shell script (again)

LoLth

right, this what I've got of a shell script so far:

host=%1
da='date +%y%m%d'
cc=0

until $cc=5
do
if (ping -c 1 xxx.xxx.xxx.xxx > /dev/null ) 
then
sleep 120
else
break

cc=(($cc)+1)
echo attempt $cc

echo
echo connecting to [$host]
ssh [$host]

that's the first section of it. the rest is still in the works. now, I keep getting an error that "cc=" in line 13 is unexpected... I've tried every variation I can think of. I know it's probably soemthing very basic but I can't think what it could be.

any help?

ps. it's bourne shell (sh) by the way... I know someone said use Cshell but I don't know any C at all and this is what I was asked to do it in.

Bosco

Heya LoLth,

I may be wrong but shouldn't the bit after the equals (=) sign be inside quotes? (like line 2)

Bosco

Bosco

Me again,

...not just ordinary quotes mind you but upquotes (top-left on the keyboard).

Bosco

Tom Dunne

What type of c compiler (if any) does the system have? I know gcc is the gnu c compiler, but I have seen some Unix systems where cc is the c compiler (non-gnu, of cource). I have a VMS system here beside me, and sure enough cc is the c compiler.

Have you tried another variable name?

Of course I could be completely way off here...

TD.

Tom Dunne

Please completely disregard my ranting in the previous post. I missed the '1' in 13 and thought the problem was in line 3 (cc=0). I have now read LoLth's post properly and see that my attempt to help has made me look a complete spanner. :eek:

Having said that, I did have a similar problem when writing a shell script before.

Too much VMS, not enough sleep....

TD.

moist

Originally posted by LoLth

cc=(($cc)+1)

That should be cc=$(($cc+1)) I believe.
You could also use somting like cc=`expr $cc + 1` using backquotes, the quote beside the number 1.
Although I prefer the $(( )) way.
Also you have to close your if statement with a fi .

The syntax is...

if (something)
then
	blah blah
else
	yadda yadda
fi

ps. it's bourne shell (sh) by the way... I know someone said use Cshell but I don't know any C at all and this is what I was asked to do it in.

There is not a whole lot of difference with shall scripts in sh and csh, all they are are strings
of different commands stuck together in a file.
csh is syntacticly like C, hence the name
but you are still using if/test/echo/ping/whatever
commands in there.

Bosco

Moist,

Ahhhh... apologies, I was mistaken. So 'back quotes' are only used when you want to store the output of a command in a variable?? (Or am I wrong again? )

Bosco

moist

Originally posted by Bosco

Ahhhh... apologies, I was mistaken. So 'back quotes' are only used when you want to store the output of a command in a variable?? (Or am I wrong again? )

Eh, kinda, you use them when ever you want to use the output from a particular command(s).
Like, say you want to delete all gif's in a directory but want to keep one,
you could go around rm'ing them one by one, or...
rm `ls *.gif | grep -v file_i_want_to_keep.gif`

and things and stuff....

Bosco

You learn something new every day I suppose

Thanks moist