BSW Soft Interview Questions and Answers

The echo command is used to display a line of text or a variable value in the terminal.

• Used to print text or variable values to the terminal

• Can be used to create simple scripts or display messages to users

• Commonly used in shell scripting to output information

To check the computer name or hostname in Linux, you can use the 'hostname' command.

• Use the 'hostname' command to display the current hostname of the system.

• To change the hostname, use the 'hostnamectl set-hostname' command followed by the new hostname.

• To view the fully qualified domain name (FQDN), use the 'hostname -f' command.

To check the current user in Linux terminal, you can use the 'whoami' command.

• Use the 'whoami' command to display the current user's username.

• Alternatively, you can also use the 'id' command to display information about the current user.

To check the current path/directory, use the 'pwd' command in Unix/Linux or 'cd' command in Windows.

• In Unix/Linux, type 'pwd' and press Enter

• In Windows, type 'cd' and press Enter

Relative paths are based on the current directory, while absolute paths start from the root directory.

• Relative paths are shorter and do not include the full path from the root directory.

• Absolute paths start from the root directory and include the full path to the file or directory.

• Example of relative path: 'folder/file.txt'

• Example of absolute path: '/home/user/folder/file.txt'

The command 'chmod' is used to change permissions of a file in Linux.

• Use 'chmod' command followed by the permission code and the file name to change permissions of a file.

• For example, 'chmod 755 file.txt' will give read, write, and execute permissions to the owner, and read and execute permissions to group and others.

To edit an existing file on a Linux server, you can use a text editor like Vim or Nano.

• Use a text editor like Vim or Nano to open the file for editing

• Make the necessary changes to the file

• Save the changes and exit the text editor

To rename a file in Linux, you can use the 'mv' command.

• Use the 'mv' command followed by the current file name and the new file name

• Make sure to specify the full path if the file is not in the current directory

• You can also use relative paths for the file names

To search for a string in a file, you can use tools like grep or findstr.

• Use the grep command in Unix/Linux systems: grep 'search_string' file_name

• Use the findstr command in Windows systems: findstr 'search_string' file_name

• You can also use text editors like Vim or Notepad++ to search for a string in a file

grep is a basic pattern matching tool, while egrep is an extended version with support for regular expressions.

• grep is a basic command-line utility for searching plain text data for lines that match a regular expression pattern.

• egrep is an extended version of grep that supports extended regular expressions.

• egrep is equivalent to grep -E, enabling the use of extended regular expressions like +, ?, |, () in the pattern.

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