Can an expert kindly write an efficient Linux ksh script that will strip rows with no numbers from a text file?
Supposing there are three rows that text file called text.txt :
"field1","field2","field3",11,22,33,44
"field1","field2","field3",1,2,3,4
"field1","field2","field3",,,,
The... (5 Replies)
Hi All,
I am new to unix scripting, please help me in solving this assignment..
I have a scenario, as follows:
1. i have a text file(read1.txt) with the following data
sairam,123
kamal,122
etc..
2. I have to write a unix... (6 Replies)
My data is something like as shown below. Out of this i want the details of alarms (ex: 1947147711,1947147081......) and the fields( ex :sw=tacmwafabb9:shelf=1:slot=5-2:pport=2)
Once i have these details separated, i want the count of these excluding the duplicates. What is the best possible way... (7 Replies)
I am looking for a tabbed text editor without a big library like gnome, kde, and gtk, I know about gedit, kate with extensions, geany, and bluefish. I would prefer it to be like gedit and be really light weight. So if anyone knows of a text editor that doesn't require those big libraries please let... (3 Replies)
I have a 2 part question on how to this in unix scripting using kshell or c shell.
I have a file described below:
1st record has 2 fields on it
every other record has 22 fields on it.
Example
ABC, email address
Detail 1
Detail 2
Detail 3
.
.
.
1st question is... (4 Replies)
Good morning all, I have a machine running IRIX and I need to edit a text file on the terminal that is literally thousands of lines. Does anyone know the most efficient way to edit portions of files like these? Obviously simply using the vi command isn't going to work since I get a too many lines... (1 Reply)
Hi Experts,
I am querying backup status results for multiple databases and getting each and every database result in one csv file. so i need to combine all csv files in one excel file with separate tabs. I am not familiar with perl script so i am using shell script.
Could anyone please... (4 Replies)
Discussion started by: ramakrk2
4 Replies
LEARN ABOUT DEBIAN
io::handle::prototype::fallback
IO::Handle::Prototype::Fallback(3pm) User Contributed Perl Documentation IO::Handle::Prototype::Fallback(3pm)NAME
IO::Handle::Prototype::Fallback - Create IO::Handle like objects using a set of callbacks.
SYNOPSIS
my $fh = IO::Handle::Prototype::Fallback->new(
getline => sub {
my $fh = shift;
...
},
);
DESCRIPTION
This class provides a way to define a filehandle based on callbacks.
Fallback implementations are provided to the extent possible based on the provided callbacks, for both writing and reading.
SPECIAL CALLBACKS
This class provides two additional methods on top of IO::Handle, designed to let you implement things with a minimal amount of baggage.
The fallback methods are all best implemented using these, though these can be implemented in terms of Perl's standard methods too.
However, to provide the most consistent semantics, it's better to do this:
IO::Handle::Prototype::Fallback->new(
__read => sub {
shift @array;
},
);
Than this:
IO::Handle::Prototype::Fallback->new(
getline => sub {
shift @array;
},
);
Because the fallback implementation of "getline" implements all of the extra crap you'd need to handle to have a fully featured
implementation.
__read
Return a chunk of data of any size (could use $/ or not, it depends on you, unlike "getline" which probably should respect the value of
$/).
This avoids the annoying "substr" stuff you need to do with "read".
__write $string
Write out a string.
This is like a simplified "print", which can disregard $, and "$" as well as multiple argument forms, and does not have the extra
"substr" annoyance of "write" or "syswrite".
WRAPPING
If you provide a single reading related callback ("__read", "getline" or "read") then your callback will be used to implement all of the
other reading primitives using a string buffer.
These implementations handle $/ in all forms ("undef", ref to number and string), all the funny calling conventions for "read", etc.
FALLBACKS
Any callback that can be defined purely in terms of other callbacks in a way will be added. For instance "getc" can be implemented in terms
of "read", "say" can be implemented in terms of "print", "print" can be implemented in terms of "write", "write" can be implemented in
terms of "print", etc.
None of these require special wrapping and will always be added if their dependencies are present.
GLOB OVERLOADING
When overloaded as a glob a tied handle will be returned. This allows you to use the handle in Perl's IO builtins. For instance:
my $line = <$fh>
will not call the "getline" method natively, but the tied interface arranges for that to happen.
perl v5.10.1 2009-09-29 IO::Handle::Prototype::Fallback(3pm)