Linux awk command with 10 examples

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

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.

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.

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 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.

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 run an awk script?

Use either ' awk ' program ' files ' or ' awk -f program-file files ' to run awk . You may use the special ' #! ' header line to create awk programs that are directly executable. Comments in awk programs start with ' # ' and continue to the end of the same line.

How does AWK work in Unix?

Awk can process textual data files and streams. The input data is divided into records and fields. Awk operates on one record at a time until the end of the input is reached. Records are separated by a character called the record separator.

What does grep command do?

grep is a command-line utility for searching plain-text data sets for lines that match a regular expression. Its name comes from the ed command g/re/p (globally search for a regular expression and print matching lines), which has the same effect.

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.

Who command in Linux?

The standard Unix command who displays a list of users who are currently logged into the computer. The who command is related to the command w , which provides the same information but also displays additional data and statistics.

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.