awk中的多重算术运算

Question

我有这个awk函数来做速度转换。

function hum(x) {
split( "B/s KB/s MB/s GB/s TB/s", v); s=1
while( x>1000 ){ x/=1000; s++ }
printf( "%0.2f %s" , x , v[s] )
}
hum($1)

如果单独使用，效果很好。

$ awk -f /tmp/test.awk <<< 1000000
1000.00 KB/s
$ awk -f /tmp/test.awk <<< 100000000
100.00 MB/s

现在，我想将字节数转换为位，要做到这一点，我需要先将数字/输入乘以8。我试着修改一下这个函数。

function hum(x) {
split( "B/s KB/s MB/s GB/s TB/s", v); s=1
while( x>1000 ){ res = x * 8 / 1000; s++ }
printf( "%0.2f %sn" , res , v[s] )
}
hum($1)

但是当我试图执行它时它挂起了，我不得不按Ctrl-C来取消操作。你知道怎么了吗?

Answer 1

现在，我想将字节数转换为位，要做到这一点，我需要先将数字/输入乘以8。

然后将输入值乘以8一次:

function hum(x) {
split("b/s Kb/s Mb/s Gb/s Tb/s", v); s=1
x *= 8
while(x > 1000) {x /= 1000; s++}
printf("%0.2f %sn", x, v[s])
}
hum($1)

Answer 2

我们使用log():

代替循环

$ cat program.awk
function hum2(x,   v,p) {
split( "b/s kb/s Mb/s Gb/s Tb/s", v)             # remember to B -> b
x*=8                                             # to bits conversion
p=int(log(x)/log(1000))                          # figure v slot
return sprintf("%0.2f %s" , x/1000^p , v[p+1] )  # p+1 due to 1 basedness
}
{
print $1,hum2($1)                              # input bytes, output bits
}

兜风:

$ for (( i=1 ; i<=10**14 ; i=i*10 )) ; do echo $i ; done | awk -f program.awk 

输出:

1 8.00 b/s
10 80.00 b/s
100 800.00 b/s
1000 8.00 kb/s
10000 80.00 kb/s
100000 800.00 kb/s
1000000 8.00 Mb/s
10000000 80.00 Mb/s
100000000 800.00 Mb/s
1000000000 8.00 Gb/s
10000000000 80.00 Gb/s
100000000000 800.00 Gb/s
1000000000000 8.00 Tb/s
10000000000000 80.00 Tb/s
100000000000000 800.00 Tb/s

Answer 3

我之前写的这个可能不完全是你需要的，但应该很容易适应-

• 以# of bytes为第一参数的function，

• 带有可选的第二个参数，用于计算1000而不是1024的功率

  • 输入Mm或10for 1000，
  • 其他内容，包括空白，defaults to 1024

• 并自动将其格式化为最符合人类可读性的逻辑范围，

  • 从kilo(kibi)-bit/s，

  • toYOTTA(yobi)-bit/s

***对于能够找出下面示例中数字列表中的共同点的人来说，这是额外的学分。

——————————————————————— ———————————————————————

mawk/gawk '
function bytesformat(_, _______, __, ___, ____, _____, ______)
{
_____=__=(____^=___*=((____=___+=___^="")/___)+___+___)
___/=___

sub("^0+","",_)
____=_____-=substr(_____,index(_____,index(_____,!__)))*
(_______ ~ "^(10|[Mm])$")
_______=length((____)____)
if ((____*__)<(_______*_)) {
do {
____ *= _____
++___
} while ((____*__)<(_______*_))
}
__=_
sub("(...)+$",             ",&", __)
gsub("[^#-.][^#-.][^#-.]", "&,", __)
gsub("[,]*$|^[,]+",          "", __)
sub("^[.]", "0&", __)
return 
sprintf(" %10.4f %sb/s (%42s byte%s) ",
_==""?+_:_/(_____^___)*_______,
substr("KMGTPEZY",___,___~___),
__==""?+__:__, (_~_)<_?"s":" ")
} { printf("%35s bytes ::: %sn",
$1, 
bytesformat($1, 10)) }'

