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try this,"file" is the input file
sed 's/\(.\)/\1 /g' file | awk '{a=$1||$3;b=$2||$4;printf "%d%d(binary)=%d(decimal)\n",a,b,a*2+b}'

you should quota the second parameter of mv,you see,if you have a file named "name with blanks",the shell will expand the blanks within variables without double quotas or single quotas or backslash....

-eq and others like that are used to compare two numeric variables,if you wanna compare two strings,use "=" and "!="

you can extract the filename by command---basename

try this AWK file,you can use it by:
awk -f awkfile inputfile

{
2 for(i=1;i<=4;i++)a[$i]++
3 if(a[$1]+a[$2]+a[$3]+a[$4] > 4)
4 printf "%s <",$0;
5 for(i=1;i<=4;i++){
...

Thanks to all,my initialization is uncompleted.Now it's ok by added :

sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;

ps aux | sort -k1 - | awk '{print $1}' | uniq -c
is this OK?

Thanks for your post,it's clear now.And i realized that i misunderstand the remove_copy_if,this algorithm Copies the values of the elements in the range [first,last) to the range positions beginning...

the simpler way is :

echo "123456" | sed 's/\(.\)/\1 /g'

sh inputfile

#! /bin/bash

declare -i now
declare -i seconds
declare -i delta
declare -i time

touch temp

time=1*24*3600 #one day before
now=`date --date="today" +%s`
while read month...