Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Displaying every other line in an array.
Top Forums UNIX for Beginners Questions & Answers Displaying every other line in an array. Post 303042527 by ignatius on Friday 27th of December 2019 10:04:33 PM
Old 12-27-2019
Yes. The logic helps. However, i'm a newbie. And it's just easier to write arrays... A new problem has arisen.

I created an array (testarray3), but for some reason it doesn't display when I do a

Code:
           if (selection == 0) pbtelnet(testarray[0], testarray2[0], testarray3[0]);

Here is the relevant code:
Code:
           char buf3[128];
           int arraylength3=0; 
           char **testarray3=NULL;
           FILE *fp3=fopen("hosts3.txt","r"); 

           while(fgets(buf3,128,fp3) != NULL)
           { 
                         chomp(buf3); // Remove \n from end of line
                         if(strlen(buf3) > width) width=strlen(buf3); 
                         if(!buf3[0]) continue; // Ignore blank lines
                         arraylength3++; 
                         // Room for n+1 elements of char * size. 
                         testarray3=realloc(testarray3, sizeof(char *)*(arraylength3+1)); 
                         // strdup is an easy str=malloc(strlen(s)+1); strcpy(str,s); 
                         testarray3[arraylength3-1]=strdup(buf3); 
           }
           // The +1 gives us room for a NULL on the end.  Makes it easier to find crashes. 
           testarray3[arraylength3]=NULL; 
           fclose(fp3);         

           // If no elements were loaded, it will still be NULL 
           if(testarray3 == NULL)         
           {                 
                         fprintf(stderr, "Unable to load options\n"); 
                         exit(1); 
           }

And here is the prototype for pbtelnet:
Code:
            int pbtelnet(const char *name, const char *address, const char *portnum);


Thanks for any and all help. It is greatly appreciated.
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

displaying the first line?

how do i display just the first line of a file with the cat command or any command for that matter (4 Replies)
Discussion started by: imuuk
4 Replies

2. Shell Programming and Scripting

displaying the path in the command line

Hi all, Does anyone know how to ammend the .cshrc file in $HOME for your session to display the path as part of the command line? So that I dont need to keep on typing pwd to see where I am? thanks Ocelot (2 Replies)
Discussion started by: ocelot
2 Replies

3. UNIX for Dummies Questions & Answers

displaying the last line of the file

hi... i need to display the last line of the file and capture the line in to a variable in unix envt.(not the perl ones)... please help (8 Replies)
Discussion started by: lmadhuri
8 Replies

4. UNIX for Dummies Questions & Answers

displaying mutliple fields on command line

This is probably the dumbest question you guys can get, but I'm trying, as a complete noob, to display the unix calendar for all the months without Saturday and Sunday showing. How can I remove those fields without having to type all the fields in individually such as: cal -y | awk '{print $2,... (3 Replies)
Discussion started by: Trellot
3 Replies

5. Shell Programming and Scripting

Displaying Array Elements in Shell Scripts

Hi All, I am using the following piece of script to print all the array elements in a script by name compare.sh: 31 len=${#array }; 32 j=0; 33 #echo "The length of the array is : $len" 34 while ; do 35 temp=${array} 36 echo "$temp" 37 let $j++ 38 done But I am getting the... (2 Replies)
Discussion started by: ananddr
2 Replies

6. UNIX for Dummies Questions & Answers

Displaying the Second Line of the Grep Search Results

Hi I really hope someone can help with the below question. Lets say that I have a file called output.txt and I want to display all of the lines which contain the word ‘disconnect'. I know that this can easily be obtained by using the following command: grep -i disconnect output.txt However,... (6 Replies)
Discussion started by: Sunny Sid
6 Replies

7. Shell Programming and Scripting

displaying a column in horizontal line separated by ', '

cat my.log blah blah blah < 1 djfh jsdfhk jksdfh < 2 dshkfl opeir pqowi < 4 khasd wouipeui say i am perfroming some action similar to below... cat my.log | egrep "<" | awk -F' ' '{print $2}' | grep -v "" it gives output as below 1 2 4 is there anyway to modify above same... (4 Replies)
Discussion started by: vivek d r
4 Replies

8. UNIX for Dummies Questions & Answers

Displaying field of NR, not the line #

Within AWK, how do you display a field of NR? Here's my code: awk '(NR>1) && (P1=$1-w)>=100000 {print "increase of" " " P1*.0000179," " "kW at" " " 'NR*60/431900' " " "minutes" "\n" "change from" " " 'NR-10($1)' " " "kW to" " " 'NR+70($1)' "\n"}{w=$1}' filename I can change NR and print... (3 Replies)
Discussion started by: markymarkg123
3 Replies

9. Shell Programming and Scripting

Shell for displaying specific records from a line.

Input file. GMDCOM.27936 : Process Request <36812974> GMDCOM.27936 : Process Request <36812985> GMDCOM.27936 : Process Request <36812986> GMDCOM.27936 : Process Request <36812987> GMDCOM.27936 : Process Request <36812996> GMDCOM.27936 : Process Request <36812998> GMDCOM.27936 : Process... (14 Replies)
Discussion started by: ghosh_tanmoy
14 Replies

10. Red Hat

Displaying command return in one line

Hello all I have a query (SQL) that returns a rather long field from an Oracle database. The field in question is defined on 400 characters but all these 400 cannot be displayed by the echo command. Thus when I launch the following command: echo "SELECT FIELD01 FROM TABLE_NAME;" | sqlplus -s... (9 Replies)
Discussion started by: S. BASU
9 Replies

LEARN ABOUT SUSE

lintian-info

LINTIAN-INFO(1) 					User Contributed Perl Documentation					   LINTIAN-INFO(1)

NAME

       lintian-info - give detailed information about Lintian's error tags

SYNOPSIS

       lintian-info [log-file...]

       lintian-info --tags tag ...

DESCRIPTION

       The lintian-info command parses the output of the lintian command and gives verbose information about the listed Lintian error tags, parses
       a Lintian override file and gives verbose information about the tags included, or (if given the -t or --tags option) explains a given tag
       or tags.

       If no log-file is specified on the command line, this command expects its input on stdin. Thus, the output of lintian can either be piped
       through lintian-info or a log file produced by lintian can be processed with this command.  (Note, though, that the lintian command has a
       command line option -i to display the same results as lintian-info, so you will not normally need to pipe the output of lintian into this
       command.)

OPTIONS

       -a, --annotate
	   Read from standard input or any files specified on the command line and search the input for lines formatted like Lintian override
	   entries.  For each one that was found, display verbose information about that tag.

       -h, --help
	   Display usage information and exit.

       --profile prof
	   Use the severities from the vendor profile prof when displaying tags.  If the profile name does not contain a slash, the default
	   profile for than vendor is chosen.

	   If not specified, lintian-info loads the best profile for the current vendor.

	   Please Refer to the Lintian User Manual for the full documentation of profiles.

       -t, --tags
	   Rather than treating them as log file names, treat any command-line options as tag names and display the descriptions of each tag.

EXIT STATUS

       If -t or --tags was given and one or more of the tags specified were unknown, this command returns the exit code 1.  Otherwise, it always
       returns with exit code 0.

SEE ALSO

       lintian(1)

AUTHORS

       Niels Thykier <niels@thykier.net>

       Richard Braakman <dark@xs4all.nl>

       Christian Schwarz <schwarz@monet.m.isar.de>

perl v5.14.2							    2013-02-16							   LINTIAN-INFO(1)
All times are GMT -4. The time now is 01:59 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy