How to read user defined dictionary using shell scripts?

Question

Say I have a BCFile having the following contents:

inlet
{
    type            fixedValue;
    value           uniform (5 0 0);
}
outlet
{
    type            inletOutlet;
    inletValue      $internalField;
    value           $internalField;
}
....
blahblahblah (other boundary condition with the same dictionary format as above)

In order to print out the type of outlet boundary condition, that is inletOutlet, I thought I could use,

cat BCFile | grep "type" | awk '{printf $2}'  | tr -d ";"

But the problem now is in using grep there are so many type keyword appeared. So is there a way to first detect the word outlet, then search and grep the contents between {}? Thanks!

Joni · Accepted Answer · 2013-04-04 23:06:29Z

1

AWK is pretty powerful. For example if you set the record separator to } each block becomes a record of its own. Then you just print the matching record:

$ awk -v RS='}' '/outlet/ { print $0 }' file
outlet
{
    type            inletOutlet;
    inletValue      $internalField;
    value           $internalField;

answered Apr 4, 2013 at 23:06

Joni

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2 Comments

Daniel Over a year ago

But what if it is inlet, since keyword inlet occurs many times. This method won't work any more. :(

Joni Over a year ago

There's more than one way to do it: you can change the match condition from /outlet/ to /inlet\n{/, or $1 ~ /inlet/, or /^inlet/

bsmoo · Accepted Answer · 2013-04-04 22:54:25Z

0

How about grep -A 5 'outlet' BCFile | grep 'type' | awk '{printf $2}' | tr -d ";"

answered Apr 4, 2013 at 22:54

bsmoo

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