getting a substring from a string

Shell Programming and Scripting
1

hi all,

I am trying to extract SUBSTRINGS out of a string using ksh.

The string is "SAPR3K.FD0.FA.TJ.B0010.T050302"

I tried using
a= `expr substr $stringZ 1 2`
which is giving me a syntax error, donno why??

any ideas why its not working??

I also tried
echo "welcome" | awk '{ print substr( $0, 0, 4 ) }'
which is working but I want to have the resltant substring in a variable and process further.

tanx......

2

what EXACTLY are you trying to extract in the above examples?
pls give sample input and a desired output.

3

Hi, I am trying to get "10" as a variable and "02" as a variable.
i.e. Input string = SAPR3K.FD0.FA.TJ.B0010.T050302
and desired output string lets say v1 = 10 (at 21st position in the string)and v2 = 02(at 29th position)

4

I have n't seen any problem except

a= `expr substr $stringZ 1 2`

change it as

a=`expr substr $stringZ 1 2` # remove the space