KB To MB using bash

问题:

I use a command to get the size of a remote folder, after it's run it returns

120928312 http://blah.com

The number is size in bytes. What I'd like to do is have it output in MB, and the http part removed. I'm guessing greping to a file but not sure how to go about it.

回答1:

You can do it with shell builtins

some_command |while read KB dummy;do echo $((KB/1024))Mb;done

Here is a more useful version:

#!/bin/sh
human_print(){
while read B dummy; do
  [ $B -lt 1024 ] && echo ${B} bytes && break
  KB=$(((B+512)/1024))
  [ $KB -lt 1024 ] && echo ${KB} kilobytes && break
  MB=$(((KB+512)/1024))
  [ $MB -lt 1024 ] && echo ${MB} megabytes && break
  GB=$(((MB+512)/1024))
  [ $GB -lt 1024 ] && echo ${GB} gigabytes && break
  echo $(((GB+512)/1024)) terabytes
done
}

echo 120928312 http://blah.com | human_print

回答2:

Try doing this using bash builtins (display an integer like the KB version)

var="120928312 http://blah.com"
echo "$(( ${var%% *} / 1024)) MB"

回答3:

how about this line:

kent$  echo "120928312 http://blah.com"|awk '{$1/=1024;printf "%.2fMB\n",$1}'
118094.05MB

回答4:

function bytes_for_humans {
    local -i bytes=$1;
    if [[ $bytes -lt 1024 ]]; then
        echo "${bytes}B"
    elif [[ $bytes -lt 1048576 ]]; then
        echo "$(( (bytes + 1023)/1024 ))KiB"
    else
        echo "$(( (bytes + 1048575)/1048576 ))MiB"
    fi
}

$ bytes_for_humans 1
1 Bytes
$ bytes_for_humans 1024
1KiB
$ bytes_for_humans 16777216
16MiB

回答5:

Try using awk

awk '{MB=$1/1024; print $MB}'

$1 - value of the first column, size (KB) in this case