10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
My grep returns a row of data like this:
75=20130130;60=074338;61=985;511=55473883;452=115439;62=196;267=1;
Is there a way for the grep to only return 60="something" and 511="something" ?
Thanks in advance. (10 Replies)
Discussion started by: Carl2013
10 Replies
2. UNIX for Dummies Questions & Answers
Hello all,
I'm trying to grep the string "scott" from all files whose names are like srvr*.log and that were created "Nov 15"...I'm trying the following command but throws an error message...seems like the syntax is incorrect..
grep scott < ls -l srvr*.log|grep "Nov 15"
Thanks for your... (9 Replies)
Discussion started by: luft
9 Replies
3. Shell Programming and Scripting
is there anyway i can ask grep to only get the first line?
as in the top command line
line 1 <-- just grep this line
line 2
line 3
---------- Post updated at 04:24 PM ---------- Previous update was at 04:19 PM ----------
nvm.. found out that i can do it with
|head (12 Replies)
Discussion started by: Nick1097
12 Replies
4. Shell Programming and Scripting
can anyone tell me what the \/$ means? from
grep \/$ (8 Replies)
Discussion started by: Nick1097
8 Replies
5. Shell Programming and Scripting
i have files with "DOMAINSOLVER ACMS" with any number of spaces in between the two words on its own line and i can find it with the following:
grep -c "DOMAINSOLVER* ACMS" $FILENAMEbut i need to exclude any lines matching: "$DOMAINSOLVER". i've tried a variety of quoting and escaping with no luck.... (4 Replies)
Discussion started by: crimso
4 Replies
6. Shell Programming and Scripting
Hello,
Is there a way in grep to remember patterns?
For eg: int a,b,c,d,a;
If a variable is declared twice, like in the previous example, I should be able to print only those lines.
Is there a way to print only the lines where the variable name occurs more than once, using grep... (1 Reply)
Discussion started by: prasanna1157
1 Replies
7. UNIX for Dummies Questions & Answers
Instead of using the following command
#dmesg | grep -v sendmail | grep -v xntpd
How can I use just one grep -v and give both arguments.
Please suggest
thanks (4 Replies)
Discussion started by: Tirmazi
4 Replies
8. Shell Programming and Scripting
hello people,
All my servers have 4 mounts with this norme. For example, if my hostname is siroe.
df -h | grep `hostname`
/dev/dsk/c1t3d0s6 404G 399G 800M 100% /siroe3
/dev/dsk/c1t2d0s6 404G 399G 800M 100% /siroe2
/dev/md/dsk/d6 20G 812M 19G ... (3 Replies)
Discussion started by: melanie_pfefer
3 Replies
9. UNIX for Dummies Questions & Answers
Hello Everybody,
I have files; yyyymmdd.log which the data look like this;
"Txid=9426043&MsgTxt=Thankyou&UserId=john&Password=jh2501"
"Txid=9426150&MsgTxt=Thankyou&UserId=john&Password=jh2501"
.
.
.
"Txid=9426200&MsgTxt=Thankyou&UserId=john&Password=jh2501"
Question 1:
How to... (3 Replies)
Discussion started by: nazri76
3 Replies
10. UNIX for Dummies Questions & Answers
what is the format for grep if I want to search from the current directory and through all its subdirectories?:) (3 Replies)
Discussion started by: pkappaz
3 Replies
POE::Filter::Grep(3pm) User Contributed Perl Documentation POE::Filter::Grep(3pm)
NAME
POE::Filter::Grep - select or remove items based on simple rules
SYNOPSIS
#!perl
use POE qw(
Wheel::FollowTail
Filter::Line Filter::Grep Filter::Stackable
);
POE::Session->create(
inline_states => {
_start => sub {
my $parse_input_as_lines = POE::Filter::Line->new();
my $select_sudo_log_lines = POE::Filter::Grep->new(
Put => sub { 1 },
Get => sub {
my $input = shift;
return $input =~ /sudo[d+]/i;
},
);
my $filter_stack = POE::Filter::Stackable->new(
Filters => [
$parse_input_as_lines, # first on get, last on put
$select_sudo_log_lines, # first on put, last on get
]
);
$_[HEAP]{tailor} = POE::Wheel::FollowTail->new(
Filename => "/var/log/system.log",
InputEvent => "got_log_line",
Filter => $filter_stack,
);
},
got_log_line => sub {
print "Log: $_[ARG0]
";
}
}
);
POE::Kernel->run();
exit;
DESCRIPTION
POE::Filter::Grep selects or removes items based on simple tests. It may be used to filter input, output, or both. This filter is named
and modeled after Perl's built-in grep() function.
POE::Filter::Grep is designed to be combined with other filters through POE::Filter::Stackable. In the "SYNOPSIS" example, a filter stack
is created to parse logs as lines and remove all entries that don't pertain to a sudo process. (Or if your glass is half full, the stack
only selects entries that DO mention sudo.)
PUBLIC FILTER METHODS
In addition to the usual POE::Filter methods, POE::Filter::Grep also supports the following.
new
new() constructs a new POE::Filter::Grep object. It must either be called with a single Code parameter, or both a Put and a Get parameter.
The values for Code, Put, and Get are code references that, when invoked, return true to select an item or false to reject it. A Code
function will be used for both input and output, while Get and Put functions allow input and output to be filtered in different ways. The
item in question will be passed as the function's sole parameter.
sub reject_bidoofs {
my $pokemon = shift;
return 1 if $pokemon ne "bidoof";
return;
}
my $gotta_catch_nearly_all = POE::Filter::Grep->new(
Code => &reject_bidoofs,
);
Enforce read-only behavior:
my $read_only = POE::Filter::Grep->new(
Get => sub { 1 },
Put => sub { 0 },
);
modify
modify() changes a POE::Filter::Grep object's behavior at run-time. It accepts the same parameters as new(), and it replaces the existing
tests with new ones.
# Don't give away our Dialgas.
$gotta_catch_nearly_all->modify(
Get => sub { 1 },
Put => sub { return shift() ne "dialga" },
);
SEE ALSO
POE::Filter for more information about filters in general.
POE::Filter::Stackable for more details on stacking filters.
BUGS
None known.
AUTHORS & COPYRIGHTS
The Grep filter was contributed by Dieter Pearcey. Documentation is provided by Rocco Caputo.
Please see the POE manpage for more information about authors and contributors.
perl v5.14.2 2012-05-15 POE::Filter::Grep(3pm)