如何遍历Bash脚本中的位置参数? [英] How to iterate over positional parameters in a Bash script?

问题描述

我要去哪里错了?

我有一些文件，如下所示:

I have some files as follows:

filename_tau.txt
filename_xhpl.txt
fiename_fft.txt
filename_PMB_MPI.txt
filename_mpi_tile_io.txt

我将tau，xhpl，fft，mpi_tile_io和PMB_MPI作为位置参数传递给脚本，如下所示:

I pass tau, xhpl, fft, mpi_tile_io and PMB_MPI as positional parameters to script as follows:

./script.sh tau xhpl mpi_tile_io fft PMB_MPI

我希望grep在循环内搜索，首先搜索tau，xhpl等.

I want grep to search inside a loop, first searching tau, xhpl and so on..

point=$1     #initially points to first parameter
i="0"
while [$i -le 4]
do
  grep "$str" ${filename}${point}.txt
  i=$[$i+1]
  point=$i     #increment count to point to next positional parameter
done

推荐答案

像这样设置您的for循环.使用这种语法，循环遍历位置参数，依次将每个参数分配给点".

Set up your for loop like this. With this syntax, the loop iterates over the positional parameters, assigning each one to 'point' in turn.

for point; do
  grep "$str" ${filename}${point}.txt 
done

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