by: Raynon
3 Replies

8. Programming

check the given string is numeric or not.

Hi, how to check the given string is numeric or not , without converting ( using strtol...). for ex: if string is C01 - non-numeric data if string is 001 - numeric data TIA (11 Replies)
Discussion started by: knowledge_gain
11 Replies

9. Shell Programming and Scripting

check whether it is a non-numeric character

Below is the abstract of the script which is working fine. if ] then error_process "Invalid month format." return 1 fi I am doing validation for month and it errors if the value is > 12 or < 0. In addition, I want to add another condition to error if it... (2 Replies)
Discussion started by: sony_dada
2 Replies

10. Shell Programming and Scripting

to check variable if its non numeric

if test $b -ne then echo "\n\n\n\tPassword reset has been done successfully" else echo "\n\n\n\tAn error occurred" fi i want to check whether $b is non-numeric so how to do that? (3 Replies)
Discussion started by: sachin.gangadha
3 Replies
Login or Register to Ask a Question