Actually the error is the unquoted $. Just try it from an interactive shell:
Single quotes are best for such things unless you expect to expand a variable.
Then you should always quote expansions.
$ret now contains two lines. Can you operate with that, or will you need a for-loop?
If you need more help, please say which shell you're programming for.
using grep, i have a file emp.lst, and i want all those records
where "S" or "s" (capital or small) is not there
i used this
grep emp.lst
when i use grep emp.lst
i am getting rows with S..but why negate (^) is not working? (3 Replies)
<record>
<set>
<termId>1234</termId>
<termType>First</termType>
</set>
<set>
<termId>5678</termId>
<termType>Second</termType>
</set>
</record>
This is saved in record.xml
Hi
I have this sample XML that i am grepping using a shell program.
The objective of the task is - based... (7 Replies)
The below command is not working
stackmem="$(pmap $1 | grep -i '' | awk '{print $2}'| tr -d ' K')"
I need to grep strictly for ---->
Regards,
Mohtashim (2 Replies)
more Hello.txt
it was a sunny way and i was about to go home.
I need to grep and redirect to a new file all the text between 'sunny' and 'go' string above.
Note: There may be multiple lines in between the string i need to grep between. If there are multiple 'go' strings it should grep till... (9 Replies)
i have following pattern in file
s6:s2
s2:s4
s1:s2:s3:s4:s5:s6
s1
.
.
Now i want to find occurence of each record in file like s6:s2 occurs twice {once in first record and both occur in 3 record as well}
so output should be
s6:s2 2
s2:s4 2
s1:s2:s3:s4:s5:s6 :1
s1 : 2
... (7 Replies)
Hi Guys,
I am new to shell scripting. Need help on grep command. I had a file called file.log which contain below statements.
12 Nov 2013 14:12:17,756 INFO security - Userid: raja, Saved File Instance, Name: , Registry:
23 Nov 2013 14:14:11,777 INFO security - Userid: raja, Saved... (7 Replies)
HI,
I have a command to check a license file.
License_print.
In that file you get the headlines and all different licenses.
Now i want to have things extracted from it.
so i do like following:
license_print | grep -iw -e "user" -e "admin"
But i donīt want all lines where user is... (11 Replies)
Hello, I have an input file that looks like so:
LDLR
LDLRAD4
VLDLR
when I grep "LDLR" I get an output of:
LDLR
LDLRAD4
VLDLR
Since all names have "LDLR" included within them, but all I want the output to be is
LDLR
I know it can work if I surround the words with pipes for... (5 Replies)
Hi guys,
Hope someone can help me with this - I'm sure it's fairly simple but it's driving me mad! (forgive the coding - still new on scripting - come from Windows)
I have the following coding for checking whether I want to include a line in a file:-
EXTRACT_Date=$(date --date="${PERIOD}"... (6 Replies)
Discussion started by: NickF
6 Replies
LEARN ABOUT DEBIAN
poe::filter::grep
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)