Category: Linux and Unix

Hi,
Is there any other option other than OPM to restrict command in linux and nix server.?
I have done through OPM but if OPM is not installed can we done through any other option

im looking for the steps to write a c program which work as the command PS and i know that i should read the information from pseudo file /proc but i dont know how and any simple code to help me understanding that... thanx

I recently installed Linux on my computer to enjoy a more versatile Ruby on Rails programming environment. The computer already had Windows 7 installed. However, I lost the booting path for windows after the installation. Currently, I cannot boot into Windows. Does anyone know how to edit Grub to allow me to choose either of the operating systems at start up?

I have an ereader and I'm trying to upload books to it. Therefore I use the app Calibre. But the "send to device" options all don't allow me to do so. Any users of this app here?

Thanks

I must add: The device is a Kobo Glo

Any body can help me with solving this task:
Write a simple program that creates a pipe forks two processes and then
sends data through the pipe. Use two standard programs such as (who)
and (wc).????

Hello. I'm trying to learn LInux. The book I read states that you should know how to use Vi. What is your opinion about that?

How can I produce supertext in Linux?

edit: The name of this topic should be " produce supertext" in stead of " use supertext" but I think you all get t he point

I am trying to set-up Postfix on my Ubuntu local web development machine for send-only e-mails using Gmail so I can test e-mails sent by a web app I am developing.

These are the steps I have followed based on a recently posted tutorial found here:

1. Dowloaded and installed Postfix using "Internet Site" option
   The FQDN I am using is 'lhdwlamb.com'. This also appears in /etc/hosts . Excerpts of the configuration file where specified edits are needed:

   myhostname = daniel-wsT7500
   alias_maps = hash:/etc/aliases
   alias_database = hash:/etc/aliases
   myorigin = /etc/mailname
   mydestination = $myhostname, lhdwlamb.com, daniel-wsT7500, localhost.localdomain, loc$
   relayhost = [smtp.gmail.com]:587
   mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
   mailbox_size_limit = 0
   recipient_delimiter = +
   inet_interfaces = all
   inet_protocols = all

   #Enable SASL authentication
   smtp_sasl_auth_enable = yes
   smtp_sasl_security_options = noanonymous
   smtp_sasl_password_maps = hash:/etc/postfix/sasl/sasl_passwd
   smtp_tls_security_level = encrypt
   smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

2. Obtained a Google App Password
   This is a step I found missing from several other tutorials I found. For Google account settings 2-step verification is on when using Google App password. I have also tried the old method of my regular gmail password with allow less secure apps turned on.

3. Created as sasl_passwd file

   [smtp.gmail.com]:587 xxxxxxx@gmail.com:xxxxxxxxxxxx

(x's replace actual values for security here)

1. The sasl_passwd file is converted to a db using sudo postmap

2. Files sasl_passwd and sasl_passwd.db changed to root and 0600 as listed:

   ll /etc/postfix/sasl/
   total 12
   -rw------- 1 root root 55 Jan 31 17:06 sasl_passwd
   -rw------- 1 root root 12288 Jan 31 17:09 sasl_passwd.db

3. Postfix was restarted using sudo systemctl restart postfix.

Test e-mails are not receiving by GMail. This is the result I am seeing in mail.log (xxx's for security here):

Jan 31 16:39:51 daniel-wsT7500 postfix/smtp[28260]: E8545E1313: to=<xxxxxxx@gmail.com>, relay=smtp.gmail.com[173.194.205.108]:587, delay=67, delays=65/0.12/1.4/0, dsn=4.7.8, status=deferred (SASL authentication failed; server smtp.gmail.com[173.194.205.108] said: 535-5.7.8 Username and Password not accepted. Learn more at?535 5.7.8  https://support.google.com/mail/?p=BadCredentials o5sm12089476qko.85 - gsmtp)

I have looked at the page for the link in that error message and not found anything to help with this problem.

Can anyone help with information I am missing or other problems to test for?

Thanks for taking the time to read this.

I'm trying to run VirtualBox in Ubuntu. I just created a machine but when I run it I get this error message:

Failed to open a session for the virtual machine Windows7_inLinux_2021_01_30.

VT-x is disabled in the BIOS. (VERR_VMX_MSR_VMXON_DISABLED).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}

Help?

Thanks. Leon

I have a really big problem because I have to call the file with the same name twice and I have this error all the time:

ELF binary type "0" not known.
-bash: ./a.out: cannot execute binary file: Exec format error

https://pastebin.pl/view/6dd51419

I have to write a game for two people like udp so that they are logged in on different machines, and I can't even run a program with the same name in a different terminal ...

Hi
I'm looking for Linux with the best chance to work with touch controls straight out of the box.

I bought Z3735F/2048MB/32GB tablet that doesn't support touch on win 10 at all (it was a "Bing" edition tablet).

Maybe there is sth in linux world that is highly compatible with stuff like that?

What I have tried:

Android x86 - and it's nothing like the mobile expiriance

My php is regularly stopping so I need some idea of database. Can you provide?

I am facing this issue on my Linux server for long time and not able to resolve it.