6841 bytes :::     54.7280 Kb/s (                                     6,841 bytes) 
15053 bytes :::    120.4240 Kb/s (                                    15,053 bytes) 
23677 bytes :::    189.4160 Kb/s (                                    23,677 bytes) 
32839 bytes :::    262.7120 Kb/s (                                    32,839 bytes) 
42293 bytes :::    338.3440 Kb/s (                                    42,293 bytes) 
52183 bytes :::    417.4640 Kb/s (                                    52,183 bytes) 
62233 bytes :::    497.8640 Kb/s (                                    62,233 bytes) 
72733 bytes :::    581.8640 Kb/s (                                    72,733 bytes) 
83269 bytes :::    666.1520 Kb/s (                                    83,269 bytes) 
138641 bytes :::      1.1091 Mb/s (                                   138,641 bytes) 
149767 bytes :::      1.1981 Mb/s (                                   149,767 bytes) 
162011 bytes :::      1.2961 Mb/s (                                   162,011 bytes) 
174221 bytes :::      1.3938 Mb/s (                                   174,221 bytes) 
186343 bytes :::      1.4907 Mb/s (                                   186,343 bytes) 
199181 bytes :::      1.5934 Mb/s (                                   199,181 bytes) 
211559 bytes :::      1.6925 Mb/s (                                   211,559 bytes) 
224449 bytes :::      1.7956 Mb/s (                                   224,449 bytes) 
237733 bytes :::      1.9019 Mb/s (                                   237,733 bytes) 
128260807 bytes :::      1.0261 Gb/s (                               128,260,807 bytes) 
128565049 bytes :::      1.0285 Gb/s (                               128,565,049 bytes) 
128932561 bytes :::      1.0315 Gb/s (                               128,932,561 bytes) 
129304523 bytes :::      1.0344 Gb/s (                               129,304,523 bytes) 
129765859 bytes :::      1.0381 Gb/s (                               129,765,859 bytes) 
130111459 bytes :::      1.0409 Gb/s (                               130,111,459 bytes) 
130533133 bytes :::      1.0443 Gb/s (                               130,533,133 bytes) 
131012801 bytes :::      1.0481 Gb/s (                               131,012,801 bytes) 
131305043 bytes :::      1.0504 Gb/s (                               131,305,043 bytes) 
128004093619 bytes :::      1.0240 Tb/s (                           128,004,093,619 bytes) 
128026268633 bytes :::      1.0242 Tb/s (                           128,026,268,633 bytes) 
128056111093 bytes :::      1.0244 Tb/s (                           128,056,111,093 bytes) 
128071706179 bytes :::      1.0246 Tb/s (                           128,071,706,179 bytes) 
128082430067 bytes :::      1.0247 Tb/s (                           128,082,430,067 bytes) 
128102475287 bytes :::      1.0248 Tb/s (                           128,102,475,287 bytes) 
128115312811 bytes :::      1.0249 Tb/s (                           128,115,312,811 bytes) 
128157555781 bytes :::      1.0253 Tb/s (                           128,157,555,781 bytes) 
128175556181 bytes :::      1.0254 Tb/s (                           128,175,556,181 bytes) 
128004004377827 bytes :::      1.0240 Pb/s (                       128,004,004,377,827 bytes) 
128040044659991 bytes :::      1.0243 Pb/s (                       128,040,044,659,991 bytes) 
128074066014953 bytes :::      1.0246 Pb/s (                       128,074,066,014,953 bytes) 
128127783733093 bytes :::      1.0250 Pb/s (                       128,127,783,733,093 bytes) 
