Regular Expression usage with ls

Question

I am trying to use ER  Extended Regular Expressions  with ls like ls          I am trying to print all files which contains an extension   I know I could have used ls      but I wanted to try using ER    When I run that code I get this error  ls         No such file or directory

User · Accepted Answer

You are confusing regular expression with shell globbing  If you want to use regular expression to match file names you could do     ls   egrep

User · Answer

You don t say what shell you are using  but they generally don t support regular expressions that way  although there are common  nix CLI tools  grep  sed  etc  that do   What shells like bash do support is globbing  which uses some similiar characters  eg     but is not the same thing   Newer versions of bash do have a regular expression operator       for x in  ls   do      if     x               then          echo  x       fi   done

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