Can anyone explain to me why the first line doesn't work and the second seems to work fine. I am trying to find all occurances of text within a certain column (col 13) that start with the character V, I suppose it sounds simple but I have tried using the following but don't really understand what... (2 Replies)
Hi all,
I can run the following script using nawk..However, I find that teh server dun support nawk.. May I know how to change teh script to use awk such that it will work? Very urgent.. thx!
nawk 'BEGIN {FS=OFS=","}
NR==FNR{arr=$2;next}
$0 !~ "Documentation"{print $0;next} ... (2 Replies)
i'm new to shell scripting and have a problem please help me
in the script i have a nawk block which has a variable count
nawk{
.
.
.
count=count+1
print count
}
now i want to access the value of the count variable outside the awk block,like..
s=`expr count / m`
(m is... (5 Replies)
Hi guys I'm very new to unix and I have to create an awk script that detects webpage addresses from a file/webpage and outputs how many times each webpage was detected.e.g. if my file was:
(Note: The symbol " was added to stop them being created into links)
"www.google.com"... (1 Reply)
Hi guys I'm very new to unix and I have to create an awk script that detects webpage addresses from a file/webpage and outputs how many times each webpage was detected.e.g. if my file was:
www.google.com
www.facebook.com
www.google.com
the output should be:
www.google.com x2... (2 Replies)
Hi everyone,
i am new to unix , so i want to know what is the use of awk and nawk.
because in most of the place this cmds were used.
so, if anyone provied the basic idea of this cmds, it will be much helpfull for me . . ..
Thnks in Advance :) (9 Replies)
Hi Guys,
I am in need of some help; I have an xml message file which contains personal details as shown below:
, message=, message=, message=, message=, message=, message=
I want to use nawk to parse these xml messages but I am new to awk and nawk.
What I want is to get output... (7 Replies)
Hi ! programmers
I have a need of detecting empty field in file
my file looks like this
40.900|-71.600|1.6|20|1|1961|21.00|3.700||1|US|28035|10029370|31
40.900|-71.600|5.7|20|1|1961|21.00|3.700||1|US|28035|10029370|31
40.900|-71.600|7.8|20|1|1961|21.00|3.700||1|US|28035|10029370|31... (7 Replies)
Discussion started by: Dona Clara
7 Replies
LEARN ABOUT OSX
env
Env(3pm) Perl Programmers Reference Guide Env(3pm)NAME
Env - perl module that imports environment variables as scalars or arrays
SYNOPSIS
use Env;
use Env qw(PATH HOME TERM);
use Env qw($SHELL @LD_LIBRARY_PATH);
DESCRIPTION
Perl maintains environment variables in a special hash named %ENV. For when this access method is inconvenient, the Perl module "Env"
allows environment variables to be treated as scalar or array variables.
The "Env::import()" function ties environment variables with suitable names to global Perl variables with the same names. By default it
ties all existing environment variables ("keys %ENV") to scalars. If the "import" function receives arguments, it takes them to be a list
of variables to tie; it's okay if they don't yet exist. The scalar type prefix '$' is inferred for any element of this list not prefixed by
'$' or '@'. Arrays are implemented in terms of "split" and "join", using $Config::Config{path_sep} as the delimiter.
After an environment variable is tied, merely use it like a normal variable. You may access its value
@path = split(/:/, $PATH);
print join("
", @LD_LIBRARY_PATH), "
";
or modify it
$PATH .= ":.";
push @LD_LIBRARY_PATH, $dir;
however you'd like. Bear in mind, however, that each access to a tied array variable requires splitting the environment variable's string
anew.
The code:
use Env qw(@PATH);
push @PATH, '.';
is equivalent to:
use Env qw(PATH);
$PATH .= ":.";
except that if $ENV{PATH} started out empty, the second approach leaves it with the (odd) value "":."", but the first approach leaves it
with ""."".
To remove a tied environment variable from the environment, assign it the undefined value
undef $PATH;
undef @LD_LIBRARY_PATH;
LIMITATIONS
On VMS systems, arrays tied to environment variables are read-only. Attempting to change anything will cause a warning.
AUTHOR
Chip Salzenberg <chip@fin.uucp> and Gregor N. Purdy <gregor@focusresearch.com>
perl v5.16.2 2012-10-11 Env(3pm)