You can do it in sed (which is probably faster than PERL) with the following algorithm: collect all lines, starting from the beginning of a block to and ending with the end of a block, in a buffer. Then print only the blocks which contain the search string and clear the buffer then, regardless of it being printed or not:
Code:
sed -n '/\*\*\*SNMP-ST\*\*\*/,/\*\*\*SNMP-END\*\*\*/N
/\*\*\*SNMP-END\*\*\*/ {
/IP *= *1\.1\.1\.1\./p
d
}' /path/to/infile
After looking at it again having gotten a portion of nights sleep, i notice this will only work in some special circumstances:
Any line starting with the designated start line and ending with the designated end line (i will call such a portion a "paragraph" in the following) will trigger the reading of the next line in the first rule, which means that all lines of the paragraph in question plus the first line of the next one are being read.
If two paragraphs to be printed lie adjacent the first set of rule 1 triggering will consume the starting line of the second paragraph and the second paragraph will therefore never get printed.
So, here the revised version, which should work:
Code:
sed -n '/\*\*\*SNMP-ST\*\*\*/,/\*\*\*SNMP-END\*\*\*/ {
/\*\*\*SNMP-ST\*\*\*/ {
h
d
}
/\*\*\*SNMP-END\*\*\*/!H
}
/\*\*\*SNMP-END\*\*\*/ {
x
G
/IP *= *1\.1\.1\.1/p
d
}' /path/to/input
The first range catches possible paragraphs. The first rule inside this range makes start lines trigger clearing the hold space, all other lines, except for the last in the paragraph add to the hold space content.
The second rule triggers when the last line is reached. Right now there all lines save for the last one in the hold space and the last one in the pattern space. Pattern and hold space are exchanged and the hold space (now only the last line) is appended to the pattern space. This makes the whole paragraph available in pattern space.
The next rule simply decides if it is printed or not, then the pattern is discarded and the next cycle starts. The leftover in the hold space is taken care by the next triggering of the first rule.
I also removed a superfluous trailing dot in the rule deciding the printing.
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