This example shows how you can store the lines in an array. The for loop in the END section loops through the array and prints the lines that match the pattern.
Hi All,
Is there a way to save a range in variable for later printing?
for example write somthing like this:
awk '
/pattern1/,/pattern2/{f=range}
/pattern3/{print f}
'
I don't know excatly what "range" could be but is there a way to do this? (8 Replies)
Hello,
I am obviously quite new to unix and awk. I need to parse certain columns of a file (delimited by spaces), and somehow save the value of this column somewhere, together with the value of the column just after it (by pairs; so something like ).
I'm then supposed to count the times that... (9 Replies)
Hi guys!
I'm new to scripting and I need to write a script in awk.
Here is example of file on which I'm working
ATOM 4688 HG1 PRO A 322 18.080 59.680 137.020 1.00 0.00
ATOM 4689 HG2 PRO A 322 18.850 61.220 137.010 1.00 0.00
ATOM 4690 CD ... (18 Replies)
I have a directory question where I ask the user which entry he wants to delete...
echo "Which entry?"
read entry
sed '/^'$entry'/d' file
This code does in fact delete that particular entry...
HOWEVER, when I go to inquire about that same entry, it still populates like it was never... (4 Replies)
Hello,
I was wondering how is it possible if I use this command:
awk 'NR >= 998 && NR <= 1000' file.txtTo exit after parsing the 1000th line ( last line targeted) ???
I observed that when executing this command for a large file, if the range of lines is at the beginning of the file it is... (2 Replies)
My source file is structured with two words on each line
word1 word2
word1 word2
I am using sed and awk to grab groups of specific lines
line=`awk 'NR>=4 && NR<=7' file1`; echo $line
line=` sed -n '1,5'p file1`; echo $line
The resulting output is
word1 word2 word1 word2 word1... (1 Reply)
Say you want to clear your .bash_history except for the first 25 lines. Try:
sed -i -e 26,500d .bash_historyI have a some frequently-used routines parked in the first few lines, and they kept getting overwritten by more recent commands. (2 Replies)
Perl::Critic::Policy::Variables::RequireNegativeIndices(User Contributed Perl DocumentPerl::Critic::Policy::Variables::RequireNegativeIndices(3pm)NAME
Perl::Critic::Policy::Variables::RequireNegativeIndices - Negative array index should be used.
AFFILIATION
This Policy is part of the core Perl::Critic distribution.
DESCRIPTION
Conway points out that
$arr[$#arr];
$arr[$#arr-1];
$arr[@arr-1];
$arr[@arr-2];
are equivalent to
$arr[-1];
$arr[-2];
$arr[-1];
$arr[-2];
and the latter are more readable, performant and maintainable. The latter is because the programmer no longer needs to keep two variable
names matched.
This policy notices all of the simple forms of the above problem, but does not recognize any of these more complex examples:
$some->[$data_structure]->[$#{$some->[$data_structure]} -1];
my $ref = @arr;
$ref->[$#arr];
CONFIGURATION
This Policy is not configurable except for the standard options.
AUTHOR
Chris Dolan <cdolan@cpan.org>
COPYRIGHT
Copyright (c) 2006-2011 Chris Dolan.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.14.2 2012-06-07 Perl::Critic::Policy::Variables::RequireNegativeIndices(3pm)