[英]awk or sed to change column value in a file
I have a csv file with data as follows 我有一个csv文件,其数据如下
16:47:07,3,r-4-VM,230000000.,0.466028518635,131072,0,0,0,60,0
16:47:11,3,r-4-VM,250000000.,0.50822578824,131072,0,0,0,0,0
16:47:14,3,r-4-VM,240000000.,0.488406067907,131072,0,0,32768,0,0
16:47:17,3,r-4-VM,230000000.,0.467893525702,131072,0,0,0,0,0
I would like to shorten the value in the 5th column. 我想缩短第5列中的值。
Desired output 所需的输出
16:47:07,3,r-4-VM,230000000.,0.46,131072,0,0,0,60,0
16:47:11,3,r-4-VM,250000000.,0.50,131072,0,0,0,0,0
16:47:14,3,r-4-VM,240000000.,0.48,131072,0,0,32768,0,0
16:47:17,3,r-4-VM,230000000.,0.46,131072,0,0,0,0,0
Your help is highly appreciated 非常感谢您的帮助
awk '{$5=sprintf( "%.2g", $5)} 1' OFS=, FS=, input
这将四舍五入并在第一行打印.47
而不是.46
,但这也许是理想的。
Try with this: 试试这个:
cat filename | sed 's/\(^.*\)\(0\.[0-9][0-9]\)[0-9]*\(,.*\)/\1\2\3/g'
So far, the output is at GNU/Linux standard output, so 到目前为止,输出为GNU / Linux标准输出,因此
cat filename | sed 's/\(^.*\)\(0\.[0-9][0-9]\)[0-9]*\(,.*\)/\1\2\3/g' > out_filename
will send the desired result to out_filename
会将所需结果发送到
out_filename
If rounding is not desired, ie 0.466028518635
needs to be printed as 0.46
, use: 如果不需要舍入,即需要将
0.466028518635
打印为0.46
,请使用:
cat <input> | awk -F, '{$5=sprintf( "%.4s", $5)} 1' OFS=,
(This can another example of Useless use of cat ) (这可能是猫无用的另一个例子)
You want it in perl, This is it: 您要在perl中使用它,就是这样:
perl -F, -lane '$F[4]=~s/^(\d+\...).*/$1/g;print join ",",@F' your_file
tested below: 测试如下:
> cat temp
16:47:07,3,r-4-VM,230000000.,0.466028518635,131072,0,0,0,60,0
16:47:11,3,r-4-VM,250000000.,10.50822578824,131072,0,0,0,0,0
16:47:14,3,r-4-VM,240000000.,0.488406067907,131072,0,0,32768,0,0
16:47:17,3,r-4-VM,230000000.,0.467893525702,131072,0,0,0,0,0
> perl -F, -lane '$F[4]=~s/^(\d+\...).*/$1/g;print join ",",@F' temp
16:47:07,3,r-4-VM,230000000.,0.46,131072,0,0,0,60,0
16:47:11,3,r-4-VM,250000000.,10.50,131072,0,0,0,0,0
16:47:14,3,r-4-VM,240000000.,0.48,131072,0,0,32768,0,0
16:47:17,3,r-4-VM,230000000.,0.46,131072,0,0,0,0,0
sed -r 's/^(([^,]+,){4}[^,]{4})[^,]*/\1/' file.csv
This might work for you (GNU sed): 这可能对您有用(GNU sed):
sed -r 's/([^,]{,4})[^,]*/\1/5' file
This replaces the 5th occurence of non-commas to no more than 4 characters length. 这会将第5次出现的非逗号替换为不超过4个字符的长度。
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