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  • Using /dev/tcp instead of wget

    - by User1
    Why does this work: exec 3</dev/tcp/www.google.com/80 echo -e "GET / HTTP/1.1\n\n"&3 cat <&3 And this fail: echo -e "GET / HTTP/1.1\n\n" /dev/tcp/www.google.com/80 cat </dev/tcp/www.google.com/80 Is there a way to do it in one-line w/o using wget, curl, or some other library?

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  • How do I insert null fields with Perl's DBD::Pg?

    - by User1
    I have a Perl script inserting data into Postgres according to a pipe delimited text file. Sometimes, a field is null (as expected). However, Perl makes this field into an empty string and the Postgres insert statement fails. Here's a snippet of code: use DBI; #Connect to the database. $dbh=DBI-connect('dbi:Pg:dbname=mydb','mydb','mydb',{AutoCommit=1,RaiseError=1,PrintError=1}); #Prepare an insert. $sth=$dbh-prepare("INSERT INTO mytable (field0,field1) SELECT ?,?"); while (<){ #Remove the whitespace chomp; #Parse the fields. @field=split(/\|/,$_); print "$_\n"; #Do the insert. $sth-execute($field[0],$field[1]); } And if the input is: a|1 b| c|3 EDIT: Use this input instead. a|1|x b||x c|3|x It will fail at b|. DBD::Pg::st execute failed: ERROR: invalid input syntax for integer: "" I just want it to insert a null on field1 instead. Any ideas? EDIT: I simplified the input at the last minute. The old input actually made it work for some reason. So now I changed the input to something that will make the program fail. Also note that field1 is a nullable integer datatype.

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  • descending heap sort

    - by user1
    use heap sort to sort this in descending order and show the steps or explanation please below is the tree 79 33 57 8 25 48 below is the array 79 - 33 - 57 - 8 - 25 - 48 ok ascending is easy because the largest element is at the top we can exchange the last element and the first element and then use heapify as the sample code in wikipedia describes it.

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  • Calculating statistics directly from a CSV file

    - by User1
    I have a transaction log file in CSV format that I want use to run statistics. The log has the following fields: date: Time/date stamp salesperson: The username of the person who closed the sale promo: sum total of items in the sale that were promotions. amount: grand total of the sale I'd like to get the following statistics: salesperson: The username of the salesperson being analyzed. minAmount: The smallest grand total of this salesperson's transaction. avgAmount: The mean grand total.. maxAmount: The largest grand total.. minPromo: The smallest promo amount by the salesperson. avgPromo: The mean promo amount... I'm tempted to build a database structure, import this file, write SQL, and pull out the stats. I don't need anything more from this data than these stats. Is there an easier way? I'm hoping some bash script could make this easy.

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  • Is there a place where I see the popular opinion of developers?

    - by User1
    I really want to know popular opinion on controversial programming topics. Questions like: Why do some people prefer vi over emacs (or vice versa)? Is Java faster than C++? Is Intel faster than AMD? It seems SO discourages such conversions because of potential flamewars. So where do people go to discuss such matters? I'm especially interested in venues where people can "up vote" good comments and good questions.

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  • Converting an int to an IP address

    - by User1
    Is there an easy way to convert an int to an IP address in PostgreSQL? I was able to go from IP to int using this code: SELECT inet '1.2.3.4'-'0.0.0.0' This doesn't work: SELECT 16909060::inet I didn't see anything in the documentation. Does anyone know how to do this?

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  • Prevent Java from parsing the command line parameters

    - by User1
    Would like to make anapplication in Java that will not automatically parse parameters used on the command-line. Currently, java requires public static void main(string[]) as the entry point signature. I would like just a single string that I parse myself. Can this be done at all? Here's an example: java MyProgram.class Hello World I would want it to give me Hello World without requiring quotes around that string. I would even settle for java giving me the entire java MyProgram.class Hello World. I'm thinking this is something beyond Java and has more to do with the shell.

