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1. What is Shopt command?
2. What is a Bashrc file?
3. What is the use of TPUT command?
4. How to use read command in Bash script?
5. How do I open .bashrc in terminal?
6. Where do I find the .bashrc path?
7. What package provides tput?
8. How to use terminfo?
9. What is tput setaf?
10. How use SESU command in Unix?
11. What does set Pipefail mean?
12. What is Globstar in Linux?
13. What is Nullglob?
14. How to use su command without password?
15. What is chmod +s in Linux?
16. What is $() called in bash?

What is Shopt command?

On Unix-like operating systems, shopt is a builtin command of the Bash shell that enables or disables options for the current shell session.

What is a Bashrc file?

bashrc file is a script file that's executed when a user logs in. The file itself contains a series of configurations for the terminal session. This includes setting up or enabling: coloring, completion, shell history, command aliases, and more.

What is the use of TPUT command?

Description. The tput command uses the terminfo database to make terminal-dependent information available to the shell. The tput command outputs a string if the attribute CapabilityName is of type string. The output string is an integer if the attribute is of type integer.

How to use read command in Bash script?

To illustrate how the command works, open your terminal, type read var1 var2 , and hit “Enter”. The command will wait for the user to enter the input. Type two words and press “Enter”. read and echo are enclosed in parentheses and executed in the same subshell.

How do I open .bashrc in terminal?

From a login or other node on the cluster, type nano ~/. bashrc to open the file in the nano editor. My . bashrc has already been added to, so you'll see additional definitions below the # User specific aliases and functions section.

Where do I find the .bashrc path?

In most cases, the bashrc is a hidden file that lives in your home directory, its path is ~/. bashrc or USER/. bashrc with USER being the login currently in use.

What package provides tput?

tput is part of the ncurses package and is supplied with most Linux distributions.

How to use terminfo?

Every line in a terminfo source file must end in a comma. Every line in a terminfo source file except the header must be indented with one or more white spaces (either spaces or tabs). Entries in terminfo source files consist of a number of comma-separated fields. White space after each comma is ignored.

What is tput setaf?

“tput setaf” sets foreground color, “tput setab” sets background color, and “tput sgr0” resets all the settings to terminal default. There are 8 standard colors encoded in numbers from 0 to 7 (in order: black, red, green, yellow, blue, magenta, cyan, white).

How use SESU command in Unix?

The sesu utility lets you temporarily act as another user. This utility is the version of the UNIX su command. However, the sesu utility provides a user substitution command that does not require you to provide the password of the substituted user.

What does set Pipefail mean?

set -o pipefail

This setting prevents errors in a pipeline from being masked. If any command in a pipeline fails, that return code will be used as the return code of the whole pipeline. By default, the pipeline's return code is that of the last command even if it succeeds.

What is Globstar in Linux?

In shell-speak, globbing is what the shell does when you use a wildcard in a command (e.g. * or ?). Globbing is matching the wildcard pattern and returning the file and directory names that match and then replacing the wildcard pattern in the command with the matched items.

What is Nullglob?

a] nullglob : If set, bash allows patterns which match no files to expand to a null string, rather than themselves. This is useful to check for any *. mp3 or *. cpp files in directory.

How to use su command without password?

Using Sudoers File

You can also su to another user without requiring a password by making some changes in the sudoers file. In this case, the user (for example aaronk) who will switch to another user account (for example postgres) should be in the sudoers file or in the sudo group to be able to invoke the sudo command.

What is chmod +s in Linux?

This “s” indicates the file has the setuid bit set.

The passwd command will always run with root privileges no matter who launches it because the owner of the file is root. We can use the chmod command to set the setuid bit on a file: chmod u+s FILE.

What is $() called in bash?

It turns out, $() is called a command substitution. The command in between $() or backticks (“) is run and the output replaces $() . It can also be described as executing a command inside of another command.