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Shell Programming and Scripting

How do i get numbers from a string?

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Top Forums Shell Programming and Scripting How do i get numbers from a string?
# 8  
Old 07-18-2007
i put it as an argument when i call the script...
# 9  
Old 07-18-2007
Quote:
Originally Posted by vino
I have a feeling it all boils down to just

Code:
for x in lvol*
do
  echo /dev/$1/$x
  lvdisplay $x | grep MBytes
done

i get this:
Code:
lvdisplay: "lvol*": No such file or directory
Usage: lvdisplay
        [-v]
        [-k]
        LogicalVolumePath...

Smilie
# 10  
Old 07-18-2007
And for this ?

Code:
for x in *
do
      if [ "$x" = lvol* ]; then
        echo $x |  tr -d '[A-Za-z]' | read lvolnum
        echo /dev/$1/lvol${lvolnum} --> Where did you get $1 from ?
        lvdisplay lvol${lvolnum} | grep Mbytes
      fi
done

# 11  
Old 07-18-2007
Quote:
Originally Posted by vino
And for this ?

Code:
for x in *
do
      if [ "$x" = lvol* ]; then
        echo $x |  tr -d '[A-Za-z]' | read lvolnum
        echo /dev/$1/lvol${lvolnum} --> Where did you get $1 from ?
        lvdisplay lvol${lvolnum} | grep Mbytes
      fi
done

nothing...
he does not enter the "if"...
# 12  
Old 07-18-2007
Are you present in the path where the lvol files are present. I hope thats the reason why your are getting the error like

Code:
lvdisplay: "lvol*": No such file or directory

Or it should have been like

Code:
lvdisplay /dev/$1/lvol${lvolnum} | grep Mbytes

# 13  
Old 07-18-2007
Quote:
Originally Posted by eliraza6
i want to make a script that gets a VG name and outputs the size of it's lvols...

here is what i wrote but it doesn't work... Smilie

Code:
for x in *
    do
        if [ "echo $x" = "lvol*" ]; then
    echo $x |  tr -d '[A-Za-z]' | read lvolnum
    echo /dev/$1/lvol$lvolnum
    lvdisplay lvol${lvolnum} | grep Mbytes
        fi
done

can someone please help me?
thanx alot!
Basic question. What does not work ? You also mentioned the run does not enter the if loop. Can you show us the output of
ls *
or even
ls *lvol*
# 14  
Old 07-18-2007
lets start over...

this script works fine

Code:
#! /bin/ksh
cd /dev/$1
for x in *
    do
        echo $x |  tr -d '[A-Za-z]' | read lvolnum
    echo /dev/$1/lvol$lvolnum
        lvdisplay lvol${lvolnum} | grep Mbytes
done

the only problem is that the output apear twice because there is "lvol" directories and "rlvol" directories so he do the "lvdisplay" for both of them...
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