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  • Fork two processes and kill the second when the first is done

    - by User1
    The title says it all. I want to create a bash script that will launch two processes and kill the second process when the first is done. Here's an example: #fork first process producer& #fork second process consumer& #wait for producer to finish ... #kill the consumer ... I have a feeling this can get ugly but has a very simple solution. Please help me fill in the blanks.

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  • Joining two select queries and ordering results

    - by user1
    Basically I'm just unsure as to why this query is failing to execute: (SELECT replies.reply_post, replies.reply_content, replies.reply_date AS d, members.username FROM (replies) AS a INNER JOIN members ON replies.reply_by = members.id) UNION (SELECT posts.post_id, posts.post_title, posts.post_date AS d, members.username FROM (posts) as b WHERE posts.post_set = 0 INNER JOIN members ON posts.post_by = members.id) ORDER BY d DESC LIMIT 5 I'm getting this error: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'a INNER JOIN members ON replies.re' at line 2 All I'm trying to do is select the 5 most recent rows (dates) from these two tables. I've tried Join, union etc and I've seen numerous queries where people have put another query after the FROM statement and that just makes no logical sense to me as to how that works? Am I safe to say that you can join the same table from two different but joined queries? Or am I taking completely the wrong approach, because frankly I can't seem see how this query is failing despite reading the error message. (The two queries on there own work fine)

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  • Convert numbers to enumeration of strings in bash

    - by User1
    Using bash, I have a list of strings that I want to use to replace an int. Here's an example: day1=Monday day2=Tuesday day3=Wednesday day4=Thursday day5=Friday day6=Saturday day7=Sunday If I have an int, $dow, to represent the day of the week, how do I print the actual string? I tried this: echo ${day`echo $dow`} but get error of "bad substitution". How do I make this work? Note: I can change the $day variables to a list or something.

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  • Using an iterator without its container

    - by User1
    I am mixing some C and C++ libraries and have only a single pointer available to do some work in a callback function. All I need to do is iterate through a vector. Here's a simplified, untested example: bool call_back(void* data){ done=... if (!done) cout << *data++ << endl; return done; } Note that this function is in an extern "C" block in C++. call_back will be called until true is returned. I want it to cout the next element each time it's called. data is a pointer to something that I can pass from elsewhere in the code (an iterator in the above example, but can be anything). Something from data will likely be used to calculate done. I see two obvious options to give to data: Have data point to my vector. Have data point to an iterator of my vector. I can't use an iterator without having the .end() method available, right? I can't use a vector alone (unless maybe I start removing its data). I could make a struct with both vector and iterator, but is there a better way? What would you do?

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  • Easy way to keeping angles between -179 and 180 degrees

    - by User1
    Is there an easy way to convert an angle (in degrees) to be between -179 and 180? I'm sure I could use mod (%) and some if statements, but it gets ugly: //Make angle between 0 and 360 angle%=360; //Make angle between -179 and 180 if (angle180) angle-=360; It just seems like there should be a simple math operation that will do both statements at the same time. I may just have to create a static method for the conversion for now.

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  • Is JDEE worth using?

    - by User1
    I see many nice feature of JDEE in Emacs. However installation seems to be a bit involved, especially in Windows so I want to see if others found it useful. I use Eclipse and NetBeans and there are some decent features to these products. However, I really like the idea of a scripted language like Lisp built into my IDE so I can change most features on-the-fly. So I want to give JDEE a shot, but I've heard from more than one advanced Emacs user that they don't even need JDEE. I wonder if those people even tried JDEE or if they are just doing simple Java projects. Has anyone tried JDEE and liked it? Are there features in Emacs that make JDEE fairly pointless? Please no "try Eclipse" comments..I have used it and it has nice features, but I want to give Emacs a fair shot. UPDATE: See my accepted answer. I tried JDEE for a while but gave it up for eclipse and have never looked back. Happily ever after.

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  • postfix cannot getting my domain name?

