How to: Parse text string into variables using Korn shell

Shell Programming and Scripting
1

I am writing a script to keep check on free disk space, and I would like to find a way to parse $LINE (see code below) into a numeric value (for free disk space percentage) and a string value (for mount point). If possible, I would like to avoid sed or any additional use of awk since I am not very familiar with those utilities. All help is appreciated. Thanks in advance.

ScriptName=$(basename $0)			# Equivalent shorthand code is: ${0##*/}

TempFile_NME=${DBA_TMP}/${ScriptName}.tmp

df -h | grep / | awk '{ print $5, $6 }'>$TempFile_NME

while read LINE
	do
		echo "$LINE"
	done < $TempFile_NME
2

Your script writes out line to the screen. Can you paste a few lines, or all lines, into a follow-up message? Especially since it appears that there is more than one field of information being displayed.
Most likely a cut command can pull the data apart.

3

The data looks like this:

15% /
0% /devices
0% /system/contract
0% /proc
0% /etc/mnttab
1% /etc/svc/volatile
0% /system/object
0% /dev/fd
1% /var/run
50% /s01
40% /s02
20% /u01

Note that the "/" varies in its position. I need to find a way to take that into account.

4 
> cat inputf
15% /
0% /devices
0% /system/contract
0% /proc
0% /etc/mnttab
1% /etc/svc/volatile
0% /system/object
0% /dev/fd
1% /var/run
50% /s01
40% /s02
20% /u01

> cat scan_data 
#! /bin/bash
while read zf
   do
   numb=$(echo "$zf" | cut -d"%" -f1)
   driv=$(echo "$zf" | cut -d"%" -f2)

   drivt=$(printf "%-40s" "$driv")
   numbt=$(printf "%9.3f" "$numb")
   echo "For your disk drive = $drivt ... your percentage full is $numbt"

done<inputf

> scan_data 
For your disk drive =  /                                       ... your percentage full is    15.000
For your disk drive =  /devices                                ... your percentage full is     0.000
For your disk drive =  /system/contract                        ... your percentage full is     0.000
For your disk drive =  /proc                                   ... your percentage full is     0.000
For your disk drive =  /etc/mnttab                             ... your percentage full is     0.000
For your disk drive =  /etc/svc/volatile                       ... your percentage full is     1.000
For your disk drive =  /system/object                          ... your percentage full is     0.000
For your disk drive =  /dev/fd                                 ... your percentage full is     0.000
For your disk drive =  /var/run                                ... your percentage full is     1.000
For your disk drive =  /s01                                    ... your percentage full is    50.000
For your disk drive =  /s02                                    ... your percentage full is    40.000
For your disk drive =  /u01                                    ... your percentage full is    20.000
For your disk drive =                                          ... your percentage full is     0.000
5

Joeyg,

This is wonderful! My background is in VMS scripting, and I've been looking for a Korn equivalent to DCL F$FAO for a long time. This is the closest I've seen.

Thanks for the snippet of code. I have what I need now.

Have a great weekend!

J

6 
numb=$(echo "$zf" | cut -d"%" -f1)

Apparently, numb is a string. Can you tell me how convert it to integer and subtract it from 100? That would let me display the output as % free, rather than % full.

Thanks again!

j

7 
numb=$(expr $zf - 100)

Regards

8

Franklin52,

Thanks! I have something that works now.

J