PhonePe Site Reliability Engineer Interview Questions and Answers

To copy contents of a file to another file, you can use file handling methods in programming languages.

• Open the source file in read mode and the destination file in write mode

• Read the contents of the source file and write them to the destination file

• Close both files after the copying process is complete

Command to list CPUs in Linux system

• Use the 'lscpu' command to list detailed information about CPUs

• Use the 'nproc' command to display the number of processing units available

• Use the 'cat /proc/cpuinfo' command to view information about each CPU core

Command to check free disk space

• Use the 'df' command to check free disk space

• The '-h' option displays the output in human-readable format

• The '-T' option shows the filesystem type

• The '-x' option excludes specific filesystem types

• The '-t' option filters the output based on filesystem type

Command to check free memory space

• Use the 'free' command to check free memory space

• The 'free' command displays the total, used, and free memory space in the system

• It also shows the amount of memory used for buffers and cache

• The 'free' command can be used with options like '-h' for human-readable output

NoSQL is a non-relational database that provides flexible schema and horizontal scalability, while SQL is a relational database with structured schema and vertical scalability.

• NoSQL databases are schema-less and can handle unstructured data.

• SQL databases use structured query language and have predefined schemas.

• NoSQL databases are horizontally scalable, allowing for easy distribution of data across multiple servers.

• SQL databases are vertically scalable, meaning they can handl...read more

To copy files to a remote machine, use a file transfer protocol like SCP or SFTP.

• Use SCP (Secure Copy) command to copy files between local and remote machines

• Example: scp /path/to/local/file username@remote:/path/to/destination

• Use SFTP (Secure File Transfer Protocol) for interactive file transfers

• Example: sftp username@remote, then use put command to upload files

To rename a file, use the 'mv' command in the terminal or use a file manager with a rename option.

• In the terminal, use the 'mv' command followed by the current file name and the new file name.

• Example: mv oldfile.txt newfile.txt

• In a file manager, right-click on the file and select the 'Rename' option.

• Enter the new file name and press Enter.