What command will display the group names and GIDs to which a user belongs? (Provide only the command name with or without path information)
Theidcommand will display the user ID (uid), the primary group ID (gid), and the supplementary groups (groups) of a user. The output will show the names and the numerical IDs of the groups. For example:
id linuxize
The command will show the user ID (uid), the user's primary group (gid), and the user's secondary groups (groups)
uid=1001(linuxize) gid=1001(linuxize) groups=1001(linuxize),27(sudo)
To print only the names instead of the numbers use the-noption.
id -nG linuxize
The command will show only the names of the groups
linuxize sudo
Theidcommand is part of the GNU coreutils package and is available on all Linux systems. The full path of the command is/usr/bin/id.Reference:
How to List Groups in Linux | Linuxize
Which crontab entry could be used to set the system time at regular intervals?
Which command is used to sync the hardware clock to the system clock? (Specify ONLY the command without any path or parameters.)
The command that is used to sync the hardware clock to the system clock is:
hwclock --systohc
Which of the following find commands will print out a list of files owned by root and with the SUID bit set in /usr?
This command will find all the files in the /usr directory that have the user ID (UID) of 0, which is the root user, and have the permission of 4000, which is the SUID bit. The SUID bit allows the file to be executed with the privileges of the file owner, regardless of who runs it. The -uid option tests for a specific UID, and the -perm option tests for a specific permission. The + sign before the permission means that at least those bits are set; the - sign means that exactly those bits are set. The other options are either invalid or do not match the criteria.Reference:
find manual page, -uid and -perm options description
Find Command in Linux with Practical Examples, Example 8: Find Files with SUID and SGID Permissions
What is a purpose of an SSH host key?
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