问题描述
有时候我会重复执行一次特定任务,但是可能永远不会以完全相同的形式重复使用.它包含我要从目录列表中粘贴的文件名.在这之间的某个地方并创建一个bash脚本,我想也许我可以在命令行上创建一个单行函数,例如:
Sometimes I have a one-liner that I am repeating many times for a particular task, but will likely never use again in the exact same form. It includes a file name that I am pasting in from a directory listing. Somewhere in between and creating a bash script I thought maybe I could just create a one-liner function at the command line like:
numresults(){ ls "$1"/RealignerTargetCreator | wc -l }
我已经尝试了一些方法,例如使用eval,使用numresults=function...
,但是并没有迷失在正确的语法上,并且到目前为止还没有在网上找到任何东西. (即将出现的所有内容只是有关bash函数的教程.)
I've tried a few things like using eval, using numresults=function...
, but haven't stumbled on the right syntax, and haven't found anything on the web so far. (Everything coming up is just tutorials on bash functions).
推荐答案
引用我的答案,以询问关于Ask的类似问题Ubuntu:
Quoting my answer for a similar question on Ask Ubuntu:
Compound Commands
A compound command is one of the following:
...
{ list; }
list is simply executed in the current shell environment. list
must be terminated with a newline or semicolon. This is known
as a group command.
...
Shell Function Definitions
A shell function is an object that is called like a simple command and
executes a compound command with a new set of positional parameters.
... [C]ommand is usually a list of commands between { and }, but
may be any command listed under Compound Commands above.
没有给出原因,只是语法.
There's no reason given, it's just the syntax.
在wc -l
之后尝试使用分号:
numresults(){ ls "$1"/RealignerTargetCreator | wc -l; }
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