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Shell Programming and Scripting

string manipulation issue

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# 1  
Old 11-20-2008
string manipulation issue
I have myMethod that gives me available,used,free disk space in KB. I parse the used disk space using awk. That gives me something like 830,016. I want the output to be 830016 so that I can add 100000 to it. In other words I would like to use used_space variable in numeric calculations (using expr).

Code:
.....
myMethod
used_space="`myMethod | grep sum | awk -F' ' '{print $3}'`"
echo $used_space
echo ${used_space/,/}

But the last line above gives me error:
Code:
sum                 1,977,920      830,016    1,147,904
830,016
./test.sh: bad substitution

What can I do? If I do the same thing on command line it works fine!
Code:
bash-3.00# export abc=830,123
bash-3.00# echo ${abc/,/}
830123
bash-3.00#

# 2  
Old 11-20-2008
Quote:
Originally Posted by illcar
Code:
used_space="`myMethod | grep sum | awk -F' ' '{print $3}'`"

Let awk do the job and don't get complicated.
Code:
used_space=`myMethod | awk '/sum/{gsub(/,/,"");print $3}'`

# 3  
Old 11-20-2008
I guess you havn't specify the shell in script. (Do not remember how that line is named..)
First line in script
Code:
#! /usr/bin/bash

for example.

In bash it works fine, but I have tried it in ksh:
Code:
> ec $used_space
830,016
> ec ${used_space/,/}
ksh: ${used_space/,/}: bad substitution
>

# 4  
Old 11-21-2008
I am sorry, I am still having issues. I changed the code as follows:

Code:
 
myMethod
used=`myMethod | awk '{gsub(/,/,""); print $3}'`
echo $used

Now I get a different error. If it is not clear what could be wrong, any pointers for debugging awk would be appreciated.

Code:
 
bash-3.00# ./test.sh 
sum                 1,977,920      795,648    1,182,272
awk: syntax error near line 1
awk: illegal statement near line 1
bash-3.00# stty: : I/O error

The first line of the script is:
Code:
 
#!/bin/sh

# 5  
Old 11-21-2008
problem is:
1: 'awk' does not know the function 'gsub()'
use 'nawk'
2: why you do not change the 'sh' to 'bash' - everything will be simpler
# 6  
Old 11-24-2008
Quote:
Originally Posted by alex_5161
problem is:
1: 'awk' does not know the function 'gsub()'
use 'nawk'
2: why you do not change the 'sh' to 'bash' - everything will be simpler
Thanks, nawk did the trick.
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