VIKHOST Tech Blog
Useful Technical Articles, Notes and Instructions.

How to find out the external ip in Linux

How to find out the external ip in Linux — If you need to find out external IP from Linux command line, you need to do one of next commands: How to find out the Public IP Address from the Linux Command Line You need to get external IP address using command curl: # curl ifconfig.me
# curl ip.appspot.com
# curl icanhazip.com How to get external IP using command wget: # wget -q -O - ifconfig.me
# wget -q -O - ip.appspot.com
# wget -q -O - icanhazip.com How to find out external IP Address using DynDNS.org 1. You can ...
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Generating Random Passwords from the Command Line in Linux

Generating Random Passwords from the Command Line in Linux — You can use next command for generating random password in command line: # tr -dc A-Za-z0-9 < /dev/urandom | head -c 8 | xargs Password example: 4fFUND1d Also you can use next bash function (add it to yuor ~/.bashrc): Random Password Generator genpasswd() {
tr -dc A-Za-z0-9 < /dev/urandom | head -c ${1:-8} | xargs
} Reboot .bashrc: $ . ~/.bashrc Now use genpasswd to generate random passwords: $ genpasswd
vmuWt7TS
$ genpasswd 10
ymkIgxcdCh
$ genpasswd 16
wQnqgdc5tAQoiBdf ...
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How to Clear BASH History in Linux, Centos, Debian and Ubuntu

How to Clear BASH History in Linux, Centos, Debian and Ubuntu — If you don’t want to save history in Bash, since the commands may contain data such as passwords. This article will help keep Bash history in check. How to completely delete the Bash history: -c - Clear history file -w - add commands of the current session to the history file # history –cw How to remove a specific line from the Bash history: -d - Delete the line with the specified number from the history # history -dw 352 How to clear command history of current session: ...
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How To Clear or Remove Linux Logins History

How To Clear or Remove Linux Logins History — On Linux systems, there are three standard commands that show information about the most recently connected users: last, lastb and lastlog. The output of these commands includes: login, time of last connection , IP address, port, etc. To preserve anonymity, it is necessary to clear the history of recent connections.
Command Log Description last /var/log/wtmp Lists successful login/logout history lastb /var/log/btmp History of failed login attempts lastlog var/log/lastlog List of the last connected users To remove all the information about the last logged in users, you need to clear the logs: ...
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