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How to delete blank line/s before and after a search pattern?

 
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# 5  
Old 03-24-2016
Hi newbie_01,
I'm not as fluent in perl as Aia, but the following awk script seems to do what you want:
Code:
awk '
BEGIN {	bpat = "^[[:blank:]]*$"
	cpat = "^[cC][rR][eE][aA][tT][eE] "
	corpat = cpat "[oO][rR] [rR][eE][pP][lL][aA][cC][eE] "
	rpat = "[rR][eE][uU][sS][eE] [sS][eE][tT][tT][iI][nN][gG][sS] "
}
$0 ~ bpat && dblank {
	next
}
$0 ~ bpat {
	savedblanks = savedblanks $0 "\n"
	next
}
$0 ~ rpat {
	dblank = 1
	savedblanks = ""
	print
	next
}
{	dblank = 0
	if(savedblanks != "") {
		printf("%s", savedblanks)
		savedblanks = ""
	}
	if($0 !~ corpat)
		sub(cpat, "CREATE or REPLACE ")
}
1
END {	if(savedblanks != "")
		printf("%s", savedblanks)
}' x.txt

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk (nawk won't correctly process this script).
This User Gave Thanks to Don Cragun For This Post:
newbie_01
 
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