How to Print the First Column or Last Column or Both Using 'awk'

1. How do I print the first column in awk?
2. How do I print the last column in awk?
3. How do I print columns in awk?
4. How do I print the first column in Unix?
5. How do I print first column?
6. How do I make an AWK file?
7. How do you display the last column in Unix?
8. How do I print the second last column in awk?
9. How do you sum in awk?

How do I print the first column in awk?

awk to print the first column. The first column of any file can be printed by using $1 variable in awk. But if the value of the first column contains multiple words then only the first word of the first column prints. By using a specific delimiter, the first column can be printed properly.

How do I print the last column in awk?

As soon as you will hit the Enter key, all the values of the last column of the file awk. txt will appear on your terminal as shown in the following image. The awk command will read this column whereas the print command will be responsible for displaying its values on the terminal.

How do I print columns in awk?

Printing the nth word or column in a file or line

1. To print the fifth column, use the following command: $ awk ' print $5 ' filename.
2. We can also print multiple columns and insert our custom string in between columns. For example, to print the permission and filename of each file in the current directory, use the following set of commands:

How do I print the first column in Unix?

Just put both column references next to each other.

1. cat logfile | sed 's/|/ /' | awk 'print $1, $8'
2. sed 's/|/ /' logfile | awk 'print $1, $8'
3. awk -F '|' 'print $1, $8' logfile.
4. awk -F '|' 'print $1, $NF' logfile.

How do I print first column?

Example 4: Print the first column of a file without using a field separator. If no field separator is used in the `awk` command, then a space is used as the default field separator. The following `awk` command will print the first column by using the default separator.

How do I make an AWK file?

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 do you display the last column in Unix?

Performance

1. using awk : $ time awk 'print $NF' datafile > /dev/null real 0m12.124s user 0m10.704s sys 0m0.709s.
2. using grep : $ time grep -o '\S\+$' datafile > /dev/null real 0m36.731s user 0m36.244s sys 0m0.401s $ time grep -o '\S*$' datafile > /dev/null real 0m40.865s user 0m39.756s sys 0m0.415s.

How do I print the second last column in awk?

Print second-to-last column/field in `awk`

1. NF is the last field index, $NF is the value of the last field – glenn jackman Jan 19 '10 at 21:00.
2. that makes sense now. thats why the dollar outside the parenthesis works I suppose – Brian G Feb 11 '10 at 17:09.

How do you sum in awk?

2 Answers. The -F',' tells awk that the field separator for the input is a comma. The sum+=$4; adds the value of the 4th column to a running total. The ENDprint sum; tells awk to print the contents of sum after all lines are read.