implmenting uniq -i command for linux

Question

1.00/5 (1 vote)

See more:

I try to implement uniq -i command, you must display the contents of a file without duplicate lines
exemple :
I have
I have
bad
you
you

I must display:
I have
bad
you

This is my function

Objective-C

void uniq_i()
{
   //file_name1=fopen(params[2],"r");
   
   if ( file_name1 != NULL )
   {
      
      fgets(prev1,199,file_name1);
      while ( fgets ( line, 199, file_name1 ) != NULL ) /* read a line */
      {
	
	if(!strcmp(prev1,line))
	{
	
		printf("%s", prev1);
		
		
	}
	else if(strcmp(prev1,line))
	{

		printf("%s",line);
		
		
	}
	
	strcpy(prev1,line);
      }
      
   }
   else perror("Eroare");
fclose ( file_name1 );
}

Posted 10-Jan-16 12:08pm

Laurentiu Bobora

Add a Solution

Comments

Garth J Lancaster 10-Jan-16 20:32pm

what is your code doing/not doing ? have you stepped through your code with a debugger/breakpoints etc ?

You also only seem to be interested in consecutive duplicate lines - what happens if you have

I have
I must
I have

???

Laurentiu Bobora 11-Jan-16 3:42am

It now correctly displays up to the first two lines then no longer works, if I have:
Jhon
Jhon
have
apple
apple

Print:
Jhon
have
apple
apple

I will try to do troubleshooting

2 solutions

Solution 1

how about like this:
uniq -f 1 -c file | awk '{print $2}'

Posted 10-Jan-16 21:51pm

Member 12256160

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Jochen Arndt · Accepted Answer · 2016-01-10T22:12:00

Solution 2

A possible solution would be:

// Get and print first line
if (fgets(prev1, 199, file_name1) != NULL)
    printf("%s",prev1);
while (fgets(line, 199, file_name1) != NULL)
{
    // Print if not identical to previous one
    if (strcmp(line, prev1))
        printf("%s",line);
    strcpy(prev1, line);
}

Posted 10-Jan-16 22:12pm

Jochen Arndt

Comments

Laurentiu Bobora 11-Jan-16 5:50am

and if you just want single lines ?

Jochen Arndt 11-Jan-16 6:10am

What do you mean by single lines?
Print only those lines that are not duplicates?

That is different from your initial question.
It may look like this (untested):

int dup = -1;
fgets(prev1, 199, file_name1);
while (fgets(line, 199, file_name1) != NULL)
{
// Mark as duplicate to be not printed later
if (0 == strcmp(line, prev1))
  dup = 1;
else
{
  if (dup <= 0)
   printf("%s", prev1);
  strcpy(prev1, line);
  dup = 0;
}
}
// Print last line if not identical to previous one
if (0 == dup)
printf("%s", prev1);

Laurentiu Bobora 11-Jan-16 6:21am

Thanks !!! :)