How can I format my grep output to show line numbers at the end of the line, and also the hit count?

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I'm using grep to match string in a file. Here is an example file:

example one,
example two null,
example three,
example four null,

grep -i null myfile.txt returns

example two null,
example four null,

How can I return matched lines together with their line numbers like this:

  example two null, - Line number : 2
  example four null, - Line number : 4
  Total null count : 2

I know -c returns total matched lines, but I don't how to format it properly to add total null count in front, and I don't know how to add the line numbers.

What can I do?

-n returns line number.

-i is for ignore-case. Only to be used if case matching is not necessary

$ grep -in null myfile.txt

2:example two null,
4:example four null,

Combine with awk to print out the line number after the match:

$ grep -in null myfile.txt | awk -F: '{print $2" - Line number : "$1}'

example two null, - Line number : 2
example four null, - Line number : 4

Use command substitution to print out the total null count:

$ echo "Total null count :" $(grep -ic null myfile.txt)

Total null count : 2

grep command in Unix/Linux, Which option with the grep command displays only the number of matching lines in a file? $ grep -n "line" example-file.txt 1:This is line 1 3:This is line 3 5:This is line 5 7:This is line 7 9:line 10:Another line 11:And Another line Now, we have the line number as part of the output, and we can instantly jump to that line in our favourite text editor.

Use -n or --line-number.

Check out man grep for lots more options.

Search Multiple Words / String Pattern Using grep Command on , 'pattern*' file1 file2. Next use extended regular expressions: egrep 'pattern1|pattern2' *. grep -n will print line numbers with the match. You can translate the first colon produced by grep and all other whitespace to a single space with sed 's/:/ /;s/\s\s*/ /g'. You then want the first and third section, which can be achieved with cut -d ' ' -f 2 --complement. Chaining these all together, you would get something like:

use grep -n -i null myfile.txt to output the line number in front of each match.

I dont think grep has a switch to print the count of total lines matched, but you can just pipe grep's output into wc to accomplish that:

grep -n -i null myfile.txt | wc -l

Linux Essentials Chapter 8 Exam - ICT Community, in a file that contain a specified Regular Expression. I use an alias for grep, that adds line numbers to the output: alias grep="grep -n -I --color" For a certain command I'd like to remove the -n from the grep command. I could not find a "Do not add line numbers"-flag. Is something like this available or do I have to add an extra alias without linenumbers?

Or use awk instead:

awk '/null/ { counter++; printf("%s%s%i\n",$0, " - Line number: ", NR)} END {print "Total null count: " counter}' file

-n returns line number. -i is for ignore-case. Only to be used if case matching is not necessary $ grep -in null myfile.txt 2:example two null, 4:example four null,. To search multiple string and output line numbers and browse thru the output, type: egrep -ne 'null|three'. will show: 2:example two null, 3:example three, 4:example four null, egrep -ne 'null|three' | less. will display output in a less session. HTH Jun.

grep find the lines and output the line numbers, but does not let you "program" other things. If you want to include arbitrary text and do other "programming", you can use awk,

$ awk '/null/{c++;print $0," - Line number: "NR}END{print "Total null count: "c}' file
example two null,  - Line number: 2
example four null,  - Line number: 4
Total null count: 2

Or only using the shell(bash/ksh)

c=0
while read -r line
do
  case "$line" in
   *null* )  (
    ((c++))
    echo "$line - Line number $c"
    ;;
  esac
done < "file"
echo "total count: $c"

grep, egrep, fgrep - print lines matching a pattern Similarly, it must be either at the end of the line or followed by a non-word constituent character. (non-empty​) strings, matching lines, context lines, file names, line numbers, byte When the -c or --count option is also used, grep does not output a count greater than NUM. grep -w gnu /usr/share/words gnu Show Line Numbers # The -n ( or --line-number) option tells grep to show the line number of the lines containing a string that matches a pattern. When this option is used, grep prints the matches to standard output prefixed with the line number.

How do I use the grep command with regular expressions on a Linux and You can use ^ and $ to force a regex to match only at the start or end of a line, respectively. In this example, I will match mobile number which is in the following format Matches the empty string at the beginning of a line; also represents the  I would like to use the grep command to print a line number for the string I'm searching for. However, when I used the command grep -n it prints the line number with a colon : next to it. Is there any way I can use the same grep -n command to print a line number with it being followed by the : colon?

Let us see how to use grep on a Linux or Unix like system. Search any line that contains the word in filename on Linux: grep However, above command can be also used as follows without shell pipe: How to count total number of lines using shell script. my date format is 07-JUN-2011 01:13:00. The following grep grep -r -e -n coll * will display fullpath/filename: <tag-name>coll</tag-name> I would like to know what line has the following text, I tried adding -n, but it Ubuntu Community

Options Description -c : This prints only a count of the lines that match a pattern -h the output using grep -n : To show the line number of file with the line matched. Matching the lines that end with a string : The $ regular expression pattern If you like GeeksforGeeks and would like to contribute, you can also write an 

Comments
  • can I format this by adding line numbers after instead of before with :?
  • your solution seems fine but get an error awk95: syntax error at source line context is >>> ' <<< missing } awk95: bailing out at source line 1
  • sorry switched to linux now its working :) it was windows version not so good
  • ...the knights who say -ni thats how you remember this trick
  • new linux user is lazy of reading man page. But if they use linux enough, they will be used to it :) It's super useful :)
  • Not always lazy, (But sometimes), often it is that a new Linux user has trouble understanding a man page. (They can seem cryptic)
  • sometimes man page can take many pages. And this is hard to read all of them
  • -c will print the total lines matched
  • You are right. Unfortunately it also suppresses normal output.