Find records present in file 1 also in both file 2 and file 3
I have three files file1.txt, file2.txt, file3.txt and they are of same format.
awk
Sed — Replace first k instances of a word in the file
I want to replace only the first k instances of a word.
Split a file into two
I have a big file and need to split into two files. Suppose in the first file the 1000 lines should be selected and put into another file and delete those lines in the first file.
Delete range of lines above pattern with sed (or awk)
I have the following code that will remove lines with the pattern banana and 2 lines after it:
What are the exact differences between awk and cut with grep?
We know that we can get the second column of the line we want from a file using these two techniques: awk '/WORD/ { print $2 }' filename or grep WORD filename| cut -f 2 -d ' ' My questions are: What are the differences between the two commands above? Which one has the best … Read more
Adding a Column of values in a tab delimited file
How can I add a Column of values in a file which has a certain number of rows.
I have a input file like this:
Diff, show modified line from right file only
I have file a and b and I would like to output lines of b that changed since it was cloned from a. Just the modified lines, no surrounding context, no diff offset marks.
How to remove multiple newlines at EOF?
I have files that end in one or more newlines and should end in only one newline. How can I do that with Bash/Unix/GNU tools?
Efficient way to print lines from a massive file using awk, sed, or something else?
If I had a plain-text file containing 8 million lines and I want to print out lines 4,000,010 to 4,000,000 to the screen, which would be more efficient: awk or sed? There is no pattern to the text, and unfortunately, a database isn’t an option. I know this isn’t ideal, I’m just curious on which … Read more
Convert rows to columns
I have a file that includes details about VMs running in a hypervisor. We run some command and redirect the output to a file. And the is data available in the below format.