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Top Forums UNIX for Dummies Questions & Answers File updation on matching key Post 302975220 by Don Cragun on Thursday 9th of June 2016 01:20:17 PM
Old 06-09-2016
I'm glad you got it to work. If you'd like to show us how you changed the code to perform the rounding you wanted, we might be able to offer suggestions for alternative ways to do it. (And, having your completed solution in the thread helps others who may have a similar problem in the future if they can see how you solved the problem.)

If field 8 always 6 characters? Or, can the length of that field vary from file to file too? (Making that field variable length isn't complicated, if the length varies.)

Can the original value in field 8 ever appear as the value of field 2, 3, 4, 5, 6, or 7 in any of your input files? (As long as the 1st field is always left aligned and the aren't any empty fields in your input files, it wouldn't be too hard to be sure that field 8 is modified in the output and not an earlier field with the same contents. But, the code is faster and simpler as provided in RudiC's suggestion if this isn't a concern for your input files.)
 

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MEWL(1) 						      General Commands Manual							   MEWL(1)

NAME
mewl - Message scanner for Mew 4 or later SYNOPSIS
mewl [options] [folder [range]] DESCRIPTION
The mewl utility extracts necessary fields from messages stored in folders. This command is necessary for Mew to implement the asynchro- nous feature. The options are as follows: -a Print all necessary fields when picking. -b dir Set the Mail home to dir. -c bodylen Set the max body length to be extracted to bodylen. -d field Set the field to be extracted to field. -e command Specify an external command to fetch mailbox. -m options Specify options for command. -f fields Specify fields to display. -h Display this help message. -i file Set the input stream to file. -l length Set the max field length to be extracted to length. The default value is 3. 0 means no limit. -n Don't use fstat(). -p pattern Specify the pick pattern. -s src Set message source to src : '+folder range'. -w Wait for stdio input to synchronize. -v Display the version. -x suffix Use this suffix. Definitions of the symbols above are as follows: range N | [start]-[end] | last:N pattern 'key=val' | 'key!=val' | '!<pattern>' | '(<pattern>)' | '<pattern>&<pattern>' | '<pattern>|<pattern>' BUGS
If a field is long, only the beginning three lines are extracted by default. March 5, 2003 MEWL(1)
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