Zazzybob, Thanks for your reply. It would be great if you please explain me the arguments of substr function. I could not find in man pages.
Regds
asutoshch
s is the string you want to perform the substr operation on i is the first character that you want to extract n is the last character you want to match
So if you said substr( "hello", 2, 4 ) it would match the second, third and fourth character and return ell.
Let me explain the code I gave
In the above example, the first argument to substr is $0 (which in this case is the text piped to it - "$0" is the entire record). The second argument is 0 (I could also have used 1) because I want to match from the start of the string. I want to grab the first four characters, so the third argument is 4.
The above code also makes use length(string) command to return the number of characters in the string.
So here, I'm saying "return the substring from the first character (which is the length of the string minus 3), up until the very end of the string".
To clarify this:
So in our substr, we grab from character 4 to character 7 inclusive, which are chars 4,5,6,7 - the last 4 chars.
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