vim gdb misc



1 e.g.

grep -l "ERROR:" *.log

to recursively search in a directory is as,

grep -r "LOG" *
where -r means recursively, * means match any file in current directory,

2

Q:
I have a small program, test.c. It runs OK. This is on Linux (kernel
2.6.8.1, GCC 3.4.1).

I decided to convert it to C++ before expanding it to a larger program. I
changed the filename to test.cpp and added

extern "C" {
}

around main and all the non-static subroutines. It compiles OK, but when I
link it, it says:

test.o (.eh_frame+0x11): undefined reference to '__gxx_personality_v0'
A:
use g++ to link

3

in vim, there's a xxd as an external program.
vim foo
:%!xxd

4

An exam from TLCL handbook (where TLCL= The Linux Command Line)
[me@linuxbox ~]$ diff -c file1.txt file2.txt
*** file1.txt 2008-12-23 06:40:13.000000000 -0500
--- file2.txt 2008-12-23 06:40:34.000000000 -0500
***************
*** 1,4 ****
- a
b
c
d
--- 1,4 ----
b
c
d
+ e

5 MPEG PES has been supported in wireshark

But the packet is inside UDP, not support that inside TCP.
There are also MPEG PES sample in wireshark official site.

6 gdb

x /16xb 0x8ae64de

16=length of memory
x = format, like printf(format)
b = binary

the result is as
0x47    0x00    0x11    0x17    0x1d    0x01    0xbb    0x01

7 vim how to search

1 search a word "word", use:/word, when found, use "n" or "N" or "3N" to go to next/previous one
2 search a word "word" ignore the case, use
:set ignorecase
/word
to set back, use
:set noignorecase