#Chef passwordless sudo working ubuntu full#

visudo(8) warns that configuring visudo to honor the user environment variables for their editor of choice may be a security hole, since it allows the user with visudo privileges to run arbitrary commands as root without logging simply by setting that variable to something else.Always edit it with visudo to prevent errors. It is imperative that sudoers be free of syntax errors! Any error makes sudo unusable.$ sudo wpa_supplicant -B -i interface -c <(wpa_passphrase MYSSID passphrase ) Successfully initialized wpa_supplicantįailed to open config file '/dev/fd/63', error: No such file or directoryįailed to read or parse configuration '/dev/fd/63'

#Chef passwordless sudo working ubuntu full#

In the following example command substitution would work in a full shell, but fails with prepending sudo: In particular when using a redirection and command substitution, you must use a login shell, which can be easily accessed with sudo -iu user (one can omit -u user if the desired user is root). You cannot run every command as an other user simply by prepending sudo. To use sudo, simply prefix a command and its arguments with sudo and a space: To begin using sudo as a non-privileged user, it must be properly configured. Sudo can also be used to run commands as other users additionally, sudo logs all commands and failed access attempts for security auditing. By enabling root privileges only when needed, sudo usage reduces the likelihood that a typo or a bug in an invoked command will ruin the system. Unlike su, which launches a root shell that allows all further commands root access, sudo instead grants temporary privilege elevation to a single command. Sudo is an alternative to su for running commands as root. Sudo allows a system administrator to delegate authority to give certain users-or groups of users-the ability to run commands as root or another user while providing an audit trail of the commands and their arguments.