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Top Forums Shell Programming and Scripting Show distinct values of a key from a single line Post 302676013 by elixir_sinari on Tuesday 24th of July 2012 02:19:50 AM
Old 07-24-2012
1) The regular expression qry="[^"]*" will match the literal qry=" followed by any number of any characters except a ", and followed by the literal ". This is needed as an expression such as .* will otherwise match as many characters as is possible including ".

2) Since you asked just about RLENGTH-6, I assume that you have idea about the match function and the system variables set by it. The number will depend on what you have as the "label" (qry in this case). As I am advancing the position in substr function by 5 (from RSTART, to match the length of qry-"), the length in substr will be reduced by 5 + 1(for the last ").
 

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GRIB_GET_DATA(1)						   User Commands						  GRIB_GET_DATA(1)

NAME
grib_get_data - Print a latitude, longitude, data values list DESCRIPTION
Print a latitude, longitude, data values list USAGE
grib_get_data [options] grib_file grib_file ... OPTIONS
-M Multi-grib support off. Turn off support for multiple fields in single grib message -m missingValue The missing value is given through this option. Any string is allowed and it is printed in place of the missing values. Default is to skip the missing values. -p key[:{s/d/l}],key[:{s/d/l}],... Declaration of keys to print. For each key a string (key:s) or a double (key:d) or a long (key:l) type can be requested. Default type is string. -R out_file_name Redirect the standard output to "out_file_name". Faster than the shell redirect (>) because buffered. -F format C style format for values. Default is "%.10e" -w key[:{s/d/l}]{=/!=}value,key[:{s/d/l}]{=/!=}value,... Where clause. Grib messages are processed only if they match all the key/value constraints. A valid constraint is of type key=value or key!=value. For each key a string (key:s) or a double (key:d) or a long (key:l) type can be specified. Default type is string. -f Force. Force the execution not to fail on error. -G GRIBEX compatibility mode. -7 Does not fail when the message has wrong length -V Version. AUTHOR
This manpage has been autogenerated by Enrico Zini <enrico@debian.org>from the command line help of grib_get_data. grib_get_data April 2009 GRIB_GET_DATA(1)
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