Count the number of rows per column in Bash Shell

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I am new to Bash Shell and I could'nt find useful resources online(maybe someone can suggest some resources for me). I am working on a csv file and I would like to know how to get the count of rows per column without the nulls.

I know we use this code to count the number of lines in a file. But what if I want to specify a column?

cat FILE_NAME | wc -l

For example, I have the below csv file

ID   Name
------------
13    Sara
22    Suzan
null  Mark
49    John

I would like the count for ID column to return 3.

Thank you,

Based on assumption of required output, you have given

$ cat testfile 
ID   Name
------------
13    Sara
22    Suzan
null  Mark
49    John

$ awk '$1 ~ /^[0-9]*$/{ count++ }END{print count}' testfile 
3

$ awk 'function is_num(x){return(x==x+0);} is_num($1){ count++ }END{print count}' testfile 
3

unix - count of columns in file, How do I count the number of columns in Linux? For each line in file.txt we extract a second column with awk ($i). Then we use echo and bc command to add all numbers $i to get a total $total. The script also stores a number of loops $count. The last line uses echo and bc commands to calculate average with two decimal points.

In the bash world, columns are what you make them, usually via setting something named field separator (delimiter). There is some mess in the ecosystem. Usually the separator is only a single character, often <tab> by default (cut, paste, ...). But for example sort and awk use a whole stretch of blanks as one separator, if you don't set it manually (but you can set only a single char, if you want <tab>, use eg awk -F$'\t').

If your data looks as in your question - that is it has fixed width columns - you'd be better of with awk, unless there is an empty field in one of the columns (awk '{print $1}'). The other option for parsing a fixed width format is eg cut -c1-4 (from each line print characters 1 to 4, which would be your ID).

Then counting the non-nulls. You want to skip header first, that is tail -n +3 in your case, and your 'empty' field is a string match, so grep is advisable (grep -v -c 'null').

You can test your pipeline piece by piece by deleting it from the back (and adding head).

<input tail -n +3 |
  cut -c1-4 |
  grep -v -c 'null'

How to Count the Number of lines, Words, and, Characters in a Text , How do I count the number of rows in a text file? Thanks for contributing an answer to Unix & Linux Stack Exchange! Please be sure to answer the question. Provide details and share your research! But avoid … Asking for help, clarification, or responding to other answers. Making statements based on opinion; back them up with references or personal experience.

You can use grep , cut or awk as suggested before.The main idea is to count the null values of the column and then subtract from the number of rows, the number of null values you count,to find out the without null values.

Find number of columns in csv file, How do I count the number of columns in a csv file? I am working on a csv file and I would like to know how to get the count of rows per column without the nulls. I know we use this code to count the number of lines in a file. But what if I want to specify a column?

How to count lines in a document?, How do I count the number of lines in a file in Linux? Following command will count number of lines in /etc/passwd files and print on terminal. We can also use –lines in place of -l as command line switch. $ wc -l /etc/passwd Count Total Character in File: Use -m or –chars switch with wc command to count number of characters in a file and print on screen. $ wc -m /etc/passwd Count Total Words

count number of rows based on other column values, Is it possible to check if cut -c3-4 = AB is true then select only that Tagged: filter rows, grep, shell scripts, solved. Discussion started by ashok.k and  I am having trouble finding examples in bash where you can use information from 2 separate files at once. Here's what I am trying to do: The first file has specified ranges that I want averages for: ranges.txt. Sc0 1 5 Sc1 69 72 The second file contains the numbers I need to take the averages from (using the 3rd column): allNumbers.txt

Counting the number of columns below a value for each row, The number of fields per record (whitespace-delimited columns per row, by default) is NF . You may loop over all the fields in a record with for (i  Finding the average of a column excluding certain rows using AWK linux , bash , awk , scripting Through awk, $ awk '$5!="99999"{sum+=$5}END{print sum}' file 227.5 Explanation: $5!="99999" if 5th column does not contain 99999, then do {sum+=$5} adding the value of 5th column to the variable sum.

Comments
  • You can use awk and increment a counter variable whenever the column doesn't contain null, then print the variable at the end.
  • As for the resources - I learned a lot by reading the whole coreutils manual. Be sure not to miss the chapter on Software Tools.
  • Thank you, the first line worked just fine. I also added NR>1 to skip the header. awk 'NR>1 && $2 ~/[0-9]*$/ {count++ }END{print count}' testfile
  • Not trying to parse columns, just hacking a one-off solution for this case, grep -c '^[0-9]' would do...