bash awk 系统调用
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awk system call
提问by rares.urdea
I want to use awk and the system()function to move a couple of directories around.
我想使用 awk 和system()函数来移动几个目录。
I have a file that I want to process with awknames file.cfgwhich is organized in the following way:
我有一个文件，我想使用按以下方式组织的awk名称进行处理file.cfg：
/path1 /path2
/some_path /some_other_path
and so on..
each first path is separated from the second path by a whitespace So here's how I did it:
每条第一条路径都与第二条路径用空格隔开所以这是我的做法：
awk '{system(mv -R " ")}' file.cfg
but it doesn't work and I get
但它不起作用，我明白了
sh: 0/home/my_user/path1: No such file or directory
But file.cfglooks like this:
但file.cfg看起来像这样：
/home/my_user/path1 /home/my_user/path2
and there is no 0 before /home. So what am I missing here?
并且之前没有 0 /home。那么我在这里错过了什么？
回答by Joni
You have to quote the command you give to system:
你必须引用你给的命令system：
awk '{system("mv -R " " " )}' file.cfg
Currently mv -Ris interpreted as the value of variable mv minus the value of R, which is 0since neither is defined.
当前mv -R被解释为变量 mv 的值减去 R 的值，0因为两者都没有定义。
回答by sidoh
Why not just use xargs?
为什么不直接使用 xargs？
cat file.cfg | xargs -n 2 mv
This will pass tokens (separated by whitespace) from your file into mv in groups of two.
这会将标记（由空格分隔）从您的文件中以两个为一组传递到 mv 中。
