= chgkwval = 
Changes the keyword value within the keyword list to value specified.

== Usage ==
{{{
chgkwval <keywordlist_file> <keyword> <value>
}}}

== Example ==
Changes the keyword value of area.size to pixels 7689 8031
{{{
chgval band1.spec area.size "pixels 7689 8031"
}}}

== Notes ==

 1. Use no colon ":" after the keyword.
 1. If the keyword is present in the keyword list it will be overwritten.
 1. If the keyword is not in the keyword list it will be added.
 1. Enclose value in double quotes if it is more than one string.