bash - concatenate a string into a file through a command that is a single valued argument to a script

Question

I need to concatenate a string into a file through a command that is a single valued argument to a script:

defining sample text: TEXT="sample text"

defining characteristic script : transfer.sh $1

desired usage (to be corrected): ./transfer.sh "echo $TEXT >> test.log"

desired output in test.log ... (previous contents) sample text

Answer 1

您可以在文件中使用eval命令：transfer.sh

eval $1

它将test.log在最后一行生成“示例文本”。请注意，您传递给transfer.sh脚本的任何内容都将被执行。因此，如果您的用户通过"rm -r /home/alan/papers"，您papers文件夹中的所有内容都将被删除。