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ping error (DUP!)
Post 302561144 by ieth0 on Monday 3rd of October 2011 09:25:18 AM
10-03-2011
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9 More Discussions You Might Find Interesting
1. Programming
Would anyone be so kind to explain to me the function of dup() in UNIX? As far as I am concerned, it duplicates a file descriptor. Under what circumstances would we need to duplicate a file descriptor in a UNIX environment?
Thank you.
vinchen (3 Replies)
Discussion started by: vinchen
3 Replies
2. Programming
I have met this code:
switch(fork()) {
case 0:
close(1);
dup(p);
close(p);
close(p);
execvp(<whatever>);
perror("Exec failed");
}
Can anyone tell me what this piece of code does?
Thx alot.. (1 Reply)
Discussion started by: AkumaTay
1 Replies
3. Programming
I'm having difficulty understanding the purposes of using dup/dup2 when involving forks.
for example, if we call fork() once, that is, we are creating a child process. In what cases would we need to use dup or dup2 to duplicate the file descriptors for standard output and standard error? What... (1 Reply)
Discussion started by: Yifan_Guo
1 Replies
4. Shell Programming and Scripting
Hi, I use this function (now modified with elif) for check if a pc is up: check_pc() {
$PING $PC 1 2> /dev/null
if ; then
check_dir #Other function
echo "Begin backup operation for $PC"
echo "$SMBTAR -s $PC -u $USER -p $PASS -x $SHARE$EXCL -t - | gzip -c >... (3 Replies)
Discussion started by: mbarberis
3 Replies
5. Programming
when i want to replace standard output with output file
int out;
out = open("out", O_WRONLY)p;
dup2(out,1);
What Shall I do in case of appending??? I am using here O_WRONLY TO WRITE.BUT IF i wanna append, whats the word? (5 Replies)
Discussion started by: joey
5 Replies
6. Shell Programming and Scripting
Hi,
I have a requirement where I have to identify duplicates from a file based on the first 6 chars (It is fixed width file of 12 chars length) and whenever a duplicate row is found, its original and duplicate row's last 2 chars should be updated to all 0's if they are not same. (I mean last 2... (3 Replies)
Discussion started by: farawaydsky
3 Replies
7. Shell Programming and Scripting
Hi Gurus,
I need to count the duplicate records in file
file
abc
abc
def
ghi
ghi
jkl
I want to get below result:
abc ,2
abc, 2
def ,1
ghi ,2
ghi, 2
jkl ,1
or
abc ,2
def ,1 (3 Replies)
Discussion started by: ken6503
3 Replies
8. Programming
help with bash script!
im am working on this script to make sure my server will stay online, so i made this script..
HOSTS="192.168.138.155"
COUNT=4
pingtest(){
for myhost in "$@"
do
ping -c "$COUNT" "$myhost" &&return 1
done
return 0
}
if pingtest $HOSTS
#100% failed... (4 Replies)
Discussion started by: mort3924
4 Replies
9. UNIX and Linux Applications
The problematic directory is the following:
/root/.cache/deja-dup
This directory grows until my "/" is full and then the restoring activity fails.
I already tried to create a symbolic link with origin another partition where I have more space. However during the restoring activity ... (4 Replies)
Discussion started by: puertas12
4 Replies