    - by Kossel
    Hi I'm trying to setup webmin+postfix+dovecot+roundcube, for this moment I want things be as simple as possible so I'm using linux users as email accounts. I can send/receive from the same domain, I mean [email protected] can send/receive to/from [email protected] I tested smtp/imap with outlook and says no problem. if I send a mail from gmail it reject with error of: Technical details of temporary failure: The recipient server did not accept our requests to connect. when I login with roundcube the email address display in the right corner is something like user1@com and I get this error message from logs: [11-Nov-2012 07:39:03 +0400]: IMAP Error: Login failed for user1 from 187.150.xx.xx. Could not connect to com:143: php_network_getaddresses: getaddrinfo failed: Name or service not known in /var/www/webmail/program/include/rcube_imap.php on line 191 (POST /webmail/?_task=login&_action=login) it says Could not connect to com:143 looks like it cannot read the domain name. I used http://mxtoolbox.com/ to check the mx record and it says it can find the server of mail.mydomain.com. I quit sure the problema is from postfix or my server configs, but I have been looking for every config file and cannot find the answer of this. any suggestion I will appreciate. here are some of my configs (I don't want to make this question too long, I can provide any other information to solve this question): postfix main.cf #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_sasl_security_options = noanonymous smtpd_sasl_auth_enable = yes smtpd_sasl_type = dovecot smtpd_sasl_path = private/auth # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. mydomain = mydomain.com myhostname = mail.mydomain.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases mydestination = $mydomain, $myhostname mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 recipient_delimiter = + virtual_alias_domains = mydomain.com smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination permit_sasl_authenticated myorigin = $mydomain roundcube conf // ---------------------------------- // IMAP // ---------------------------------- $rcmail_config['default_host'] = '%d'; $rcmail_config['default_port'] = 143; $rcmail_config['imap_auth_type'] = null; $rcmail_config['imap_delimiter'] = null; $rcmail_config['imap_ns_personal'] = null; $rcmail_config['imap_ns_other'] = null; $rcmail_config['imap_ns_shared'] = null; $rcmail_config['imap_force_caps'] = false; $rcmail_config['imap_force_lsub'] = false; $rcmail_config['imap_force_ns'] = false; $rcmail_config['imap_timeout'] = 0; $rcmail_config['imap_auth_cid'] = null; $rcmail_config['imap_auth_pw'] = null; $rcmail_config['imap_cache'] = null; $rcmail_config['messages_cache'] = false;

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  • LDAP Structure: dc=example,dc=com vs o=Example

    - by PAS
    I am relatively new to LDAP, and have seen two types of examples of how to set up your structure. One method is to have the base being: dc=example,dc=com while other examples have the base being o=Example. Continuing along, you can have a group looking like: dn: cn=team,ou=Group,dc=example,dc=com cn: team objectClass: posixGroup memberUid: user1 memberUid: user2 ... or using the "O" style: dn: cn=team, o=Example objectClass: posixGroup memberUid: user1 memberUid: user2 My questions are: Are there any best practices that dictate using one method over the other? Is it just a matter of preference which style you use? Are there any advantages to using one over the other? Is one method the old style, and one the new-and-improved version? So far, I have gone with the dc=example,dc=com style. Any advice the community could give on the matter would be greatly appreciated.

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  • Set Windows 7 Default Login to a Non Domain Account

    - by Joe Taylor
    We have 12 Laptop Pc's that we have upgraded from Windows XP to Windows 7. The laptops are used by staff on away days. They log on to a local account on the machine - say User1 with no password. On the Windows XP Login screen there was a drop down menu allowing them to log on to the Local Machine. However in Windows7 there is no such box and it is confusing staff. Windows 7 tries to log into the domain by default, it doesn't seem to remember where the user last logged into. Is there a way to set Windows7 to log on to the local machine by default instead of the domain? I do not want the staff to have to type for example stafflaptop1\User1 when they log on.

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  • Set Windows 7 Default Login to a Non Domain Account

    - by Joe Taylor
    We have 12 Laptop Pc's that we have upgraded from Windows XP to Windows 7. The laptops are used by staff on away days. They log on to a local account on the machine - say User1 with no password. On the Windows XP Login screen there was a drop down menu allowing them to log on to the Local Machine. However in Windows7 there is no such box and it is confusing staff. Windows 7 tries to log into the domain by default, it doesn't seem to remember where the user last logged into. Is there a way to set Windows7 to log on to the local machine by default instead of the domain? I do not want the staff to have to type for example stafflaptop1\User1 when they log on.

