Call external application

3saul · 01-11-2006, 07:30 PM

I'm wanting to call sed from and have its stdout given to a variable in my program. How do I call external applications?

gilead · 01-11-2006, 08:06 PM

If the file files.txt contains

Quote:

cryptostore
QHStore
securedFile

And the following is run:

Code:

export NEWVAR=`sed -r -e '/^[^Q]/d' files.txt`

Then the result is:

Code:

echo $NEWVAR
QHStore

Basically, the `` notation runs a command for you. You can also use $(command) notation. There's more info in `man bash` under Command Substitution.

3saul · 01-11-2006, 08:37 PM

And how would I do that in C?

gilead · 01-11-2006, 08:52 PM

ouch - no fair, I don't use the C shell. Try:

Code:

setenv NEWVAR `sed -r -e '/^[^Q]/d' files.txt`

3saul · 01-11-2006, 08:56 PM

No I meant in the C programming language!...but thanks for the reply!

gilead · 01-11-2006, 09:09 PM

Now you've really got me beaten - C?

Code:

./configure && make && make install

Now what?