06-18-2013
Awk does not use $ in variable
change $POS to POS
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I have a large csv file that looks like this:
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IFS=$','
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2. Shell Programming and Scripting
Hi All,
I wanted to find 200th field value in delimiter file using awk.?
awk '{print $200}' inputfile
I am getting error message :-
awk: The field 200 must be in the range 0 to 199.
The source line number is 1.
The error context is
{print >>> $200 <<< }
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Hi,
Is there any short method to print from a particular field till another filed using awk?
Example File:
File1
====
1|2|acv|vbc|......|100|342
2|3|afg|nhj|.......|100|346
Expected output:
File2
====
acv|vbc|.....|100
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How do I do the product of nth filed just like sum. For sum I know like
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Using Awk, how can I achieve the following?
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Eg:
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For some reason I am having difficulty performing what should be a fairly easy task. I would like to print lines of a file that have a unique value in the first field. For example, I have a large data-set with the following excerpt:
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My file (the output of an experiment) starts off looking like this,
_____________________________________________________________
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Hi,
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LEARN ABOUT SUSE
ipc::sysv
IPC::SysV(3pm) Perl Programmers Reference Guide IPC::SysV(3pm)
NAME
IPC::SysV - System V IPC constants and system calls
SYNOPSIS
use IPC::SysV qw(IPC_STAT IPC_PRIVATE);
DESCRIPTION
"IPC::SysV" defines and conditionally exports all the constants defined in your system include files which are needed by the SysV IPC
calls. Common ones include
IPC_CREATE IPC_EXCL IPC_NOWAIT IPC_PRIVATE IPC_RMID IPC_SET IPC_STAT
GETVAL SETVAL GETPID GETNCNT GETZCNT GETALL SETALL
SEM_A SEM_R SEM_UNDO
SHM_RDONLY SHM_RND SHMLBA
and auxiliary ones
S_IRUSR S_IWUSR S_IRWXU
S_IRGRP S_IWGRP S_IRWXG
S_IROTH S_IWOTH S_IRWXO
but your system might have more.
ftok( PATH )
ftok( PATH, ID )
Return a key based on PATH and ID, which can be used as a key for "msgget", "semget" and "shmget". See ftok.
If ID is omitted, it defaults to 1. If a single character is given for ID, the numeric value of that character is used.
shmat( ID, ADDR, FLAG )
Attach the shared memory segment identified by ID to the address space of the calling process. See shmat.
ADDR should be "undef" unless you really know what you're doing.
shmdt( ADDR )
Detach the shared memory segment located at the address specified by ADDR from the address space of the calling process. See shmdt.
memread( ADDR, VAR, POS, SIZE )
Reads SIZE bytes from a memory segment at ADDR starting at position POS. VAR must be a variable that will hold the data read. Returns
true if successful, or false if there is an error. memread() taints the variable.
memwrite( ADDR, STRING, POS, SIZE )
Writes SIZE bytes from STRING to a memory segment at ADDR starting at position POS. If STRING is too long, only SIZE bytes are used; if
STRING is too short, nulls are written to fill out SIZE bytes. Returns true if successful, or false if there is an error.
SEE ALSO
IPC::Msg, IPC::Semaphore, IPC::SharedMem, ftok, shmat, shmdt
AUTHORS
Graham Barr <gbarr@pobox.com>, Jarkko Hietaniemi <jhi@iki.fi>, Marcus Holland-Moritz <mhx@cpan.org>
COPYRIGHT
Version 2.x, Copyright (C) 2007, Marcus Holland-Moritz.
Version 1.x, Copyright (c) 1997, Graham Barr.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.12.1 2010-04-26 IPC::SysV(3pm)