Hi all, new to the forums...

Currently doing some study for my exams, which is an exam on linux / shell scripts where I have multiple choice questions. A few of the questions are catching me out, and I can't find answers in the notes for them. I have been playing around in Fedora 12 with the commands but I'm not getting anything definitive for a few of them.... So hopefully someone can help here...


1. Which refers to the process ID number of the shell you are currently using:
a) $pid
b) $!
c) $id
d) $$

I think this one is $$, but when I login as root user on fedora, and try it... it says the command is not found, and the rest of the commands return nothing....

2. Which of the following will send a hangup signal to process 20692:
a) kill -l 20692
b) kill -9 20692
c) kill -19 20692
d) kill -20 20692

This one confuses me, I don't think it's (a) because kill -l is used to return a list of all the signals, and as for the rest of them... I tried them in fedora and each one returns the same message... so what's the deal with the numbers there, can anyone explain their significance?

3. What command can be used to load a function into memory?
a) source
b) function
c) memf
d) fmem

I have googled each of these commands, none make sense to me. I have also tried to find out about them in fedora, and memf and fmem seem to be fake commands, but I have no clear idea on what the other 2 do...




Thanks for reading,

Kielo

1. Which refers to the process ID number of the shell you are currently using:
a) $pid
b) $!
c) $id
d) $$


This one is definitely D) $$

I didn't use an echo command so it wasn't returning values... Noob mistakes I guess!

Still puzzled on the rest....

Hitting Google with the keywords: gnu bash beginners would give you interesting results!

...
I guess there is a typo in the first option (that should read 1 not l)
and its better to search Google by keywords: gnu signal handling rather than guessing things without knowing the concepts.

These seem to be either Distro specific commands or junk. Well only the
source command has a man page in Suse!
and http://linux.die.net/man/ is a good site to look for man pages.

No, the 'l' for list is fine:

$ kill -l
1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP
6) SIGABRT 7) SIGBUS 8) SIGFPE 9) SIGKILL 10) SIGUSR1
11) SIGSEGV 12) SIGUSR2 13) SIGPIPE 14) SIGALRM 15) SIGTERM
16) SIGSTKFLT 17) SIGCHLD 18) SIGCONT 19) SIGSTOP 20) SIGTSTP
21) SIGTTIN 22) SIGTTOU 23) SIGURG 24) SIGXCPU 25) SIGXFSZ
26) SIGVTALRM 27) SIGPROF 28) SIGWINCH 29) SIGIO 30) SIGPWR
31) SIGSYS 34) SIGRTMIN 35) SIGRTMIN+1 36) SIGRTMIN+2 37) SIGRTMIN+3
38) SIGRTMIN+4 39) SIGRTMIN+5 40) SIGRTMIN+6 41) SIGRTMIN+7 42) SIGRTMIN+8
43) SIGRTMIN+9 44) SIGRTMIN+10 45) SIGRTMIN+11 46) SIGRTMIN+12 47) SIGRTMIN+13
48) SIGRTMIN+14 49) SIGRTMIN+15 50) SIGRTMAX-14 51) SIGRTMAX-13 52) SIGRTMAX-12
53) SIGRTMAX-11 54) SIGRTMAX-10 55) SIGRTMAX-9 56) SIGRTMAX-8 57) SIGRTMAX-7
58) SIGRTMAX-6 59) SIGRTMAX-5 60) SIGRTMAX-4 61) SIGRTMAX-3 62) SIGRTMAX-2
63) SIGRTMAX-1 64) SIGRTMAX

SIGHUP (numbered 1) is the signal for hanging (question is regarding hanging) says http://www.comptechdoc.org/os/linux/...pgsignals.html so...

Ah -1... maybe it's time for me to get glasses, I must of read it wrong!

Thanks for the advice I'll google those and see how I get on.

function doesn't have a man page because it isn't a programme, it's a bash internal command.