getting data from config file

esham · #1 (**permalink**) 11-18-2005

pls help..

I need to get the ESSID value for athx

this is the config file..
pls help

Quote:

[ath0]
ESSID=open
MODE=managed
[ath1]
ESSID=wep
MODE=wep

vino · #2 (**permalink**) 11-18-2005

Try this.

Code:

[~/temp]$ cat esham.txt 
[ath0]
ESSID=open
MODE=managed
[ath1]
ESSID=wep
MODE=wep

Code:

[~/temp]$ cat esham.ksh 
#! /bin/ksh

sed -n -e '/\[ath[0-9]\]/{
N
s#ESSID=\(.*\)#\1#p
}' esham.txt

Code:

[~/temp]$ ./esham.ksh
[ath0]
open
[ath1]
wep
[~/temp]$

vino

vino · #3 (**permalink**) 11-18-2005

Better yet...

Code:

[~/temp]$ cat esham.ksh 
#! /bin/ksh

sed -n -e '/\[ath[0-9]\]/{
N
s#.*\(ath[0-9]\).*\nESSID=\(.*\)#\1=\2#p
}' esham.txt

Code:

[~/temp]$ ./esham.ksh 
ath0=open
ath1=wep

esham · #4 (**permalink**) 11-19-2005

can you please explain the usage, how sed is used here.

hope posetive answering
esham

esham · #5 (**permalink**) 11-19-2005

sorry, there is one problem...

the file may have some interfaces like eth0 or ath0..

ie, my file looks like this

Quote:

[ath0]
ESSID=open
MODE=managed
[xyz]
ESSID=shared
MODE=adhoc
[rfg]
ESSID=wepopen
MODE=wep_open

please change the sed arguments according to this..
thanks for ur help

vino · #6 (**permalink**) 11-20-2005

Your sed statement should now be

Code:

sed -n -e '/^\[.*]/{
N
s#^\[\(.*\)\]\nESSID=\(.*\)#\1=\2#p
}' esham.txt

Read it as:

- for any line starting with [ followed by some combination of characters and then a closing ]
- append the next line into the pattern space
- For the two lines that are present in the pattern space, collect the interfaces and its value and print it.
- Read the entries from esham.txt

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