remove of duplicate line from a file

Shell Programming and Scripting
1

I have a file a.txt having content like

deepak
ram
sham
deepram
sita
kumar

I Want to delete the first line containing "deep" ...

I tried using...

grep -i 'deep' a.txt

It gives me 2 rows...I want to delete the first one..
+ need to know the command to delete the line from a file by line number.

2 
$ sed '1d' filename

Here "1" is the line number .. u can change as your wish..

3

do you know the answer of my first question?

4 
$ grep -i 'deep' filename | sed '1d'
1 Like
5 
 
$nawk '{if($0~/^deep/ && count==0){count++}else{print $0;}}' input.txt > output.txt
ram
sham
deepram
sita
kumar

$cat input.txt
deepak
ram
sham
deepram
sita
kumar
6

Another approach:

awk '/deep/ && !c++{next}1' file