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Re: learning perl

rickumali13-Feb-12 7:36

rickumali

13-Feb-12 7:36

I think the best way to learn Perl fast is to write lots of little Perl programs. There's no substitute for writing these little programs.

Make little programs based on the examples that are here:

http://perldoc.perl.org/perlintro.html[^]

Also, look at the tutorials and FAQs as listed here:

http://perldoc.perl.org/perl.html[^]

If you're interested in using books to learn Perl, I highly recommend "the Llama book":

http://shop.oreilly.com/product/9780596001322.do[^]

Finally, if there's one thing that I learned late that I'd recommend learning early, it's learning the Perl debugger.

http://perldoc.perl.org/perldebtut.html[^]

Good luck!

Re: learning perl

GreyHairedGit14-Feb-12 4:10

GreyHairedGit

14-Feb-12 4:10

Dowload a perl distro - install it and type perldoc perlintro and start reading.
Also if you have an aversion to spending money download the following free
book http://www.greglondon.com/iperl/[^
it'll get you going

Re: learning perl

dpminusa14-Feb-12 6:17

dpminusa

14-Feb-12 6:17

Here is how I learn most languages (this may just be me but it seems to work best). I am always impatient and respond to early success as most do.

1. Rapidly scan the online or offline doc to get a feel for it. This helps create a context.
2. Read some short examples written by others. Lookup the commands you don't understand, etc. Run the examples to see what they really do.
3. Pick a limited scope project. I often build a phone book app. This gives me a reference point on some constructs, syntax, pros and cons of the language.
4. Try your target project and learn as you go. Stay away from the more complex constructs at first. Learning them later is great and super productive in some cases, e.g. map.

I have written a lot of Perl over the last 5 years. I often mix bash and Perl (plus some dialog for a simple GUI) to create console apps quickly. I don't find X-Windows necessary most of the time for what I need.

I like bash with its new enhancements. Some things are still a lot easier in Perl. Sometimes using both on a project (assuming it will be used in *nix) is the best.

To me Perl is not a dead language any more than bash is. The are just special purpose languages. If you need a general purpose language then use one. If you try to make a general purpose language special purpose then you may be taking the long way around. Why do that, other than the challenge?

"Courtesy is the product of a mature, disciplined mind ... ridicule is lack of the same - DPM"

Re: learning perl

thomas.michaud17-Feb-12 3:28

thomas.michaud

17-Feb-12 3:28

There is a learning perl book by O'Reilly.

My advice is to skip the first chapter. Read the rest and come back to the first chapter.

Re: learning perl

jschell17-Feb-12 7:28

jschell

17-Feb-12 7:28

Phiri_code wrote:
whats the best way to learn perl fast.

Where "fast" means one day or one month?
And "learn" means that you can maintain existing apps, write a shopping cart application from scratch or just write some simple code?

Perl is significantly different than java. If you have significant experience in java with regexes then that would help in perl since you wouldn't need to relearn all of the rules there. However there is still semantics and libraries that one must learn.

Attention

chubibo0108-Feb-12 22:07

chubibo010

8-Feb-12 22:07

NO CLASSES!

Re: Attention

Luc Pattyn10-Feb-12 1:49

Luc Pattyn

10-Feb-12 1:49

classes[^]

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Fed up by FireFox memory leaks I switched to Opera and now CP doesn't perform its paste magic, so links will not be offered. Sorry.

web service

AndyInUK7-Feb-12 22:52

AndyInUK

7-Feb-12 22:52

Hi,

We are about to tie up with our competitors site. So anyone who is member of that site, can access our site after entering their username and password used in our competitors site.

Would this be a good solution, if we ask them to write a web service that talks to their database member table and we can then communicate to that web service to allow the members to log inn using their existing username and password?

Thanks

modified 8-Feb-12 6:18am.

Re: did that mistake again....

DaveyM697-Feb-12 23:20

DaveyM69

7-Feb-12 23:20

Question fixed by OP~~Wrong forum?~~

Dave

Binging is like googling, it just feels dirtier.
Please take your VB.NET out of our nice case sensitive forum.
Astonish us. Be exceptional. (Pete O'Hanlon)

BTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)

modified 8-Feb-12 10:36am.

Re: did that mistake again....

AndyInUK8-Feb-12 0:14

AndyInUK

8-Feb-12 0:14

oops... lol, sorry it was for lounge.

Sorted now..

Re: did that mistake again....

Luc Pattyn7-Feb-12 23:38

Luc Pattyn

7-Feb-12 23:38

yes, PHP offers the usual for[^] and foreach[^] loop constructs.

Smile | :)

Luc Pattyn [My Articles] Nil Volentibus Arduum

Fed up by FireFox memory leaks I switched to Opera and now CP doesn't perform its paste magic, so links will not be offered. Sorry.

