awk中的多重算术运算
[英]Multiple arithmetic operation in awk
问题描述
我有这个 awk 函数来进行速度转换。
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，为此我需要先将数字/输入乘以 8。我尝试稍微修改一下函数。
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 %s\n" , res , v[s] )
}
hum($1)
但是当我尝试执行它时它挂起，我不得不按Ctrl-C取消操作。 知道有什么问题吗？
4 个解决方案
解决方案1
2 2022-05-18 05:36:49
现在，我想将字节数转换为位，为此我需要先将数字/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 %s\n", x, v[s])
}
hum($1)
解决方案2
1 已采纳 2022-05-18 06:47:24
让我们使用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
}
试一试：
$ for (( i=1 ; i<=10**14 ; i=i*10 )) ; do echo $i ; done | awk -f program.awk
输出：
1 8.00 b/s
10 80.00 b/s
100 800.00 b/s
1000 8.00 kb/s
10000 80.00 kb/s
100000 800.00 kb/s
1000000 8.00 Mb/s
10000000 80.00 Mb/s
100000000 800.00 Mb/s
1000000000 8.00 Gb/s
10000000000 80.00 Gb/s
100000000000 800.00 Gb/s
1000000000000 8.00 Tb/s
10000000000000 80.00 Tb/s
100000000000000 800.00 Tb/s
解决方案3
1 2022-05-18 08:03:56
我不久前写了这个，它可能不完全是你需要的，但应该很容易适应 -
一个将
# of bytes数作为强制性第一个参数的function，带有可选的第二个参数，用于计算
1000而不是1024的幂- 输入
Mm或10for 1000， - 其他任何内容，包括空白，
defaults to 1024
- 输入
并自动将其格式化为最合乎逻辑的范围以供人类阅读，
从一
kilo(kibi)-bit/s开始，到
YOTTA(yobi)-bit/s
***任何能够找出我下面示例中的数字列表中常见内容的人的额外功劳。
———————————————————————————————————————————————————
mawk/gawk '
function bytesformat(_, _______, __, ___, ____, _____, ______)
{
_____=__=(____^=___*=((____=___+=___^="")/___)+___+___)
___/=___
sub("^0+","",_)
____=_____-=substr(_____,index(_____,index(_____,!__)))*\
(_______ ~ "^(10|[Mm])$")
_______=length((____)____)
if ((____*__)<(_______*_)) {
do {
____ *= _____
++___
} while ((____*__)<(_______*_))
}
__=_
sub("(...)+$", ",&", __)
gsub("[^#-.][^#-.][^#-.]", "&,", __)
gsub("[,]*$|^[,]+", "", __)
sub("^[.]", "0&", __)
return \
sprintf(" %10.4f %sb/s (%42s byte%s) ",
_==""?+_:_/(_____^___)*_______,
substr("KMGTPEZY",___,___~___),
__==""?+__:__, (_~_)<_?"s":" ")
} { printf("%35s bytes ::: %s\n",
$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)
解决方案4
1 2022-05-18 08:58:22
知道有什么问题吗？
您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++ }
这里每转减少x 1000 次，所以它最终将等于或低于 1000。第二个代码有
while( x>1000 ){ res = x * 8 / 1000; s++ }
这里每个回合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 body 的 0 次执行或while body 的 +infinity 执行。
请注意，但是当我尝试执行它时它挂起，也可能在 GNU AWK以外的语言中观察到，当您不更改条件的真实性所依赖的变量值时，这些语言确实支持while构造。
在进行算术运算时使用 awk 打印 0
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