Question

I m new to shell scripting, right now using csh and let s say I have a line in my configuration file like this:

127.0.0.1:2222 127.0.0.2:3333 127.0.0.3:4444

All I want is to parse it for two variables in array :

2222 3333 4444

And another one

127.0.0.1 127.0.0.2 127.0.0.3

Answer 1

Read C Shell Programming Considered Harmful .

How do you get the right line in the configuration file? I m about to assume there s just the one line in the file, but as long as you can identify the line, there are ways to do it.

set var1=`sed  s/[0-9.]*:([0-9]*)/1/g  config.file`
set var2=`sed  s/([0-9.]*):[0-9]*/1/g  config.file`

The first captures the port numbers after the dotted-decimal addresses. The second captures the addresses. In each case, the result is assigned to a string with spaces separating the values.

Some more manual bashing (on MacOS X 10.5.8 - man csh prints the tcsh page) suggests you might be after:

set arr1=(`sed  s/[0-9.]*:([0-9]*)/1/g  config.file`)
set arr2=(`sed  s/([0-9.]*):[0-9]*/1/g  config.file`)

With this notation (the parentheses around the back-quoted sed command), you create arrays, and can use:

echo $arr1[1]
echo $arr1[2]
echo $arr1[3]
echo $arr2[1]
echo $arr2[2]
echo $arr2[3]

(assuming the sample data). The part of the manual page where this is noted marks the syntax with (+) which might well mean extension to standard C shell , so whether this works for you may depend on your environment.

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