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  • Is that possible to route all mails sent to a mailbox to another server's mailbox

    - by Chau Chee Yang
    I have a Linux server that has local mail service. There are few user accounts on this server. User may send the mail to each other but that only restrict to LAN environment only. For example, I may # mail user1 to send mail to user1. User are not able to send mail to public. Some service like hylafax using this local mail service to send notification of fax status. I don't want to manage and maintain local mail service anymore. I have subscribed a package from ISP to host a public domain of my own. I wish to have my hylafax service to able to send the notification mails to public mail server, is that possible to do it? It is great if all mails that send to local mail server may forward to public mail server. That makes the local mail service serve mail forward only.

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  • If I change Windows admin user password, then I can't login to Outlook, why?

    - by Tom
    I am seeing this strange behaviour with Windows 7 and Outlook 2010. If I change the password of User1 (Admin user), login, and start Outlook, it asks for the pasword. It keeps saying "password incorrect". I can login by using same password on the webclient. If I change User1's password back to last one, Outlook starts without any prompting and I'm able to send and receive emails. Is there any link between the user account, its password and the PST file's password?

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  • How to make security group in one forest show up in another forest?

    - by Jake
    I have two Win2k8 forests which I do maintenance on. The two forests have full 2 way external, non transitive trust with each other. I have a folder in forest X, domain countryX.mycompany.com accessible ONLY by the global security group named $group. In forest Y, domain countryY.mycompany.com, countryY\user1, countryY\user2 etc needs to have access to the folder. The natural instinct is to put user1, user2 etc into the $group. However, none of the methods for adding user to group works as it appears that the AD cannot find the groups in the other forest. Question: 1.How to make forests see each other's security groups and be able to add? 2.In practice, what is the recommended way to achieve the user access to the folders/files in another forest?

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  • Duplicate pseudo terminals in linux

    - by bobtheowl2
    On a redhat box [ Red Hat Enterprise Linux AS release 4 (Nahant Update 3) ] Frequently we notice two people being assigned to the same pseudo terminal. For example: $who am i user1 pts/4 Dec 29 08:38 (localhost:13.0) user2 pts/4 Dec 29 09:43 (199.xxx.xxx.xxx) $who -m user1 pts/4 Dec 29 08:38 (localhost:13.0) user2 pts/4 Dec 29 09:43 (199.xxx.xxx.xxx) $whoami user2 This causes problems in a script because "who am i" returns two rows. I know there are differences between the two commands, and obviously we can change the script to fix the problem. But it still bothers me that two users are being returned with the same terminal. We suspect it may be related to dead sessions. Can anyone explain why two (non-unique) pts number are being assigned and/or how that can be prevented in the future?

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  • svn diff including annotate/blame-alike information of when changes where made by who

    - by Wouter Coekaerts
    Can you add annotate/blame-alike information to svn diff, so that for every changed line it includes which user and revision changed that line? For example, an annotate-diff comparing revisions 8-10 could output something like: 9 user1 - some line that user1 deleted in revision 9 10 user2 + some line that user2 added in revision 10 The context, lines around it which haven't changed, may be included as well or not, doesn't matter. It's not just a matter of "quickly" writing a shell script combining the output of svn diff and svn annotate. annotate for example will never show you who removed a line. It's also not a matter of doing annotate on a revision in the past: We're not interested in who originally added the line that got removed (that's not the one who "caused" the diff), we want to know who removed it. I suspect the only way to implement something to do this is to inspect each and every commit between the two revisions being compared (and somehow map all the changes in the separate diffs to lines in the total diff)... Does there exist a tool that does something like that?

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  • Apache suEXEC execute script on user dir basis?

    - by Blame
    Iam looking for a way to run a script with different users. I dont want to hardcode the users in the config... and I found some information that it should be possible that the user goes to... lets say: Code: http://localhost/~user1/myscript.cgi and the script gets executes as user 'user1'. Does anybody know if that is possible? If not, do I have to make a new vhost config for every user? Thanks a lot! Greets, Kodak

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