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extracting values from configuration file

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# 1  
Old 02-28-2011
extracting values from configuration file
Dear All,

i am new to shell scripting, I am working on embedded system based on linux.I am supposed to the read the configuration file and edit another file.
presently I would like to read from the configuration file.It would be having values file one below.

There is chance of entering duplicate variable in configuration file however I need to extaract only the last entered value.

example file.conf
Code:
ChangeVersion=0
IPAddress=192.168.1.195
GATEIPAddress=192.168.1.1
WebServerIP=192.168.1.106
IPAddress=192.168.1.201
IPAddress=192.168.1.223

I need to extarct the change version,GATEIPAddress and IPAddress which comes as the last entry. How we can achive this.

Thanks in Advance,
Ratheendran

Moderator's Comments:
Mod Comment Please use [code] and [/code] tags when posting code, data or logs etc. to preserve formatting and enhance readability, thanks.
Last edited by zaxxon; 02-28-2011 at 08:48 AM.. Reason: code tags
# 2  
Old 02-28-2011
You could source the file. the duplicates will always have the last entry since it overwrites the previous entry.

Code:
. file.conf
or
source file.conf

# 3  
Old 02-28-2011
See if this would work for you:
Code:
sed -n -e '/ChangeVersion/p' -e '/GATEIP/p' -e '$p' inp_file

# 4  
Old 02-28-2011
Code:
# cat tst
ChangeVersion=0
IPAddress=192.168.1.195
GATEIPAddress=192.168.1.1
WebServerIP=192.168.1.106
IPAddress=192.168.1.201
IPAddress=192.168.1.223

Code:
# nawk '/^IPAddress/{x=$0}/GATE/||/Version/{print}END{print x}' tst
ChangeVersion=0
GATEIPAddress=192.168.1.1
IPAddress=192.168.1.223

Code:
# nawk -F= '/ChangeVersion/||/IPAddress/{A[$1]=$2}END{for(i in A) print i"="A[i]}' tst
GATEIPAddress=192.168.1.1
ChangeVersion=0
IPAddress=192.168.1.223

if it is sure that IPAddress is in last line then
Code:
# nawk '{x=$0}/GATE/||/Version/END{print x}' tst
ChangeVersion=0
GATEIPAddress=192.168.1.1
IPAddress=192.168.1.223

Last edited by ctsgnb; 02-28-2011 at 12:25 PM..
# 5  
Old 03-01-2011
Thanks every one for your response.

I guess I need to make the requirements more clear.

I would like to get the values from config file and store them to a variable,since the chances of entering the duplicate fields are obvious.



Code:
 
#cat tst

Code:
WebServerIP=192.168.1.106       
ChangeVersion=0                      
IPAddress=192.168.1.195              
GATEIPAddress=192.168.1.1            
GATEIPAddress=192.168.1.102            
WebServerIP=192.168.1.106            
IPAddress=192.168.1.201              
IPAddress=192.168.1.223              
HiSpeedNet=1                         
HiSpeedNet=2



so I need to retrieve last entered field and store it in a variable for subsequent manipulation.
e.g HiSpeedNet=2, IPAddress=192.168.1.223, GATEIPAddress=192.168.1.102 ..etc.
# 6  
Old 03-01-2011
Could this help you ?
Code:
awk -F"=" '{b[$1]=$0;next} END{for(i in b) {print b[i]}}' testfile

# 7  
Old 03-01-2011
Quote:
Originally Posted by Ratheendran

so I need to retrieve last entered field and store it in a variable for subsequent manipulation.
e.g HiSpeedNet=2, IPAddress=192.168.1.223, GATEIPAddress=192.168.1.102 ..etc.
The first response is the answer you're looking for. See post #2 by anchal_khare.

Regards,
Alister
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