How do you find the third line of a file in Unix?

How do you find the third line of a file in Unix?

Below are three great 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 you print the nth line in Unix?

5 Sed ADDRESS Format Examples

1. This will match only Nth line in the input.
2. M~N with “p” command prints every Nth line starting from line M.
3. M,N with “p” command prints Mth line to Nth line.
4. $ with “p” command matches only the last line from the input.
5. N,$ with “p” command prints from Nth line to end of file.

How do you print a few lines in Unix?

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 I print a third line of a file?

Take your pick:

1. # Take the last line of the top three lines.
2. head -n 3 my. txt | tail -n 1.
3. # Tell sed to “be quiet”, and print just the third line.
4. sed -n 3p my. txt.
5. # Tell sed to delete everything except the third line.
6. sed ‘3! d’ my.
7. # Tell awk to print the third input record of the current file.
8. awk ‘FNR==3 {print}’ my.

How do you display the first 3 lines of a file in Unix?

To look at the first few lines of a file, type head filename, where filename is the name of the file you want to look at, and then press . By default, head shows you the first 10 lines of a file. You can change this by typing head -number filename, where number is the number of lines you want to see.

How do you print the last line of a file in Unix using sed?

In sed, $ indicates the last line, and $p tells to print(p) the last line($) only. 4. Another option in sed is to delete(d) all the lines other than(!) the last line($) which in turn prints only the last line.

How do I display only the 10th line of a file?

Type the following head command to display first 10 lines of a file named “bar.txt”:

1. head -10 bar.txt.
2. head -20 bar.txt.
3. sed -n 1,10p /etc/group.
4. sed -n 1,20p /etc/group.
5. awk ‘FNR <= 10’ /etc/passwd.
6. awk ‘FNR <= 20’ /etc/passwd.
7. perl -ne’1..10 and print’ /etc/passwd.
8. perl -ne’1..20 and print’ /etc/passwd.

How do I display the first few lines of a file in Unix?

How do you display the first 5 lines of a file in Unix?

How do I grep a specific line number?

The -n ( or –line-number ) option tells grep to show the line number of the lines containing a string that matches a pattern. When this option is used, grep prints the matches to standard output prefixed with the line number.

How to print specific lines from a file in Linux?

Printing specific lines from a file is no exception. To display 13th line, you can use a combination of head and tail: Or, you can use sed command: To display line numbers from 20 to 25, you can combine head and tail commands like this: Or, you can use the sed command like this:

How to print the 13th line from a file in Linux?

In Linux, there are several ways to achieve the same result. Printing specific lines from a file is no exception. To display 13th line, you can use a combination of head and tail: Or, you can use sed command: To display line numbers from 20 to 25, you can combine head and tail commands like this:

How do I print alternate lines in Unix?

Print every alternate line: $ sed ‘n;d’ file AIX Unix HPUX n command prints the current line, and immediately reads the next line into pattern space. d command deletes the line present in pattern space. In this way, alternate lines get printed.

How to print every 3rd Line in a file using Perl?

Hence, after the ‘n;n;’, the 3rd line is present in the pattern space and it is printed using the p command. And this repeats till the end of the file, and hence every 3rd line gets printed. 3. Using Perl: