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How to use grep on column in Linux?
The -F, parameter specifies the delimiter, which is set to a comma for your data. $2 refers to the second column, which is what you want to match on. “ST” is the value you want to match. Thanks for contributing an answer to Unix & Linux Stack Exchange!
Can you use grep to extract a CSV file?
I have a csv file, fields separated by ;. I’m asked to make a shell command using grep to list only the third column, using regex. I can’t use cut. It is an exercise. My file is like this:
How to use grep on column in AWK?
Here I want to only grep the pattern ST in 2nd column. How to do this ? Without doing some fancy RegEx where you count commas, you’re better off using awk for this problem. The -F, parameter specifies the delimiter, which is set to a comma for your data. $2 refers to the second column, which is what you want to match on.
Can You chain two instances of grep together?
On a system where grephas the -ooption, you can chain two instances together — one to trim everything after the fourth column (and remove lines with less than four columns), another to take only the last remaining column (thus, the fourth):
How to print column 1 and 3 in grep?
A nice combo is using grep and awk with a pipe. The following code will print column 1 and 3 of only the lines of your file that contain ‘p1’: If you want to retain the first column and a column which contains a specific string in the first row (eg.
Is there a way to retain the first column in a column?
If you want to retain the first column and a column which contains a specific string in the first row (eg. B), then this should work. It assumes that your string is only present once though. There is probably a better solution with amazing awk, but this should work.
How to get the last match in a file using grep?
What’s the best way of getting only the final match of a regular expression in a file using grep? Also, is it possible to begin grepping from the end of the file instead of the beginning and stop when it finds the first match? For someone working with huge text files in Unix/Linux/Mac/Cygwin.
How to get the answer only with grep?
You can get the answer only with grep command. But I strongly recommend you use awk command. Note: that will find a 5 anywhere in MyDataFile. To restrict to the second column, a short script is what would suit your needs. If you want to limit it to the second column only, then a quick script like the following will do.
What happens when a grep is sent to the background?
What is happening with this dual grep command is that the first grep is being sent to the background with the & operator. As it is sent to background, the next grep command executes immediately afterwards giving you a uniform output.
How to find unique values in a data file?
I want to find all the different types of values in the 3rd column by a particular username lets say name 1. grep name1 filename gives me all the lines, but there must be some way to just list all the different type of values?