Remote SSH login with user other than root takes ages to login

Faez Shingeri7-Feb-12 18:31

Faez Shingeri

7-Feb-12 18:31

Hi,

Does anybody know why it takes atleast 10 mins to login to the LINUX (RedHat) server with a user other than root...? However root login is instant..!

I tried modifying the sshd_config file and uncommented
Used DNS no

But still no succcess...

Also, new user creation using the useradd xxxx command takes around 10 mins....

Thanks in advance,
Faez

Re: Remote SSH login with user other than root takes ages to login

Albert Holguin7-Feb-12 20:05

Albert Holguin

7-Feb-12 20:05

There may be something wrong there... I don't experience any delays when using ssh. I mostly use Ubuntu though, but still doesn't make sense that it would take that long, there may be some sort of database problem.

Re: Remote SSH login with user other than root takes ages to login

Faez Shingeri7-Feb-12 20:39

Faez Shingeri

7-Feb-12 20:39

Btw.. I am using putty to login... Is it related to network problems...?
I am not able to use ftp command also through the windows 'cmd' as the session expires...

Regards,
Faez

modified 8-Feb-12 4:03am.

Re: Remote SSH login with user other than root takes ages to login

Richard MacCutchan7-Feb-12 22:44

Richard MacCutchan

7-Feb-12 22:44

Sounds like a network issue, I have used Red Hat in the past and never seen such a problem, even logging in from a client that is outside of the server's LAN.

Unrequited desire is character building. OriginalGriff
I'm sitting here giving you a standing ovation - Len Goodman

Re: Remote SSH login with user other than root takes ages to login

markkuk8-Feb-12 1:02

markkuk

8-Feb-12 1:02

Is the server configured[^] to use networked authentication like LDAP, NIS or Winbind?

Re: Remote SSH login with user other than root takes ages to login

Faez Shingeri8-Feb-12 17:53

Faez Shingeri

8-Feb-12 17:53

Its using LDAP authentication..... Below is the ssh log..

CSS

[faez@SJP2VM0185 ~]$ ssh -vvv ranga@SJP2VM0185
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to SJP2VM0185 [10.102.51.77] port 22.
debug1: Connection established.
debug1: identity file /home/faez/.ssh/identity type -1
debug1: identity file /home/faez/.ssh/id_rsa type -1
debug1: identity file /home/faez/.ssh/id_dsa type -1
debug1: loaded 3 keys
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.3
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit: none,zlib@openssh.com
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_init: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_init: found hmac-md5
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug2: dh_gen_key: priv key bits set: 116/256
debug2: bits set: 490/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/faez/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug3: check_host_in_hostfile: filename /home/faez/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug1: Host 'sjp2vm0185' is known and matches the RSA host key.
debug1: Found key in /home/faez/.ssh/known_hosts:1
debug2: bits set: 489/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/faez/.ssh/identity ((nil))
debug2: key: /home/faez/.ssh/id_rsa ((nil))
debug2: key: /home/faez/.ssh/id_dsa ((nil))
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-with-mic,password
debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug3: Trying to reverse map address 10.102.51.77.
debug1: Unspecified GSS failure.  Minor code may provide more information
Unknown code krb5 195

debug1: Unspecified GSS failure.  Minor code may provide more information
Unknown code krb5 195

debug1: Unspecified GSS failure.  Minor code may provide more information
Unknown code krb5 195

debug2: we did not send a packet, disable method
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/faez/.ssh/identity
debug3: no such identity: /home/faez/.ssh/identity
debug1: Trying private key: /home/faez/.ssh/id_rsa
debug3: no such identity: /home/faez/.ssh/id_rsa
debug1: Trying private key: /home/faez/.ssh/id_dsa
debug3: no such identity: /home/faez/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
ranga@sjp2vm0185's password:
debug3: packet_send2: adding 64 (len 59 padlen 5 extra_pad 64)
debug2: we sent a password packet, wait for reply
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Entering interactive session.

