Little Trouble Understanding some code...

NycUnxer · #1 (**permalink**) 10-30-2007

Couple of questions as I try to decipher someones code who left...

What would something coded like this do?

IFS=:
grep FIELD1 /Path/Path2/Param.fle | read LBL1 LBL2 USRID EADR SUBJ SERVERNAME CFGTBL DIR
ERR=0

Param.fle contents..
FIELD1:FEI::FIELD2:dATAFIELD BATCH:MAIN SERVER......etc..

jim mcnamara · #2 (**permalink**) 10-30-2007

IFS=: makes a colon the default field separator. By grep FIELD1, the code only finds records with the word "FIELD1" in them, probably just one record.

Next, since IFS is a colon, each of the variables in the read statement will be assigned the value of the corresponding field in the file.
LBL1 will be the first field, ie., FIELD1
LBL2 will be the second FEI
and so on.

You now have several variables defined as the contents of the fields in one record from
Param.fle

NycUnxer · #3 (**permalink**) 10-31-2007

I got you up to LBL2, so then USRID is going to be blank because of the '::' after FEI which if I'm understanding correctly is null since there is nothing in between the colons?

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
how i prepare a c++ code(c code) for implementing my own protocol format	amitpansuria	High Level Programming	1	09-06-2007 11:09 PM
Understanding this Makefile	the_learner	High Level Programming	5	06-14-2007 01:55 AM
Understanding traceroutes	Bobby	IP Networking	2	03-14-2005 05:35 PM
need further understanding of init.d	jigarlakhani	UNIX for Advanced & Expert Users	1	09-20-2002 03:11 PM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by