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Top Forums Shell Programming and Scripting Should pick latest file within past 3 days using UNIX script and perform steps in message below. Post 303008779 by Don Cragun on Wednesday 6th of December 2017 02:53:57 AM
Old 12-06-2017
Quote:
Originally Posted by sunnykamal59
Hopefully this will be my last question .

1)If we have multiple set of files in a folder like below, how we are looping each file for doing comparison?

Code:
abc_20171204.052389.dat
abc_20171203.052428.dat
abc_20171202.052628.dat


2)for looping are we doing below logic in script?

Code:
for file in *_*_*.dat
do
   FILESTAMP=${file#*_}
   FILESTAMP=${FILESTAMP%_*}


3)if so can you please explain the above code with an example?
In all of your early posts you said that files were named using the pattern abc_YYYYMMDD_hhmmss.dat and the code that RudiC suggested processes the files that match the pattern you supplied.

When you then try running the code he suggested in a directory that doesn't have any files that match that pattern, the code won't find any files that match the pattern you told us all that you wanted to process. This is a classic example of what happens when you supply sample data that doesn't match your real data.

Feel free to modify the code RudiC suggested to match the format of the real filenames you are trying to process. Do not blame RudiC for supplying code that looked for what you said should be looked for when no files in that format are present.

To make the code match the latest sample names you have provided, you'll need to change the filename matching pattern in the for statement and change the parameter expansion that is used to extract the date from the expansion of the shell FILESTAMP variable.
 

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EvmEventNameMatch(3)					     Library Functions Manual					      EvmEventNameMatch(3)

NAME
EvmEventNameMatch(), EvmEventNameMatchStr() - match EVM event name SYNOPSIS
Library EVM Support Library Parameters pattern The event name pattern sought. The pattern may be any valid event name string. It may include wildcard characters in place of any component. event The event containing the event name to be compared against the pattern. match The result of the match. This operand is set to if the name matches the pattern, and to if it does not. candidate A character string to be matched against the pattern DESCRIPTION
Because special matching rules apply when deciding whether a candidate event name matches a known name, the EVM name matching functions should be used for matching purposes, rather than the C string comparison functions The EVM functions match an event name against a sup- plied pattern, ignoring any trailing appended components in the candidate name, and correctly matching wildcard characters. The function takes an event and an event name pattern as input, and returns an indication of whether the event contains a name which matches the pattern in the match output argument. The pattern may be any valid event name string, and may also include wildcard characters in place of any component. A wildcard in the pattern matches zero or more name components. A matches exactly one component. A match occurs if the event name matches all components indicated by the pattern, even if the name has additional trailing elements. The function performs the same check as but takes a character string as the candidate event name, instead of extracting the candidate event name from a supplied event. Both functions set the match output argument to if the name matches the pattern, and to if it does not. RETURN VALUE
The operation completed without error. The comparison was successful. The value of the match operand indicates whether the name matches the pattern. One of the arguments to the function is invalid. The supplied pattern contains invalid characters. The supplied event does not contain a name. ERRORS
The value of is not set. SEE ALSO
Routines memccpy(3C), strcat(3C). Event Management EVM(5). EVM Events EvmEvent(5). EvmEventNameMatch(3)
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