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Yes, you are 100% right, it does create a sparse file. I must have not run du or not at the right moment in the past. I also normally truncate first but it did not always seem to have the desired...

You can:
$ cat truncate.c

#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>

int main(void)
{
int fd=open("filename.txt", O_CREAT|O_WRONLY);
write(fd,"HEY GUYS ALJ...

Not usually. Most UNIX filesystems have 'sparse' files... You can open a new file, seek ahead 99 gigabytes, and write 1 byte there, to get a file that looks like 99 gigabytes in ls, but only takes...

You can find it using

# lsof | grep "(deleted)" # (or lsof | grep (filename))


If it's safe to do so, take the pid from the lsof command, and do:

# ls -l /proc/(pid)/fd # to get the fd# for...

Filenames, like most things in Unix, are case sensitive. Foo is not foo.

add below line to your .profile file (I am still unsure about your requirement)


export PATH=$PATH:<<your application installed path>>

Ok, lets take it one column at a time:
Proto is the protocol used. tcp and udp should be pretty self-explanatory. icm is short for ICMP, which is a network control protocol (pings use ICMP...