Shell Programming and Scripting

20140101.txt
20140102.txt
20131201.txt
20131104.txt

var[0] = 201401
var[1] = 201312
var[2] = 201311

set -A FILES $(ls 201*.txt)

echo ${FILES[0]%.*}

cd /path/to/files
ARRAY=( $(ls|sort) )
C=0 	# counter
while [ $C -lt "${#ARRAY[@]}" ];do
	echo "* $C -- ${ARRAY[$C]}"
	((C++))
done

var=( $(ls -1 *.txt|colrm 6) )

#!/bin/ksh
function pvar {
	i=0
	while [ $i -lt ${#var[@]} ]
	do	printf "var[%d]=%s\n" $i "${var[i]}"
		((i++))
	done
}
printf "Using colrm 6:\n"
var=( $(ls *.txt | colrm 6) )
pvar

printf "\nUsing colrm 7 & sort -nru:\n"
var=( $(ls *.txt | colrm 7 | sort -nru) )
pvar

printf "\nUsing sed & sort -nru:\n"
var=( $(ls *.txt | sed 's/\(......\).*/\1/' | sort -nru) )
pvar

Using colrm 6:
var[0]=20131
var[1]=20131
var[2]=20140
var[3]=20140

Using colrm 7 & sort -nru:
var[0]=201401
var[1]=201312
var[2]=201311

Using sed & sort -nru:
var[0]=201401
var[1]=201312
var[2]=201311