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Full Discussion: problems with arrays
Top Forums Shell Programming and Scripting problems with arrays Post 302228873 by alirezan on Monday 25th of August 2008 05:43:28 PM
Old 08-25-2008
problems with arrays
Hi guys,

I want to extract the start and end cylinders of each partition from output of "fdisk -l". I tried to dump the info in an array and then extract from there. Here's the code I have written so far:

Quote:
sizes=`fdisk -l | grep "Linux"` #s
sizes_expanded=$(echo $sizes | sed 's/\(.\)/\1/g') #e
sizes_array=($sizes_expanded) #a

for i in $(seq 0 $(((${#sizes_array[*]} - 1)/6))); do
start_size=$(((6*$i) + 1))
echo "Start addresses = sizes_array[$i]=\"${sizes_array[(((6*$i) + 1))]}\""
done

ends=`fdisk -l | grep "Linux"` #s
ends_expanded=$(echo $ends | sed 's/\(.\)/\1/g') #e
ends_array=($ends_expanded) #a

for i in $(seq 0 $(((${#ends_array[*]} - 1)/6))); do
start_size=$(((6*$i) + 1))
echo "End addresses = ends_array[$i]=\"${ends_array[(((6*$i) + 2))]}\""
done

#########################################################################
#Now calculate the size from the start and end addresses
#########################################################################

declare -a size_arr
for k in $(seq 0 $(((${#sizes_array[*]} - 1)/6))); do
size_arr[$k]=$(($ends_array[$k]-$size_array[$k]))
echo $size_arr[$k]
done
exit 0
and here's the output:

Quote:

Succeeded! Disks found on this machine
Number of Disks on this machine: 2
/dev/hda
/dev/hdd
Start addresses = sizes_array[0]="1"
Start addresses = sizes_array[1]="1001"
Start addresses = sizes_array[2]="2940"
Start addresses = sizes_array[3]="4879"
Start addresses = sizes_array[4]="5849"
Start addresses = sizes_array[5]="8781"
Start addresses = sizes_array[6]="10720"
Start addresses = sizes_array[7]="7788"
Start addresses = sizes_array[8]="1"
Start addresses = sizes_array[9]="3877"
Start addresses = sizes_array[10]="7753"
End addresses = ends_array[0]="1000"
End addresses = ends_array[1]="2939"
End addresses = ends_array[2]="4878"
End addresses = ends_array[3]="5848"
End addresses = ends_array[4]="7787"
End addresses = ends_array[5]="10719"
End addresses = ends_array[6]="16644"
End addresses = ends_array[7]="8036"
End addresses = ends_array[8]="3876"
End addresses = ends_array[9]="7752"
End addresses = ends_array[10]="10859"
./part: line 67: /dev/hda1[0]-[0]: syntax error: operand expected (error token is "/dev/hda1[0]-[0]")
I am trying to subtract the start and end cylinders to find how long each partition is in terms of cylinders. I want to put that in an array too, but I can't seem to get the right output! Can someone please take a quick look at the code and tell me what I am doing wrong?

Thank you
 

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LEARN ABOUT DEBIAN

sctp_getpaddrs

SCTP_GETPADDRS(3)					     Linux Programmer's Manual						 SCTP_GETPADDRS(3)

NAME

       sctp_getpaddrs - Returns all peer addresses in an association.

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>
       #include <netinet/sctp.h>

       int sctp_getpaddrs(int sd, sctp_assoc_t assoc_id,
			  struct sockaddr **addrs);

       void sctp_freepaddrs(struct sockaddr *addrs);

DESCRIPTION

       sctp_getpaddrs  returns	all peer addresses in an association. On return, addrs will point to a dynamically allocated packed array of sock-
       addr structures of the appropriate type for each address. The caller should use sctp_freepaddrs to free the memory. Note  that  the  in/out
       parameter addrs must not be NULL.

       If sd is an IPv4 socket, the addresses returned will be all IPv4 addresses. If sd is an IPv6 socket, the addresses returned can be a mix of
       IPv4 or IPv6 addresses.

       For one-to-many style sockets, id specifies the association to query. For one-to-one style sockets, id is ignored.

       sctp_freepaddrs frees all the resources allocated by sctp_getpaddrs.

RETURN VALUE

       On success, sctp_getpaddrs returns the number of peer addresses in the association. If there  is  no  association  on  this  socket,  0	is
       returned and the value of *addrs is undefined. On error, sctp_getpaddrs returns -1 and the value of *addrs is undefined.

SEE ALSO

       sctp(7)	  sctp_bindx(3),   sctp_connectx(3),   sctp_sendmsg(3),   sctp_send(3),   sctp_recvmsg(3),   sctp_peeloff(3),	sctp_getladdrs(3),
       sctp_opt_info(3),

Linux 2.6							    2005-10-25							 SCTP_GETPADDRS(3)
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