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Full Discussion: For cycle, process order
Top Forums UNIX for Beginners Questions & Answers For cycle, process order Post 303041063 by baris35 on Wednesday 13th of November 2019 09:28:10 AM
Old 11-13-2019
For cycle, process order
Hello,
I am running a script under ubuntu 16.04
I have no problem with the script. My question is general algorithm of for file command.
I just need to know how for file in *.txt process works.

Let's say, I wish to run the script by sorting filename:
Code:
for file in *.txt
do
"do something in alphabetical order"
done

or
Code:
for file in *.txt
do
"do something according to filesize in ascending direction"
done

or another way:
Code:
for file in *.txt
do
"do something in by recently updated file"
done

or
Code:
for file in *.txt
do
"do something by total string length of each filename in descending order"
done

In summarize: If we do not indicate any criteria, what's the default working method of for cycle ?
Thank you
Boris
 

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LEARN ABOUT SUSE

exicyclog

EXICYCLOG(8)						      System Manager's Manual						      EXICYCLOG(8)

NAME

       exicyclog - Cycle exim's logfiles

SYNOPSIS

       eximcyclog

DESCRIPTION

       The  exicyclog script can be used to cycle (rotate) mainlog and rejectlog files.  This is not necessary if only syslog is being used.  Some
       operating systems have their own standard mechanisms for log cycling, and these can be used instead of exicyclog if preferred.

       Each time exicyclog is run the file names get 'shuffled down' by one.  If the main log file name is mainlog (the default) then when  exicy-
       clog is run mainlog becomes mainlog.01, the previous mainlog.01 becomes mainlog.02 and so on, up to a limit which is set in the script, and
       which defaults to 10.  Reject logs are handled similarly.

       If no mainlog file exists, the script does nothing.  Files that 'drop off' the end are deleted.	All files with numbers greater than 01 are
       compressed,  using a compression command which is configured by the COMPRESS_COMMAND setting in Local/Makefile.	It is usual to run "exicy-
       clog" daily from a root "crontab" entry of the form

	 1 0 * * * su exim -c /usr/exim/bin/exicyclog

       assuming you have used the name 'exim' for the Exim user.  You can run exicyclog as root if you wish, but there is no need.

BUGS

       This manual page needs a major re-work. If somebody knows better groff than us and has more experience in writing manual pages, any patches
       would be greatly appreciated.

SEE ALSO

       exim(8), /usr/share/doc/exim4-base/

AUTHOR

       This  manual  page was stitched together from spec.txt by Andreas Metzler <ametzler at downhill.at.eu.org>, for the Debian GNU/Linux system
       (but may be used by others).

								  March 26, 2003						      EXICYCLOG(8)
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