********************** HANGS HERE... RESUMES AFTER 10 MINS *********

debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 0
debug3: tty_make_modes: ospeed 38400
debug3: tty_make_modes: ispeed 38400
debug3: tty_make_modes: 1 3
debug3: tty_make_modes: 2 28
debug3: tty_make_modes: 3 127
debug3: tty_make_modes: 4 21
debug3: tty_make_modes: 5 4
debug3: tty_make_modes: 6 0
debug3: tty_make_modes: 7 0
debug3: tty_make_modes: 8 17
debug3: tty_make_modes: 9 19
debug3: tty_make_modes: 10 26
debug3: tty_make_modes: 12 18
debug3: tty_make_modes: 13 23
debug3: tty_make_modes: 14 22
debug3: tty_make_modes: 18 15
debug3: tty_make_modes: 30 0
debug3: tty_make_modes: 31 0
debug3: tty_make_modes: 32 0
debug3: tty_make_modes: 33 0
debug3: tty_make_modes: 34 0
debug3: tty_make_modes: 35 0
debug3: tty_make_modes: 36 1
debug3: tty_make_modes: 37 0
debug3: tty_make_modes: 38 1
debug3: tty_make_modes: 39 0
debug3: tty_make_modes: 40 0
debug3: tty_make_modes: 41 0
debug3: tty_make_modes: 50 1
debug3: tty_make_modes: 51 1
debug3: tty_make_modes: 52 0
debug3: tty_make_modes: 53 1
debug3: tty_make_modes: 54 1
debug3: tty_make_modes: 55 1
debug3: tty_make_modes: 56 0
debug3: tty_make_modes: 57 0
debug3: tty_make_modes: 58 0
debug3: tty_make_modes: 59 1
debug3: tty_make_modes: 60 1
debug3: tty_make_modes: 61 1
debug3: tty_make_modes: 62 0
debug3: tty_make_modes: 70 1
debug3: tty_make_modes: 71 0
debug3: tty_make_modes: 72 1
debug3: tty_make_modes: 73 0
debug3: tty_make_modes: 74 0
debug3: tty_make_modes: 75 0
debug3: tty_make_modes: 90 1
debug3: tty_make_modes: 91 1
debug3: tty_make_modes: 92 0
debug3: tty_make_modes: 93 0
debug1: Sending environment.
debug3: Ignored env HOSTNAME
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env HISTSIZE
debug3: Ignored env SSH_CLIENT
debug3: Ignored env SSH_TTY
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env MAIL
debug3: Ignored env PATH
debug3: Ignored env INPUTRC
debug3: Ignored env PWD
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env SSH_ASKPASS
debug3: Ignored env SHLVL
debug3: Ignored env HOME
debug3: Ignored env LOGNAME
debug3: Ignored env CVS_RSH
debug3: Ignored env SSH_CONNECTION
debug3: Ignored env LESSOPEN
debug3: Ignored env G_BROKEN_FILENAMES
debug3: Ignored env _
debug2: channel 0: request shell confirm 0
debug2: fd 3 setting TCP_NODELAY
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 2097152
Last login: Thu Feb  9 10:20:37 2012 from 10.102.51.77
[ranga@SJP2VM0185 ~]$

Re: Remote SSH login with user other than root takes ages to login

Andrew_Borg9-Feb-12 4:44

Andrew_Borg

9-Feb-12 4:44

Have You Tried Connecting to Your SSH Terminal, with the Debugging Flag?

If Not, Please try Connecting with the Verbose flag and Post the Output (ssh -vvv)

Re: Remote SSH login with user other than root takes ages to login

Albert Holguin10-Feb-12 20:43

Albert Holguin

10-Feb-12 20:43

See this[^]?

fatching problem in list box

Member 86274987-Feb-12 1:26

Member 8627498

7-Feb-12 1:26

if there are 2 list boxes and i want related sub-category of products in 2nd list box, whwreas in 1st list box there are categories of product...
how i will implement this ?

Re: fatching problem in list box

Mohibur Rashid7-Feb-12 16:24

Mohibur Rashid

7-Feb-12 16:24

Simple suggestion, use AJAX

automatic delete database files within an hour

Akon Lang Ni3-Feb-12 20:55

Akon Lang Ni

3-Feb-12 20:55

Anyone can help me with my project... i want to know what is the codes of automatic delete database files/data within an hour using php...because how many tries i do i can't get it...

modified 4-Feb-12 3:02am.

Re: automatic delete database files within an hour

Mohibur Rashid3-Feb-12 22:41

Mohibur Rashid

3-Feb-12 22:41

Dude,

->I cannot Get it either, will tell me, what you mean by automatic?

as well as delete database files and also what does it mean with in an hour?

->What is your actual problem?

Are you failing to delete tables?
Are you failing to detect list of tables?

or what?

I know I am coward since the day I know that fortune favors the brave

Re: automatic delete database files within an hour

AndyInUK7-Feb-12 1:30

AndyInUK

7-Feb-12 1:30

Your question is quite confusing, but what I understood is, you are trying to delete some data from a table-

Here you go -

SQL

DELETE FROM table_name
WHERE some_column = some_value

Re: automatic delete database files within an hour

Akon Lang Ni10-Feb-12 1:18

Akon Lang Ni

10-Feb-12 1:18

thanks!!!

Last Visit: 31-Dec-99 18:00 Last Update: 23-May-24 3:41

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