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Hello nirjhar17,

You need not to use cat alnog with awk, awk could read the Input_file itself. It is working for me fine in BASH, following is the Input_file.

cat Input_file
Name:...

The contents of /tmp/devices in your earlier example clearly had two columns of data per line; not one. With the above contents of /tmp/devices, there would be no spacing problem. (The only spacing...

Hi nirjhar17,
To get the output you said you wanted in the 3rd message in this thread (except for inconsistent spacing in the output you showed in the symmask commands), the following shell and awk...

What I said was to do something like below in red.

for (( i=0;i<N;i++ ))
do
echo "enter director and port number"
read dirs[$i] ports[$i]
done
for (( i=0;i<N;i++ ))
do
DIR=dirs[$i]...

\1 is back reference to the sub-pattern in first parenthesis of the pattern. In this case, \(..\) is the sub pattern in first parenthesis. This is referred by \1.

Could you tell us which part of the code you don't understand ?

If you understand nothing, reading the following would be a good start :
...

what is your desired output?
is that or ?
# sed 's/../&:/g;s/.$//' file
50:06:0E:80:05:8F:49:00
50:06:0E:80:05:8F:49:20
50:06:0E:80:05:8F:49:01
50:06:0E:80:05:8F:49:21
50:06:0E:80:05:8F:49:04...

This seems much better to me.



The looping issue might be that you either need to initialise i to 0, or change the conditional to i <= N.

You are seeing the 'c' dropped because of the...

Ok, so you're getting the error after you save the file and when you try to execute it? That makes a bit more sense.



The typeset -a name defines the variable name as an indexed array. ...

I'm confused by what it is you mean when you say "trying to run from vi." Using the :! command vi command? Unfortunately I cannot explain the error you are getting; your script runs without error...