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Verify the variable has "space" or not?

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# 1  
Old 07-11-2012
Verify the variable has "space" or not?
How to check if a variable contains space in it??? or any other character??? using if condition..
# 2  
Old 07-11-2012
unless its empty it will hopefully contain characters... What do you mean by other?
# 3  
Old 07-11-2012
Code:
grep " " -c

# 4  
Old 07-11-2012
Quote:
Originally Posted by vbe
unless its empty it will hopefully contain characters... What do you mean by other?

a="ind ia"
b="india"

here, variabe a contains space, but b dont...
like this, i want to check that the variable contains i or not...
# 5  
Old 07-11-2012
Code:
a="ind ia"
b="india"
$ echo $a | grep " " -c
1
$ echo $b | grep " " -c
0

# 6  
Old 07-11-2012
Please post what Operating System you have and what Shell you use.

If you are validating a field, it is better to work from a list of valid characters.
What are the valid characters?


If you just want to count the characters, one trick is to delete everything except that character, then count what's left:

Code:
# Counting space characters
echo "abc def"|tr -cd " "|wc -c
1
echo "abcdef"|tr -cd " "|wc -c
0
# Counting "a" characters
echo "abc def"|tr -cd "a"|wc -c
1
echo "abcdef"|tr -cd "a"|wc -c
1


@pamu
The grep -c command counts lines not characters.
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