AWK如何处理N多列的列参数？

hosyp

我有个文件有几百列不定，要得到其中指定列，已求出指定列的列数，是一个字符串，如“$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18”，
如何让AWK调用它？
用aa=“$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18”, awk '{print aaa}' aaa=$aa source.txt 只能得到如下结果，而不是我要的值：
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,
$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18,

justlooks

直接awk '{print $1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18}' 不行？

hosyp

事先不知道是哪几个列呀，这是算出来的呀
有一个设置文件存的是所有需要的列，我用shell找出需要列在源文件中的列号，得出这么个字符串，换个源文件列号就变了

wtuter

回复 1# hosyp


    aa=“1,2,9,11,91,4,5,25,99，6,18”, awk '{print $aaa}' aaa=$aa source.txt

beginner-bj

这样的问题，用eval。

hosyp

回复 4# wtuter


    这样不行，只能打出第一列

ywlscpl

a='$1,$2,$9,$11,$91,$4,$5,$25,,$99,$6,$18'
awk "{print $a}" file

hosyp

我试了一下，用如下语句可以：
aa='$1,$2,$9,$11,$91,$4,$5,$25,$99,$6,$18'
echo '{print '$aa'}'>progfile
awk -F, -f progfile source.txt

iori809

恩没错~ 解决思路就是 绝对引用和部分引用的区别