How do you read a specific line from a text file in shell script?

How do you read a specific line from a text file in shell script?

Write a bash script to print a particular line from a file

1. awk : $>awk ‘{if(NR==LINE_NUMBER) print $0}’ file.txt.
2. sed : $>sed -n LINE_NUMBERp file.txt.
3. head : $>head -n LINE_NUMBER file.txt | tail -n + LINE_NUMBER Here LINE_NUMBER is, which line number you want to print. Examples: Print a line from single file.

How do you take input from a file in Linux?

To redirect input from a file, use the less-than symbol (<). The example here uses the sort command which simply sorts the input in order. The shell reads the contents of the required_packages. txt file into the standard input of the sort command which then orders the text and displays it on standard output.

How do you display the nth line of a file in Unix?

3 ways to get the Nth Line of a File in Linux

1. head / tail. Simply using the combination of the head and tail commands is probably the easiest approach.
2. sed. There are a couple of nice ways to do this with sed .
3. awk. awk has a built in variable NR that keeps track of file/stream row numbers.

How do I read a text file in Unix?

Use the command line to navigate to the Desktop, and then type cat myFile. txt . This will print the contents of the file to your command line. This is the same idea as using the GUI to double-click on the text file to see its contents.

What is EOF in a shell script?

Unix/Linux/Mac shell scripts support what is commonly called ‘Cat << EOF’ whereby an entire file can be included in a shell script and ‘restored’ to a separate file stored on the drive. In this scenario we want to be able to use a shell script to create the desired file.

How do I write a bash script?

Quick guide to writing a bash script on the Mac/Linux command-line 1. Open a new file 2. Write the shebang line: 3. Write script contents. 4. Make the script executable 5. Run the script 6. Add an input variable 7. Now run it: 8. Add an optional input variable 9. Now run it again:

What is bash prompt?

The Bash prompt is set by the environment variable PS1 (Prompt String 1), which is used for interactive shell prompts. There is also a PS2 variable, which is used when more input is required to complete a Bash command.

What is the role of shell in Unix?

In Unix, the shell is a program that interprets commands and acts as an intermediary between the user and the inner workings of the operating system.