Shell Programming and Scripting

-rw-rw-r-- 1 rails rails  8463005 Jul 27 04:02 find_or.log.3.gz
-rw-rw-r-- 1 rails rails 33786339 Jul 27 04:02 pro.log.10.gz
-rw-rw-r-- 1 rails rails 44815467 Aug  3 04:02 pro.log.9.gz
-rw-rw-r-- 1 rails rails 81562896 Aug  4 04:02 pro.log.8.gz
-rw-rw-r-- 1 rails rails 80073289 Aug  5 04:03 blap.log.7.gz
-rw-rw-r-- 1 rails rails  8867231 Aug  6 04:02 fea_or.log.2.gz
-rw-rw-r-- 1 rails rails 81441609 Aug  6 04:03 pro.log.6.gz
-rw-rw-r-- 1 rails rails 72789502 Aug  7 04:03 pro.log.5.gz

-rw-rw-r-- 1 rails rails 44815467 Aug  3 04:02 pro.log.9.gz

for i in `ls *.gz`;

do
DAT=`ls -l $i  | awk '{print $6 $7}'`

Here I need a logic on how to convert $DAT values to equivalent 20120803
into say $NDAT

FN=`ls $i | cut -d'.' -f1`

mv $FN $FN.log-$NDAT.gz
done

#!/bin/ksh
cm=$(date +%m)	# current month as 2 deciml digits
cy=$(date +%Y)	# current year as 4 or more decimal digits
ec=0		# final exit code
ly=$((cy - 1))	# last year as 4 or more decimal digits
typeset -A m	# translation table abbreviated month name -> 2 digit month
m[Jan]=01; m[Feb]=02; m[Mar]=03; m[Apr]=04; m[May]=05; m[Jun]=06
m[Jul]=07; m[Aug]=08; m[Sep]=09; m[Oct]=10; m[Nov]=11; m[Dec]=12
for i in *.log.*.gz
do
	$ According to POSIX, the last command in a pipeline MAY be run
	# in a separate shell execution environment.  It is forced into
	# a separate execution environment here by the $(...) to make it
	# portable to any system.  The $(...) returns the value of $ec
	# it isn't exported to the execution environment of the rest of
	# this script otherwise.  If any errors are reported in the
	# subshell, their diagnostics are written to stderr (file
	# descriptor 2).  No output from the subshell is written to
	# stdout (file descriptor 1).  Note that if the move command is
	# commented out and replaced by an echo, the echo output must be
	# written to stderr!  POSIX allows shells to run the last
	# command in a mult-command pipeline in the current shell
	# execution environment as an extension.
	ls -l "$i" | ec=$( read x x x x x mnth day time file
	if [ "$file" == "" ] # only true if ls failed
	then 	printf "%s: ls failed: \"%s\"\n" "$0" "$i" >&2
		if [ $ec -eq 0 ] # preserve exit code from a failed mv command
		then	ec=100
		fi
		echo $ec
		continue
	fi
	mon=${m[$mnth]}
	if [ "${time%:+([0-9])}" == "$time" ]
	then	# No <colon> in $time means $time is a year instead of a time
		# because the date is in the future or more than six months old.
		year=$time
	elif [ "$mon" -gt $cm ]
	then	# $mon > $cm in the current year, assume it is last year
		year=$ly
	else	year=$cy # otherwise, year is assumed to be current year
	fi
	new="$(printf "%s.log-%d%02d%02d.gz" "${file%%.log.*.gz}" \
	    $year $mon $day)"
	if [ -e "$new" ] # true if $new already exists
	then	# print diagnostic; could concatenate log files instead
		printf "%s: target exists: mv \"%s\" \"%s\" not executed\n" \
		    "$0" "$file" "$new" >&2
		if [ $ec -eq 0 ] # preserve exit code from a failed mv command
		then	ec=101
		fi
		echo $ec
		continue
	fi
	# exactly one of the next two lines must be a comment (# in column 1)
#	mv "$file" "$new"
	echo mv "$file" "$new" >&2
	save=$?
	if [ $save -ne 0 ]
	then	printf "%s: mv failed: mv \"%s\" \"%s\"\n" /
		    "$0" "$file" "$new" >&2
		ec=$save
	fi
	echo $ec)
done
exit $ec

stat --printf "%x %n" filename

2012-08-14 15:58:24.895007883 +0200 filename

stat --printf "%x %n" filename

stat: illegal option -- -
usage: stat [-FlLnqrsx] [-f format] [-t timefmt] [file ...]