How to print list filename using ls, but if not found retrun empty string?

Question

I have name file

• hua.txt
• hai.txt

if

print ls *{hua,las}* > taka.txt 

in taka.txt return

ls hua.txt *las*

i want to *las* not there,

i just want in taka.txt

ls hua.txt

and filter *{hua,las}* must there... too

please help

Answer 1

Many shells have different handles when a pathname expansion (glob) fails to match anything.

For example, in bash you have two shell options:

• nullglob:

  If a glob pattern fails to match anything, it is treated literally by default in bash. You can disable this behavior to return an empty string by setting the nullglob option beforehand:

  shopt -s nullglob
  

• failglob:

  This is more explicit, when a glob pattern fails to match anything bash shows a relevant error message:

  shopt -s failglob
  

Given your circumstances, you should go with nullglob if you are using bash, or look out for any similar option if you are using a different shell.