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To schedule a cron job, use the crontab command to edit the cron table file.
Use the crontab -e command to open the cron table file for editing
Add a new line to the file with the schedule timing and the command to be executed
Save and exit the file to schedule the cron job
Sticky bit is a permission in Unix/Linux that allows only the owner of a file to delete or rename it.
Sticky bit is represented by a 't' in the permissions of a file or directory.
When the sticky bit is set on a directory, only the owner of a file within that directory can delete or rename the file.
Commonly used on directories like /tmp to prevent users from deleting each other's files.
Example: chmod +t directory_name
top and ps are commands used in Linux to display information about running processes and system resource usage.
top command displays real-time information about running processes, CPU usage, and memory usage
ps command displays a snapshot of the current processes running on the system
Both commands can be used to monitor system performance and troubleshoot issues
I applied via Naukri.com and was interviewed in Apr 2023. There were 2 interview rounds.
Linux is an open-source operating system based on Unix. Its components include kernel, shell, GUI, utilities, and applications.
Kernel: manages hardware resources and provides services to other system components
Shell: provides a command-line interface for users to interact with the system
GUI: provides a graphical interface for users to interact with the system
Utilities: perform various system tasks such as file manageme...
Links are pointers to files or directories. Linux permissions control access to files and directories.
Links can be hard links or symbolic links
Hard links point directly to the file's inode
Symbolic links point to the file's path
Linux permissions are divided into three categories: owner, group, and others
Each category has three types of permissions: read, write, and execute
Permissions can be set using chmod command
I applied via Approached by Company and was interviewed in Feb 2023. There were 2 interview rounds.
Rollback patching is a process of reverting a patch or update to a previous version.
Rollback patching is useful when a patch or update causes issues or conflicts with the system.
It involves undoing the changes made by the patch or update and restoring the system to its previous state.
Rollback patching can be done manually or automatically depending on the system and the patching process.
Examples of rollback patching to...
To check logs at a particular time and send a report to the client, use the 'grep' command and a cron job.
Use the 'grep' command to search for logs at a specific time.
Create a cron job to run the 'grep' command at the desired time.
Use a script to format the log data and send it to the client.
Consider using a tool like Logwatch or Logrotate for automated log management.
To create a repository, you need to choose a package manager and create a configuration file.
Choose a package manager like YUM or APT
Create a configuration file with repository details
Add packages to the repository
Sign the repository to ensure package integrity
Publish the repository for others to use
HCL Group interview questions for designations
I applied via Recruitment Consulltant and was interviewed before Jun 2023. There was 1 interview round.
Linux is an open-source operating system based on Unix. Unix is a family of multitasking, multiuser computer operating systems.
Linux is open-source and free to use, while Unix is proprietary and usually requires a license.
Linux has a larger community and more distributions (e.g. Ubuntu, CentOS), while Unix has fewer variations (e.g. Solaris, AIX).
Linux is more customizable and can run on a wider range of hardware, whil...
To check prod servers, use monitoring tools, log files, performance metrics, and manual checks.
Use monitoring tools like Nagios, Zabbix, or Prometheus to track server health and performance.
Check log files for any errors or warnings that could indicate issues on the prod servers.
Monitor performance metrics such as CPU usage, memory usage, disk space, and network traffic.
Perform manual checks on critical services and ap...
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I applied via Campus Placement and was interviewed before Mar 2022. There were 2 interview rounds.
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I applied via Naukri.com and was interviewed before Feb 2020. There were 3 interview rounds.
I applied via Naukri.com and was interviewed in Nov 2019. There was 1 interview round.
The command to check load average is 'uptime' or 'w' in the terminal.
Use the 'uptime' command to display the load average for the system.
Alternatively, you can use the 'w' command to see load average along with other information.
Load average represents the average system load over a period of time.
LVM stands for Logical Volume Manager, used to manage disk space by creating logical volumes from physical volumes.
LVM allows for dynamic resizing of logical volumes without downtime.
To extend an LVM, first add a new physical volume to the volume group using 'pvcreate'.
Then extend the volume group to include the new physical volume using 'vgextend'.
Finally, extend the logical volume using 'lvextend' and resize the file
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