topic Re: Remving the 1st letter of word in perl in Operating System - HP-UX

Remving the 1st letter of word in perl

paabhi — Wed, 10 Nov 2010 10:52:57 GMT

Hi All,

In one of the sections in my perl script, I need to remove the 1st character of a word and store in an array.The details are ,

The original script was ,

if ( ! defined $inq{$node}{"dmx"} ) {
print "INFO: Collecting inq disk information for DMX array on $node.\n";
$command="/opt/admin/bin/inq -sym_wwn -nodots |grep dsk";
my @clarinq;
($rcode, @clarinq) = execute_command($node, $command, "root");
#print Dumper @clarinq;
my ($ldev, $disk, $diskdevice, $line);
foreach $line (@clarinq) {
($diskdevice, $junk, $ldev, $junk) = split (/\s+/, $line);
($junk, $junk, $junk, $disk) = split (/\//, $diskdevice);
#print "disk is $disk, ldev is $ldev\n";
$inq{$node}{"dmx"}{$disk}=$ldev;
}
}

The o/p of /opt/admin/bin/inq -sym_wwn -nodots |grep dsk is in the format,

# /opt/admin/bin/inq -sym_wwn -nodots |grep dsk
/dev/rdsk/c25t0d0 000290103691 1C4D 60060480000290103691533031433444

The 3rd column is storing to "ldev".

In the new servers, the above inq command is not workin.We have the new command and the o/p of that command is in the format is,

$ pbrun /opt/admin/bin/inq.HPUXIA64 -sym_wwn -nodots|grep disk|grep -v HP |more
/dev/rdisk/disk8 000290103691 0237A 60060480000290103691533032333741

The 3rd column is of 5 digit and I want to remvoe the 1st character so that it will be in the same format as that of old servers.

I have tried this way.....
if ( ! defined $inq{$node}{"dmx"} ) {
print "INFO: Collecting inq disk information for DMX array on $node.\n";
$command="/opt/admin/bin/inq.HPUXIA64 -sym_wwn -nodots|grep disk|grep -v HP";
my @clarinq;
($rcode, @clarinq) = execute_command($node, $command, "root");
#print Dumper @clarinq;
my ($ldev, $disk, $ldev1, $diskdevice, $line);
foreach $line (@clarinq) {
($diskdevice, $junk, $ldev1, $junk) = split (/\s+/, $line);
($junk, $junk, $junk, $disk) = split (/\//, $diskdevice);
($junk, $ldev, $ldev, $ldev, $ldev) =split (/c/, $ldev1);=> This is not taking
#print "disk is $disk, ldev is $ldev\n";
$inq{$node}{"dmx"}{$disk}=$ldev;
}
}

Please could any one help me .

Ahilash

Re: Remving the 1st letter of word in perl

Hein van den Heuvel — Wed, 10 Nov 2010 13:23:30 GMT

Ahilash,

Thanks for a well presented problem.
The new device names are for the new 'agile', access path independent name.

If there is a 5th digit, it might be needed at some point in time... you realize that right?

anyway, i would suggest that instead of the repeat split you look for patterns instead.

You want
$1) the part after the last part in the first word
$2) the last 4 hex-characters in the 3rd word. An optional leading char

Using your 2 examples i van get that with:

$ perl -ne 'print qq($1 $2\n) if /^.*?(\/\w+)\s+\w+\s+.?([0-9A-F]{4})\s/' x.x
/c25t0d0 1C4D
/disk8 237A
^.*?(\/\w+)\s+ = remember last part of first word
\w+\s+ = second word
.?([0-9A-F]{4})\s = remember 4 chars in range, followed by whitespace, with optional '?' anything char.

In your code that can be used as:

if (/^.*?(\/\w+)\s+\w+\s+.?([0-9A-F]{4})\s/) {
$disk = $1;
$ldev = $2;
:

Good luck!
Hein

Re: Remving the 1st letter of word in perl

James R. Ferguson — Wed, 10 Nov 2010 13:32:51 GMT

Hi:

> The 3rd column is of 5 digit and I want to remvoe the 1st character so that it will be in the same format as that of old servers.

If I understand correctly, you want lines like:

/dev/rdisk/disk8 000290103691 0237A 60060480000290103691533032333741

...changed to:

/dev/rdisk/disk8 000290103691 237A 60060480000290103691533032333741

For this, you could do:

# X="/dev/rdisk/disk8 000290103691 0237A 60060480000290103691533032333741"
# echo $X|perl -pe 's/(.+?\s)(.+?\s).(....)/$1$2$3/'

By the way, instead of doing:

# ($junk, $junk, $junk, $disk) = split (/\//, $diskdevice)

...use an array slice and do:

# $disk = (split /\//, $diskdevice)[3];

Regards!

...JRF...

Re: Remving the 1st letter of word in perl

Hein van den Heuvel — Wed, 10 Nov 2010 13:50:25 GMT

my typos:

part after the last part --> part after the last slash
i van --> I can

Your subject line indicated...

>> Remving the 1st letter of word in perl

Fortunately the body of the topic explained clearly what the real problem was that you were trying to solve.... retain the last 4 :-)

If one comes looking here for either those questions, then here is one of many ways how to do that.

remove first: $x =~ s/.//;
retain last 4: $y =~ s/.*(....)/$1/

In a working example:

$ perl -e '$x = $y = q(abcdefgh); $x =~ s/.//; $y =~ s/.*(....)/$1/; print qq($x $y\n)'

Other common ways to solve this and similar problems is to use the SUBSTR function, perhaps with the help of LENGTH to find where to start/end.

Hein