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Linux & Unix

How to convert filenames or text to lowercase on the Linux command line

There is no simple 'tolower' command on the bash, but you can convert uppercase characters to lowercase with a little…

How to access a name based website without a DNS record

If you want to access a name-based website that you created e.g. in ISPConfig before the DNS records are set…

[Solved] Postfix: “queue file write error”

If you get an error like: Apr 15 12:41:03 webb4 postfix/sendmail[11234]: fatal: web1_user(12967): queue file write error in your mail…

How to speed up logins in pure-ftpd on Debian or Ubuntu Linux by disabling name resolution

If you experience problems with slow logins in pure-ftpd, this is often caused by a problem with the resolving of…

How to enable verbose logging in pure-ftpd on Debian and Ubuntu

To turn on verbose logging (e.g. to debug FTP connection or authentication problems) in pure-ftpd FTP server on Debian and…

Backup and Restore MySQL Databases on the shell

One way to create a backup of a MySQL database on the shell is to use the mysqldump command. Mysqldump…

Configure fail2ban to use route instead of iptables to block connections

Fail2ban uses iptables by default to block incoming connections when they exceed the max.  login retries. The iptables rules used…

How to Shutdown or Reboot Debian 10 (Buster)

Debian 10 has now fully switched to Systemd which means that the traditional commands to halt or reboot a system…

How to add a newline character when using echo command on Linux

This short guide shows you how to add a newline into a file by using the echo command on the…

Redirect domains without www (e.g. domain.com) to www.domain.com with apache rewrite rules

If all your visitors shall access your website with a URL like www.domain.com and not without www, use the following…

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