Hi,
I'm going over this topic in unix and i'd be glad if someone could explain this bit of script: sed 's/\(abc\)*/xyz/' so the input would be abcabcabc which results in xyz Also how come 'xyz' doesnt repeat 3 times because the input is 'abc' x 3 ?
Thanks in advance,
ymf
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sed 's/string1/string2/'replaces string1 with string2. the 's' signifies the substitution.you are grouping the letters 'abc' i.e. (abc) using \(abc\) using the \ to escape the literal interpretation of the parenthesis.
The asterisk is used to signify one or more occurences of the group 'abc'.
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sed 's/string1/string2/' replaces string1 with string2. the 's' signifies the substitution.
you are grouping the letters 'abc' i.e. (abc) using \(abc\) using the \ to escape the literal interpretation of the parenthesis.
The asterisk is used to signify one or more occurences of the group 'abc'.
It is the reason you are getting a single 'xyz' as the output.
type the same without the asterisk to see the change in output.
Hope it helps!
Yes definitely it all makes sense now,
Thanks alot ! :)
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