sudo HowTo - Linux / Unix Q & A from nixCraft

How to append text to a file when using sudo command on Linux or Unix

last updated May 30, 2017 in BASH Shell, Linux, UNIX

I am trying to add entry to /etc/hosts file using ‘sudo echo '192.168.1.254 router' >> /etc/hosts‘ but getting an error that read as, -bash: /etc/hosts: Permission denied. How do I insert or append text to a file when running sudo command on Linux or Unix-like system?

Google Chrome: Clear or flush the DNS cache

last updated May 28, 2017 in Linux, Mac OS X, UNIX, Windows

I think Google has its own dns caching system. I am getting the same old dns entry in my Google Chrome browser on both Linux and Apple OS X. How do I flush or clear the DNS cache in Google Chrome browser without compete shutting down?

How to run multiple commands in sudo under Linux or Unix

last updated September 9, 2019 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, Suse, Ubuntu Linux, UNIX

I am a new Linux user. How do I run two commands from a bash shell? I need to run apt-get update and apt-get -y upgrade without typing sudo command two times from a command line on Ubuntu Linux AWS cloud server. How can I two commands in sudo ‘command1 && command2’?

How to run sudo command without a password on a Linux or Unix

last updated April 18, 2017 in BASH Shell, CentOS, Debian / Ubuntu, FreeBSD, Linux, Suse, UNIX

I‘m a new Unix system user. How do I use sudo command without a password on a Linux or Unix-like systems? I log in as tom@my-cloud-server-ip and disabled root login for ssh. After login, I need to run some commands as root user. I am the only sysadmin using my server. How do I run or execute sudo command without a password for a user named Tom under Debian/Ubuntu/CentOS Linux cloud server?

nixCraft

nixCraft

Tag: sudo

How to append text to a file when using sudo command on Linux or Unix

Google Chrome: Clear or flush the DNS cache

How to run multiple commands in sudo under Linux or Unix

How to run sudo command without a password on a Linux or Unix

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