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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 CENTOS

atmaddr

ATMADDR(8)						       Maintenance Commands							ATMADDR(8)

NAME

       atmaddr - list and maintain local ATM addresses

SYNOPSIS

       atmaddr [-n] [itf]
       atmaddr -r [itf]
       atmaddr -a [itf] atm_addr
       atmaddr -d [itf] atm_addr
       atmaddr -V

DESCRIPTION

       atmaddr	is  used  to list the local addresses configured for ATM interfaces and to manually change the list of addresses. If the interface
       number itf is omitted, interface 0 is used by default. The ATM address atm_addr can be any valid ATM SVC address, e.g. an E.164 address	or
       an ATM Forum NSAP address.

       If invoked without options, atmaddr lists the addresses that are currently configured on the specified interface.

       Note that local ATM addresses are normally automatically maintained by the ILMI demon.

OPTIONS

       -a     append the specified address at the end of the list.

       -d     delete the specified address from the list.

       -n     numeric address output only. No address to name translation is attempted.

       -r     reset (clear) the local address list of the specified interface.

       -V     print the version number of atmaddr on standard output and exit.

AUTHOR

       Werner Almesberger, EPFL ICA <Werner.Almesberger@epfl.ch>

SEE ALSO

       ilmid(8)

Linux								  April 26, 2000							ATMADDR(8)
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