I have already read some topic but there is no similar to mine.
我已经阅读了一些主题,但与我的相似。
I need to pass to sed command with a $value but its too hard :
我需要使用$ value传递给sed命令,但它太难了:
sed "1,$valued" filename.txt
like
sed "1,4d" filename.txt
How can i do that ?
我怎样才能做到这一点 ?
2 个解决方案
#1
That's trying to use a variable called $valued.
那是试图使用一个名为$ valued的变量。
So you can either:
所以你可以:
1,${value}d.
Or set $valued to 4d.
或者将$ value设置为4d。
#2
Easiest way:
sed "1,$value"d filename.txt
$value is a shell variable (I assume you were already doing that). So you just needed a way to separate the variable name from what comes next (to avoid evaluating $valued). Quote marks do the job just fine since the shell removes them before calling sed.
$ value是一个shell变量(我假设你已经这样做了)。所以你只需要一种方法将变量名与下一个变量名分开(以避免评估$ values)。由于shell在调用sed之前删除它们,因此引用标记可以正常工作。
#1
That's trying to use a variable called $valued.
那是试图使用一个名为$ valued的变量。
So you can either:
所以你可以:
1,${value}d.
Or set $valued to 4d.
或者将$ value设置为4d。
#2
Easiest way:
sed "1,$value"d filename.txt
$value is a shell variable (I assume you were already doing that). So you just needed a way to separate the variable name from what comes next (to avoid evaluating $valued). Quote marks do the job just fine since the shell removes them before calling sed.
$ value是一个shell变量(我假设你已经这样做了)。所以你只需要一种方法将变量名与下一个变量名分开(以避免评估$ values)。由于shell在调用sed之前删除它们,因此引用标记可以正常工作。