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stf92 08-09-2010 08:17 PM
A question about shell scripts.
 
Hi:

Code:
CODECSDIR=${CODECSDIR:-/usr/lib/codecs}
Could somebody tell me what the value of CODECSDIR will be after the line is executed/interpreted? This is the first time in the script where the variable CODECSDIR appears. Thanks in advance.

EDIT: also, when I am in the prompt, echo $CODECSDIR outputs nothing.

jlinkels 08-09-2010 08:42 PM
Because $CODECSDIR didn't exist yet it has been assigned a deafult value.

http://tldp.org/LDP/abs/html/refcards.html#AEN22008

Code:
jlinkels@jlinkels-lt:/tmp$ CODECSDIR=${CODECSDIR:-/usr/lib/codecs}
jlinkels@jlinkels-lt:/tmp$ echo $CODECSDIR
/usr/lib/codecs
jlinkels

stf92 08-09-2010 09:01 PM
Thank you. Your post has been very useful. Regards.


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