取消格式化磁盘大小字符串

Question

有没有办法通过一个Bash命令将1K等字符串转换为1000，1M到1000000等？我想避免成为一百万和三十一个人为此创建一个＆gt; 10行或＆gt; 100个字符的单行黑客。类似于iso2int 5MB。

修改：units -t '5MB' 'bytes有效，但该工具不可用。有没有简单的方法来转换 5M或5MB并且类似于字节？

max的解决方案很优雅，但在我的情况下最短的等价物至少是sed -e 's/b//i;s/k/*1000/i;s/m/*1000000/i;s/g/*1000000000/i;s/t/*1000000000000/i' | bc。

Answer 1

这样的东西？

$ echo "1K + 10M" | sed -e "s/K/*1024/g;s/M/*1024*1024/" | bc
10486784

编辑：

sed -e 's/t/kg/i;s/g/km/i;s/m/kk/i;s/k/*1000/ig;s/b//i' | bc

Answer 2

修改

我的原始答案只是 愚蠢 。这是一个基于max taldykin's sed/bc excellent answer的纯Bash解决方案。

s=21TB;(( $BASH_VERSINFO >= 4 ))&&s=${s^^};s=${s/B};s=${s/E/KP};s=${s/P/KT}; s=${s/T/KG};s=${s/G/KM};s=${s/M/KK};s=${s//K/*1024};printf "%'u\n" $((s))

这比我原来的单行程更长，因为它包含不区分大小写的事实，而后者没有（尽管它可以和功能一样）。当调整为等效功能时，字符数只是max的两倍。

<强>原始

这是一个纯粹的Bash解决方案：

作为一项功能（见下面的单行代码）：

#!/bin/bash
# written by Dennis Williamson 2010-12-09
# for https://stackoverflow.com/questions/4399475/unformat-disk-size-strings
expandsi () {
    # set k to 1000 if that's your preference, p is a pattern to match unit chars
    local k=1024 p='E|P|T|G|M|K| '   # exa, peta, tera, giga, mega, kilo, bytes
    local b=$1 c e s=${p//|}         # s is the list of units
    (( $BASH_VERSINFO >= 4 )) && b=${b^^}  # toupper for case insensitivity
    b=${b%B*}                        # strip any trailing B from the input
    c=${b: -1}                       # get the unit character
    c=${c/%!($p)/ }                  # add a space if there's no unit char
    b=${b%@($p)*}                    # remove the unit character
    e=${s#*${c:0:1}}                 # index into the list of units
    # do the math, remove the single quote to omit the thousands separator
    printf "%'u\n" $((b * k**${#e}))
}

测试功能：

testvals='1 22 333 4444 '
testvals+='4B 44B 1000B '
testvals+='1M 1MB 987MB '
testvals+='1K 23KB 1KB 100K '
testvals+='10G 10GB 3333G '
testvals+='3T 12PB '
# exabytes is pushing it for Bash's int capacity
# on my system, printf "%'u\n" -1 gives 18,446,744,073,709,551,615
testvals+='15EB '

for i in $testvals
do
    expandsi $i
done

结果：

1
22
333
4,444
4
44
1,000
1,048,576
1,048,576
1,034,944,512
1,024
23,552
1,024
102,400
10,737,418,240
10,737,418,240
3,578,781,499,392
3,298,534,883,328
13,510,798,882,111,488
17,293,822,569,102,704,640

正如所承诺的那样，最终，单行版本：

$ b=200GB k=1024 p='E|P|T|G|M|K| ';s=${p//|} b=${b%B*};c=${b: -1};c=${c/%!($p)/ };b=${b%@($p)*};e=${s#*${c:0:1}};printf "%'u\n" $((b * k**${#e}))
214,748,364,800