128177777757611 bytes :::      1.0254 Pb/s (                       128,177,777,757,611 bytes) 
128200131001829 bytes :::      1.0256 Pb/s (                       128,200,131,001,829 bytes) 
128221782218423 bytes :::      1.0258 Pb/s (                       128,221,782,218,423 bytes) 
128237784424429 bytes :::      1.0259 Pb/s (                       128,237,784,424,429 bytes) 
128262808216561 bytes :::      1.0261 Pb/s (                       128,262,808,216,561 bytes) 
128055360778053559 bytes :::      1.0244 Eb/s (                   128,055,360,778,053,559 bytes) 
128082834342828077 bytes :::      1.0247 Eb/s (                   128,082,834,342,828,077 bytes) 
128112814740831073 bytes :::      1.0249 Eb/s (                   128,112,814,740,831,073 bytes) 
128172605482718161 bytes :::      1.0254 Eb/s (                   128,172,605,482,718,161 bytes) 
128203333333333399 bytes :::      1.0256 Eb/s (                   128,203,333,333,333,399 bytes) 
128240343634404269 bytes :::      1.0259 Eb/s (                   128,240,343,634,404,269 bytes) 
128272818280928081 bytes :::      1.0262 Eb/s (                   128,272,818,280,928,081 bytes) 
128282816070718271 bytes :::      1.0263 Eb/s (                   128,282,816,070,718,271 bytes) 
128289494449498271 bytes :::      1.0263 Eb/s (                   128,289,494,449,498,271 bytes) 
128030578058078030329 bytes :::      1.0242 Zb/s (               128,030,578,058,078,030,329 bytes) 
128172161171772727271 bytes :::      1.0254 Zb/s (               128,172,161,171,772,727,271 bytes) 
128234814212823481421 bytes :::      1.0259 Zb/s (               128,234,814,212,823,481,421 bytes) 
128282727262616060507 bytes :::      1.0263 Zb/s (               128,282,727,262,616,060,507 bytes) 
128286164949865319531 bytes :::      1.0263 Zb/s (               128,286,164,949,865,319,531 bytes) 
128372737272827373721 bytes :::      1.0270 Zb/s (               128,372,737,272,827,373,721 bytes) 
128393838393839382839 bytes :::      1.0272 Zb/s (               128,393,838,393,839,382,839 bytes) 
128505500051850550037 bytes :::      1.0280 Zb/s (               128,505,500,051,850,550,037 bytes) 
128669659758768758857 bytes :::      1.0294 Zb/s (               128,669,659,758,768,758,857 bytes) 
130000000000093999992023 bytes :::      1.0400 Yb/s (           130,000,000,000,093,999,992,023 bytes) 
131111111311113111311131 bytes :::      1.0489 Yb/s (           131,111,111,311,113,111,311,131 bytes) 
131111153353153531553111 bytes :::      1.0489 Yb/s (           131,111,153,353,153,531,553,111 bytes) 
131111531315333335313531 bytes :::      1.0489 Yb/s (           131,111,531,315,333,335,313,531 bytes) 
131113133333311333331111 bytes :::      1.0489 Yb/s (           131,113,133,333,311,333,331,111 bytes) 
131113551355135511111111 bytes :::      1.0489 Yb/s (           131,113,551,355,135,511,111,111 bytes) 
131131113131113131131111 bytes :::      1.0490 Yb/s (           131,131,113,131,113,131,131,111 bytes) 
131131331133111331313111 bytes :::      1.0491 Yb/s (           131,131,331,133,111,331,313,111 bytes) 
131133133131333313331311 bytes :::      1.0491 Yb/s (           131,133,133,131,333,313,331,311 bytes) 

Answer 4

知道怎么回事吗?

你已经创建了导致它挂起的无限循环，第一个代码有

while( x>1000 ){ x/=1000; s++ }

这里每回合减少x1000次，所以它最终将等于或低于1000。第二个代码

while( x>1000 ){ res = x * 8 / 1000; s++ }

这里每回合x用于计算res，但x本身的值永远不会改变，因此您将获得while体的0执行或while体的+无限执行。

注意但是当我试图执行它时它挂起可能也在GNUAWK以外的语言中观察到，这些语言支持while结构，当你不改变条件的真实性所依赖的变量的值时。