bash 用于 awk 打印除以 1024 的值的 shell 脚本
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shell script for awk print divide value with 1024
提问by naveen_sfx
I am trying to do some arthimatic operations on awk output process. my sample file contains string and it's count. Now i am trying to make the count values to be in format of MB (defualt count will come in bytes.)
我正在尝试对 awk 输出过程进行一些arthimatic 操作。我的示例文件包含字符串和计数。现在我试图使计数值采用 MB 格式（默认计数将以字节为单位。）
Example : myfile.txt
示例：myfile.txt
a 123455
b 34455566
c 10394934839
d 102445555
my script :
我的脚本：
cat myfile.txt | while read line; do name=$line ; name=`echo $fname|awk '{print }'` ; cnt=`echo $fname|awk '{print }'`; if [$cnt -gt 1024] ; then echo "$name value in critical $cnt";fi done
Problem: I want the cnt value should be convert into MB ( cnt/1024/1024) .
问题：我希望 cnt 值应转换为 MB ( cnt/1024/1024) 。
no clue how to achieve this.
不知道如何实现这一目标。
采纳答案by damienfrancois
You can do it like this (pure Bash):
你可以这样做（纯 Bash）：
$ cat myfile.txt | while read l f ; do echo $l $((f/1024/1024)) ;if [ $((f/1024/1024)) -gt
1024 ] ; then echo "$l value in critical ";fi done
a 0
b 32
c 9913
c value in critical
d 97
回答by anubhava
You can do it directly in awkwithout looping in BASH:
您可以直接在awk不循环的情况下进行BASH：
awk '{print , /(1024*1024)}' file
a 0.117736
b 32.8594
c 9913.38
d 97.6997
OR for 2 decimal point output:
或 2 个小数点输出：
awk '{printf "%s %.2f\n", , /(1024*1024)}' file
a 0.12
b 32.86
c 9913.38
d 97.70
回答by Kent
kent$ awk '{printf "%s %.2f\n",,/1024/1024}' file
a 0.12
b 32.86
c 9913.38
d 97.70
change the %.2fto gain different precision.
改变%.2f以获得不同的精度。
if you want to add the critical check:
如果要添加关键检查：
awk '{v=/1024/1024;printf "%s %.2f%s\n",,v,(v>1024?" <=critical":"")}' file
a 0.12
b 32.86
c 9913.38 <=critical
d 97.70
回答by Kent
Another awk way
另一种 awk 方式
awk '{/=2^20}1' file
Formatted
格式化
awk '=sprintf("%.2f",/2^20)' file
With crit
带暴击
awk '=sprintf("%.2f%s",x=(/2^20),x>1024?" [critical]":"")' test
回答by Pithikos
When you have structured data and you want to loop per line, just use awk. Besides the saving of CPU cycles (which is negligible in most cases) the biggest benefit is that you avoid the weird quote and space moaning of Bash.
当您有结构化数据并且想要每行循环时，只需使用awk. 除了节省 CPU 周期（在大多数情况下可以忽略不计）之外，最大的好处是您可以避免 Bash 的奇怪引用和空间呻吟。
awk '{ MB = int(/1024/1024); print " " MB; if (MB > 1024) print " value in critical"}' myfile.txt
Output:
输出：
a 0
b 32
c 9913
c value in critical
d 97
Breaking it down:
分解它：
MB = int(/1024/1024) -> Take the value in the second field ().
Make it into an integer (to round the number)
and store it in the variable MB.
print " " MB -> Print the first field (), followed by
a space, and finally the value in MB.
if (MB > 1024)
print " val.." -> If MB < 1024, print first field followed by msg.
