the only way I could make sense of why that works is awk prints out whatever line that are between the two patterns, without much directionality.
when pattern2 is found, store the lines but do not print, is that correct?
when pattern1 is found turn on print. But pattern 1 occurs before pattern 2 in the table. So what is it printing? I think awk works its way down the table as it executes the command, so that code doesn't make much logical sense to me. Or does it not work like that?
the only way I could make sense of why that works is awk prints out whatever line that are between the two patterns, without much directionality.
when pattern2 is found, store the lines but do not print, is that correct?
No. See below.
Quote:
when pattern1 is found turn on print.
Yes.
Quote:
But pattern 1 occurs before pattern 2 in the table. So what is it printing? I think awk works its way down the table as it executes the command, so that code doesn't make much logical sense to me. Or does it not work like that?
Please try diving in deeper into awk by reading man pages or other literature. awk in very general terms does the following: execute the BEGIN action (if exists), then read input line after line, and apply the program steps given sequentially to each line. Program steps consist of pattern {action} pairs, in priciple. Whenever a pattern evaluates to TRUE, execute the action. The default action is {print}. So in your case
So, as you can see, by carefully arranging the steps you can tailor the output to your needs.
BTW - you could, of course, append the down-the-line awk processing that you mentioned before into the above awk program...
After much deliberation I can begin to make sense of the code
My final question is, as Awk reads in the first line of input and execute the following commands for the first line
What is the default value of
as it has not been initialised? As it reads the first line of input pattern2 is not matched so
is not executed, then how does Awk evaluate
(no initialised value?) before it goes down to
which will be true?
I did try to dive into manuals and online resources but I read little stuffs here and little stuffs there it is difficult to get a complete picture.
My input looks like this.
# Lot Of CODE Before
AppType_somethinglese=$(cat << EOF
AppType_test1='test-tool/blatest-tool-ear'
AppType_test2='test/blabla-ear'
# Lot Of CODE After
I want to print text betwen 1) _ and = and 2)/ and ' from each line
and exclude lines with "EOF".
Output... (2 Replies)
Hi
I have two lists of patterns named A and B consisting of around 200 entries in each and I want to extract all the sentences from a big text file which match atleast one pattern from both A and B.
For example, pattern list A consists of :
ama
ani
ahum
mari
...
...
and pattern... (1 Reply)
Hi,
I am trying to extract some patterns from a line. The input file is space delimited and i could not use column to get value after "IN" or "OUT" patterns as there could be multiple white spaces before the next digits that i need to print in the output file . I need to print 3 patterns in a... (3 Replies)
Hi,
I need help to match pattern started with "RW" in file 1 and with pattern in $1 in file 2 as follows:-
File 1
BH /TOTAL=466(423); /POSITIVE=300(257); /UNKNOWN=25(25);
BH /F_P=141(141); /F_N=136; /P=4;
CC /TAX=!?; /MAX-R=2;
CC /VER=2;
RW P9610, AR_BSU , T; PAE25, AE_E57... (10 Replies)
Hi,
What is the best approach to grab contents between
Changes
Dependencies
from the following example snippy
Changes in packages about to be updated:
bash-3.2-32.el5_9.1.x86_64
* Thu Jun 27 22:00:00 2013 Roman Rakus <rrakus@redhat.com> - 3.2-32.1
- Fixed a bug that caused... (2 Replies)
Hi ,
I have an issue where I want to parse through the output from a file and I want to grab the nth occurrence of text in between two patterns preferably using awk or sed
! TICKET NBR : 1 !GSI : 102 ! 3100.2.112.1 11/06/2013 15:56:29 ! 3100.2.22.3 98 ! 3100.2.134.2... (8 Replies)
I have a file which contains below kind of lines
2013-05-21 00:00:03 INFO moved to unprocessed, as doesn't exist in masklist and modified at 2013-05-20@21:21:21.000000000.
2013-05-21 00:00:03 INFO moved to unprocessed, as doesn't exist in masklist and modified at... (1 Reply)
I have a list of patterns (regexes) in a file and use with `grep -f <file_with_list_of_regexes.txt> input.txt` to search in my input for those patterns. grep is doing a fantastic job at it and finds me the matching input text but I also want to see in the output the regex (from... (1 Reply)
Hi,
I have a master file that i need to split into multiple files based on matched patterns. sample of my data as follows:-
scaff_1 a e 123 130 c_scaff_100
scaff_1 a e 132 138 c_scaff_101
scaff_1 a e 140 150 ... (2 Replies)
Hi,
I have an array.
@arr=("abcdefgh","ppppppp","rrr");
$tofind="rrr";#string to find.
I want to match this string and retrieve only matched contents.
In this case rrr is found in 2nd position in an array i want to print only rrr.
If the string is matched i have to retrieve only... (1 Reply)