shell 自动计算 bytes KB MB
自动计算 bytes 为 KB、MB、GB、TB，代码分2种，一种显示整数，一种显示2位小数。
#!/bin/sh
human_bytes(){
while read B dummy; do
[ $B -lt 1024 ] && echo ${B} Bytes && break
KB=$(((B+512)/1024))
[ $KB -lt 1024 ] && echo ${KB} KiB && break
MB=$(((KB+512)/1024))
[ $MB -lt 1024 ] && echo ${MB} MiB && break
GB=$(((MB+512)/1024))
[ $GB -lt 1024 ] && echo ${GB} GiB && break
echo $(((GB+512)/1024)) TiB
done
}
human_bytes_2(){
while read B dummy; do
[ $B -lt 1024 ] && echo ${B} Bytes && break
KB=$(echo "scale = 2; $B/1024" | bc | awk '{printf "%.2f", $0}')
[ $(echo "$KB > 1024" | bc) -eq 0 ] && echo ${KB} KiB && break
MB=$(echo "scale = 2; $KB/1024" | bc | awk '{printf "%.2f", $0}')
[ $(echo "$MB > 1024" | bc) -eq 0 ] && echo ${MB} MiB && break
GB=$(echo "scale = 2; $MB/1024" | bc | awk '{printf "%.2f", $0}')
[ $(echo "$GB > 1024" | bc) -eq 0 ] && echo ${GB} GiB && break
echo $(echo "scale = 2; $GB/1024" | bc | awk '{printf "%.2f", $0}') TiB
done
}