string manipulation


 
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# 1  
Old 10-29-2006
string manipulation

Hello,

I have a korn shell string variable

str1 = "A,B,Z"

I would like to create another korn shell string variable

str2 = "letter = 'A' or letter = 'B' or letter = 'Z' "

Please help!

Thanks in advance

an UNIX newbie!
# 2  
Old 10-29-2006
Are you looking for something like this:
Code:
str1="A,B,Z"
str2=`echo $str1 | cut -d, -f1`

Use -f2 for letter B and -f3 for letter Z.
# 3  
Old 10-29-2006
Thanks for quick response!

The problem is that str1 may contains any number of letters separated by a comma

I think I need some sort of loop!
# 4  
Old 10-29-2006
can you please be more precise?? like which value do yo have to pick. is it the first one the second one or the last one?
# 5  
Old 10-29-2006
One way to do that:
Code:
str1="A,B,C,D,E,F,G,H,I"
count=`echo $str1 | awk -F, '{print NF}'`
i=2
while ((i <= $count));
do
str${i}=`echo $str1 | cut -d, -f${i}`
(( i = i + 1));
done

Another way, using awk arrays:
Code:
str1="A,B,C,D,E,F,G,H,I,J"
echo $str1 | awk -F, '{
for (i =1; i <= NF; i++)
         a[i]=$i;
}'

You can reference array subscript later on to access values.

Regards,
Tayyab
# 6  
Old 10-29-2006
Thanks Tayyab!

I tried your second suggestion but one more stupid question: array a is in awk, how do I reference to it in Shell.

Regards
# 7  
Old 10-29-2006
Code:
eval `echo $str1 | awk -F, '{
for (i =1; i <= NF; i++)
        printf("a[%d]=%s\n",i,$i);
}'`

Use the above code to access array "a" in shell script.
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