But, I failed to update my Postfix RBL settings. # echo 'foo 86400 IN CNAME ' > & rndc reload Failed To Update Postfix RBL Configuration The end result – a few visitors went to /dev/null: # service httpd stop Wrong CNAME DNS EntryĬreated a wrong DNS CNAME entry in zone file. I wanted to shutdown my local Fedora desktop system, but I issued halt on remote server (I was logged into remote box via SSH): (now I use firewall reset script to avoid lockdowns). I had to call remote data center tech to reset firewall settings. After a quick kernel upgrade, I had rebooted the box. I made changes to sshd_config and changed the ssh port number from 22 to 1022, but failed to update firewall rules. I wanted to shutdown VPN interface eth0, but ended up shutting down eth1 while I was logged in via SSH using the ifconfig command: # hostname Public Network Interface Shutdown Within minutes I received an alert message on both mobile and email. Accidentally Changed Hostname and Triggered False AlarmĪccidentally changed the current hostname (I wanted to see current hostname settings) for one of our cluster node. I had sym links for my web server docroot (/home/httpd/http was symlinked to /To save disk space, I ran rm -rf on http directory. Similarly I end up running rsync command and deleted all new files by overwriting files from backup set (now I have switched to rsnapshot)Īgain, I had no backup when I typed the rsync command.

I end up deleting entire backup (note -c switch instead of -x):

I had only one backup copy of my QT project and I just wanted to get a directory called functions. mkzone > /var/named/chroot/etc/nf Destroyed Working Backups with Tar and Rsync (personal backups) I wanted to append a new zone to /var/named/chroot/etc/nf file., but end up running: As root I killed all process, this was our main Oracle db box: On Linux killall command kill processes by name (killall httpd). I just wanted to remove the user account and I end up deleting everything (note -r was activated via the nf): The file /etc/nf was configured to remove the home directory (it was done by previous sysadmin and it was my first day at work) and mail spool of the user to be removed. They say, “Failure is the key to success each mistake teaches us something.” I hope you will learn something from my 10 Linux or Unix command line mistakes as well as the comments posted below by my readers. A list of my 10 UNIX command line mistakes

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