CODEWITHSUNDEEP
bashgrepuniq
Lazuardi N Putra
Lazuardi N Putra

Reputation: 428

Bash : grep unique lines

I'd like to grep unique line. This is the file content:

this is line 1
this is line 1
this is line 2
this is line 1
this is line 1

I just want to output this is line 2 to my shell. How can I do that?

Upvotes: 2

Views: 20419

Answers (3)

Jotne
Jotne

Reputation: 41460

Here is an awk solution:

awk '{a[$0]++} END {for (i in a) if (a[i]==1) print i}' file
this is line 2

Upvotes: 4

user559633
user559633

Reputation:

Check out man uniq:

 -u      Only output lines that are not repeated in the input.

With that in mind, sort does a pairwise comparison to see if it's neighbor matches, meaning that you need to sort your output before feeding it to uniq:

$ sort my_list.txt | uniq -u

Upvotes: 5

KeepCalmAndCarryOn
KeepCalmAndCarryOn

Reputation: 9075

sort x.txt |uniq -u

assuming your file is in x.txt which gives

this is line 2

Upvotes: 11

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