[SOLVED] removing duplicate words from sentences in file

Issue

how can I remove the duplicate words from sentences in file ,each sentence written in a separate line.

thank you

I have these sentences in file

hello every body hello
word I should remove the word
how can can i remove it ?

the expected out put should be

hello every body
word I should remove the
how can i remove it ?

Solution

You can do:

awk '{for(i=1;i<=NF;i++) if(++arr[$i]==1) print $i}' file

Prints:

hello
every
body
word
I
should
remove
the
how
can
i
it
?

To maintain the line structure:

awk '{for(i=1;i<=NF;i++) 
       if(++arr[$i]==1) 
          printf "%s%s", $i, OFS
       print ""}' file

Prints:

hello every body 
word I should remove the 
how can i it ? 

If the deduplication is only on a per line basis:

awk '{delete arr
      for(i=1;i<=NF;i++) 
         if(++arr[$i]==1) printf "%s%s", $i, OFS
      print ""}' file

Prints:

hello every body 
word I should remove the 
how can i remove it ? 

Answered By - dawg