Awk Command in Linux with Examples

1. What is awk command in Linux with example?
2. What is awk example?
3. What does awk command do in Linux?
4. How use awk command in Unix with example?
5. How do I use awk commands?
6. What does AWK mean?
7. What is the difference between grep and awk?
8. How do I write an awk script?
9. What is begin in awk?
10. How do I list users in Linux?
11. How do I grep a file in Linux?
12. How do I show a specific line in Linux?

What is awk command in Linux with example?

Awk is a scripting language used for manipulating data and generating reports. The awk command programming language requires no compiling, and allows the user to use variables, numeric functions, string functions, and logical operators.

What is awk example?

Printing Columns by Pattern

When a pattern match succeeds, AWK prints the entire record by default. But you can instruct AWK to print only certain fields. For instance, the following example prints the third and fourth field when a pattern match succeeds.

What does awk command do in Linux?

AWK command in Linux enable a programmer to write useful programs in the form of statements defining specific patterns to be searched for in each line of the file and the action which is to be taken when a match is found within a line. AWK command in Unix is used for pattern processing and scanning.

How use awk command in Unix with example?

Awk can take the following options:

1. -F fs To specify a file separator.
2. -f file To specify a file that contains awk script.
3. -v var=value To declare a variable.
4. FIELDWIDTHS Specifies the field width.
5. RS Specifies the record separator.
6. FS Specifies the field separator.
7. OFS Specifies the Output separator.

How do I use awk commands?

awk Scripts

1. Tell the shell which executable to use to run the script.
2. Prepare awk to use the FS field separator variable to read input text with fields separated by colons ( : ).
3. Use the OFS output field separator to tell awk to use colons ( : ) to separate fields in the output.
4. Set a counter to 0 (zero).

What does AWK mean?

AWK means "Awkward". It is typically used in response to someone describing an event that placed them in an awkward situation.

What is the difference between grep and awk?

Grep is useful if you want to quickly search for lines that match in a file. ... Awk is an entire programming language built around reading CSV-style files, processing the records, and optionally printing out a result data set. It can do many things but it is not the easiest tool to use for simple tasks.

How do I write an awk script?

#!/usr/bin/awk -f BEGIN printf "%s\n","Writing my first Awk executable script!"
...
Explaining the line above:

1. #! – referred to as Shebang, which specifies an interpreter for the instructions in a script.
2. /usr/bin/awk – is the interpreter.
3. -f – interpreter option, used to read a program file.

What is begin in awk?

BEGIN pattern: means that Awk will execute the action(s) specified in BEGIN once before any input lines are read. END pattern: means that Awk will execute the action(s) specified in END before it actually exits.

How do I list users in Linux?

How to List Users in Linux

1. Get a List of All Users using the /etc/passwd File.
2. Get a List of all Users using the getent Command.
3. Check whether a user exists in the Linux system.
4. System and Normal Users.

How do I grep a file in Linux?

The grep command consists of three parts in its most basic form. The first part starts with grep , followed by the pattern that you are searching for. After the string comes the file name that the grep searches through. The command can contain many options, pattern variations, and file names.

How do I show a specific line in Linux?

How to Display Specific Lines of a File in Linux Command Line

1. Display specific lines using head and tail commands. Print a single specific line. Print specific range of lines.
2. Use SED to display specific lines.
3. Use AWK to print specific lines from a file.