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How to print the second to last field in AWK?
I want to print the second-to-last column or field in awk. The number of fields is the NF variable. I know that I should be able to use $NF, but I’m not sure how it can be used.
How to print three columns of data in AWK?
Suppose you have a file named foo with these contents, three columns of data separated by blanks: Next, here are the awk examples: As you can see, with awk you can print any column you want, and you can easily rearrange the order of the columns when you print them out.
Which is an example of an awk command?
One of my favorite ways to use the Unix awk command is to print columns of information from text files, including printing columns in a different order than they are in in the text file. Here are some examples of how awk works in this use case.
What’s the difference between print and print in AWK?
The difference between printf and print is the format argument. This is an expression whose value is taken as a string; it specifies how to output each of the other arguments. It is called the format string . The format string is very similar to that in the ISO C library function printf.
How to find the second most repeated word in a sequence?
Declare a hash table. Store the frequency of each string in a hash table. Iterate over the hash table and find the string with the second-highest frequency. Print the string. The hash table will look like this:
How to read only the second last line of a file?
On each line sed e x changes buffers (swaps contents of hold space and pattern space) and, if not on the last line, it d eletes the current pattern space (so nothing gets printed). Only on the last line sed autoprints the pattern space (which contains the previous line, i.e. second to last one)
How to get the second last word in a string?
The trade-off you have to make is between the expressiveness of regular expressions and the performance of plain substr and instr. Personally I prefer regexes unless there is a clear performance issue. If we use a ‘-1’ magic option in INSTR then we can search the string in reverse order.
Can a AWK search for the last line in a file?
Awk can search for A1 as well, which shortens the command line to Thanks to @MitchellTracy’s comment, tail might miss the record containing A1 and thus you get no output at all. This may be solved by switching tail and awk, searching first through the file and only then show the last line:
How to print the last column from a file?
In this article, we aim to walk you through the different methods of using the “awk” command to print the last column from a file. There are two different methods in which we can use the “awk” command to print the last column from a file.
How to print the last field in line?
Due to technical reason on my Solaris machine, I can’t use awk in order to print the last field in line. What are the other alternatives to awk that print the last field from line (using cut or tr …etc)?