awk to combine lines from line with pattern match to a line that ends in a pattern
I am trying to combine lines with these conditions:
1. First line starts with text of "libname VALUE db2 datasrc" where VALUE can be any text.
2. If condition1 is met then continue to combine lines through a line that ends with a semicolon.
3. Ignore case when matching patterns and remove any leading spaces from line when joining.
I have tried to code this using awk or sed without success.
Your code doesn't make an exception for lines containing libname, db2 and datasrc that already end with a semicolon. It doesn't verify that libname is at the start of a line, doesn't verify that db2 is in the 3rd field, and looks for a colon immediately followed by a semicolon (which never appears in your sample input) to end the set of lines being joined.
The awkIGNORECASE variable works in some versions of awk, but it is not in the standards and several standards-conforming versions of awk (including the awk on BSD and OS X systems) do not provide that extension. The code above works with any standards-conforming version of awk, but obviously needs more complicated regular expressions to perform case-insensitive matches.
If you want to try this on a Solaris/SunOS system, change awk to /usr/xgp4/bin/awk or nawk.
I did modify to use IGNORECASE=1 and it handled case differences OK.
I also added the code to be in a loop so it will made the code changes to all code beginning with a given prefix.
Code:
#!/bin/ksh
#Combine lines that start with "libname VALUE db2 datasrc" and does not end in semicolon
for f in pre*; do
awk 'BEGIN{IGNORECASE=1} /libname/&&/DB2/ && $0 !~ /;$/ {
printf("%s ", $0)
j = 1
next
}
j { for(i = 1; i < NF; i++)
printf("%s ", $i)
printf("%s%s", $NF, (j = ($NF !~ /;$/)) ? " " : "\n")
next
}
1' "$f" > fifo &&
mv fifo $f
done
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02-22-2016
