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UNIX Script Help

Posted on 2014-01-30
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Last Modified: 2014-02-04
Hello,

I need some help in writing a shell script, So if i have

echo "Enter the disks name: "
read DISK

Then what ever disk name I type in is assigned to the variable DISK.

But if I have a file, which has disks
#cat file
hdisk1
hdisk2
hdisk3
hdisk4

So how do i script to "read" the disks in a file...??
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Question by:aanya247
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8 Comments
 
LVL 84

Accepted Solution

by:
ozo earned 400 total points
ID: 39822219
cat > Q_28352688.sh << END
echo "Enter the disks name: "
read DISK
echo $DISK
END

sh Q_28352688.sh < file

for D in `cat file` ; do echo $D | sh Q_28352688.sh ; done
0
 

Author Comment

by:aanya247
ID: 39822382
Thanks OZO for your response....

I didnot quite understand, What is Q_28352688.sh, I only have one file 'file' in which i have disks. I am sorry I am still in a learning phase..
0
 
LVL 35

Assisted Solution

by:Dan Craciun
Dan Craciun earned 100 total points
ID: 39822420
It's called a here document and basically inserts into Q_28352688.sh whatever follows until it reaches END.

HTH,
Dan
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LVL 84

Expert Comment

by:ozo
ID: 39822442
I don't know the name of your shell script or what else you have in it,
so for illustrative purposes, I created one in order to demonstrate some ways to read DISK from file
0
 
LVL 48

Expert Comment

by:Tintin
ID: 39822597
Easier to do

cat file | xargs yourscript.sh
0
 
LVL 84

Expert Comment

by:ozo
ID: 39822627
xargs yourscript.sh
might work with
DISK=$1
but not with
read DISK
0
 
LVL 8

Expert Comment

by:Surrano
ID: 39831906
the `cat ...` method may fail with large lists (something like 2M which is not *that* much) since a command line can't have arbitrary length.

Strange that nobody came up with while read (please don't reopen the question):

cat file | while read DISK; do
  echo $DISK
done

Open in new window

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Author Comment

by:aanya247
ID: 39833155
Thank you...
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