xiyou.wangcong's articles:

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Why 'break' even has effects outside of its function? 25 30 (3/5/2012 8:23:24 AM) comp.unix.shell Hi, list! I just found an interesting thing which surprised me, that is, why the following "break 2" can even effect the loop outside of the function foo()? bash-4.2$ foo() { local i; for i in 1 2 3; do break... Cong

sed with a shell variable 8 28 (12/16/2011 8:09:18 AM) comp.unix.shell Hello, I have a shell variable which contains '.' in it, and I also use it in an sed expression, for example, foo="eth0.7" sed -e "s/$foo//g" bar.txt The question is, how can I prevent sed interpreting the ... Cong

Shell quote puzzle 9 29 (12/16/2011 8:02:09 AM) comp.unix.shell Hello, shell experts! Today I encountered an interesting problem when I do shell programming. Let me show it like this, [wangcong@cr0]/tmp% cat ./test.sh #!/bin/bash args="a b" ../arg1.sh $args [wangcong@... Cong

Why I always got zero in MRTG? 1 165 (11/12/2008 10:40:39 AM) comp.dcom.net-management Hello, everyone! I met a weird problem when I used MRTG to generate the traffic graph for SNMP. My config file for MRTG is something like this: Target[up-bytes]: 1.3.6.1.4.1.8072.1.3.2.4.1.2.8.117.112.... ISO

less behaves differently in parent and child process 7 37 (8/22/2008 5:37:58 PM) comp.unix.programmer When someone asked me a question about pipe(2), I found a weird problem. The original program which may be picked from somewhere is below: #include #include int main(int argc,char **argv) { int f_des[2];... WANG

grep doesn't know '\xHH' ? 20 75 (8/22/2008 4:59:15 PM) comp.unix.programmer Please see below: $ echo -e '\xde\xad\xbe\xef' > test.txt $ od -t x1 test.txt 0000000 de ad be ef 0a 0000005 $ grep -b -E '\xef' test.txt $ echo $? 1 $ grep --version grep (GNU grep) 2.5.1 I am using Linux ... WANG

Call once,return twice 3 58 (9/4/2005 11:25:50 AM) comp.lang.c Hi,all! I found an interesting problem,it is that how to implement a C function which can be called once and return twice? Just like the POSIX function fork() or the library function longjmp().Only via using ... Cong

xiyou.wangcong's replies:

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Can I put a process in a "network jail", like the "chroot jail" 20 42 (7/17/2011 2:53:23 AM) comp.os.linux.misc I am working on something where I would have processes that handle user contributed data, in a way where I feel that I have to restrict them as much as possible. I wand them to read stdin, and produce stdout an... Ignoramus29044

How to remove unix socket files automatically on abnormal termination 3 59 (11/3/2011 6:07:30 AM) comp.unix.programmer Hi, My app will create a unix socket file on startup, and it will remove it o= n exit. But there are some abnormal situations where the cleanup code can't= be called, such as killed by SIGKILL. For normal ... liguanglei (12)

regexp in rm command. 4 53 (11/18/2011 10:17:15 AM) comp.unix.shell Hi all, Is it possible to use regexp with rm command, e.g., in the following case: When I use the regexp, I will meet the errors: $ touch Ge_opt.summ $ rm Ge.*.summ rm: cannot remove `Ge.*.summ': No such fi... hongyi.zhao (486)

Why C has Pointers. 80 49 (12/7/2011 12:22:56 PM) comp.lang.c hi my Q is on the c language tell me now why c has pointers. parshant -- curixinfotech ------------------------------------------------------------------------ curixinfotech's Profile: http://forums.yourdom... curixinfotech.54dl3z (1)

Shell quote puzzle 9 29 (12/16/2011 8:02:09 AM) comp.unix.shell Hello, shell experts! Today I encountered an interesting problem when I do shell programming. Let me show it like this, [wangcong@cr0]/tmp% cat ./test.sh #!/bin/bash args="a b" ../arg1.sh $args [wangcong@... xiyou.wangcong (255)

sed with a shell variable 8 28 (12/16/2011 8:09:18 AM) comp.unix.shell Hello, I have a shell variable which contains '.' in it, and I also use it in an sed expression, for example, foo="eth0.7" sed -e "s/$foo//g" bar.txt The question is, how can I prevent sed interpreting the ... xiyou.wangcong (255)

shell, console, terminal, tty 2 36 (2/20/2012 8:55:27 AM) comp.unix.shell tty==terminal==console Shell is a program that attached to control a tty/terminal/console. All good? ... lite.on.beta (15)

Help: logger is not valid in trap 1 31 (3/4/2012 5:22:16 AM) comp.unix.shell Hi, Here's my codes: #!/bin/bash echo_random () { file=$1 while true do echo "$(cat /dev/urandom | od -x | tr -d ' ' | head -n 1)" >> $file sleep 1 done } trap 'kill $pid_main $pid_rotate 2> /dev/n... openlinuxsource (112)

Why 'break' even has effects outside of its function? 25 30 (3/5/2012 8:23:24 AM) comp.unix.shell Hi, list! I just found an interesting thing which surprised me, that is, why the following "break 2" can even effect the loop outside of the function foo()? bash-4.2$ foo() { local i; for i in 1 2 3; do break... xiyou.wangcong (255)

how to use volatile key word? #2 34 52 (6/26/2012 4:11:28 PM) comp.lang.c++ how to use volatile key word? Assume I have a global variable shared by two or more tasks. Do I need to declare it as volatile? When will a non-volatile global variable be written back to memory from a r... fuhu314 (16)