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shell 建立檔案,並且檔案序號遞增

#!/bin/bash 

FILE_NAME="2018_2_2-0.txt"

NEW_FILE=`ls -rt | sed '/sh/d' | tail -n1`
echo $NEW_FILE
var=`echo ${NEW_FILE}|awk -F '-' '{print $2}'|awk -F '.' '{print $1}'`
echo $var

TODAY=`date +"%-Y_%-m_%-d"`
let var+=1
echo "var = $var"
cp $NEW_FILE ${TODAY-NEW}-${var}.txt