Please help on "if" statement.


 
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# 8  
Yes, of course, while it would be far more educative if you found out yourself.

Let's start at the end: awk will look through its parameters for assignments to internal variables, so awk internal variable D will transport the contents of shell var domainlist.
match ($0, D): tries to match $0, the entire line read, against the regular expression in parm 2, here: D. (That's why it's important to have the pipes in domainlist - these are the ors in exended regexes.) It puts the start and the length of the match into resp. vars.
print $0 > filename: redirects output to the given file, in above case the before matched string, your domain member.
*: will be expanded by the shell all the files in the current directory not starting with a dot.
# 9  
Quote:
Originally Posted by chococrunch6
can you please explain what does this awk code do?

Code:
$ awk 'match($0, D){ print $0 > substr ($0,RSTART,RLENGTH)}' D=$domainlist *

Matches d against the entire line, and if it matches, prints the entire line into a file with the name of the matching string.
 

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