string manipulation

hai1973 · #1 (**permalink**) 10-29-2006

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!

tayyabq8 · #2 (**permalink**) 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.

hai1973 · #3 (**permalink**) 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!

ahmedwaseem2000 · #4 (**permalink**) 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?

tayyabq8 · #5 (**permalink**) 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

hai1973 · #6 (**permalink**) 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

anbu23 · #7 (**permalink**) 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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