Listing Directories 00‑12 Using Bash extglob Pattern
This article explains how to list directory names ranging from 00 to 12 in a log folder by enabling Bash's extglob option and applying a regular‑expression‑style pattern with the ls command.
A log directory contains subfolders named 00, 01, 02 … 31, and the task is to display only the folders for the first twelve days (00‑12) using a pattern on the file names.
shopt -s extglob
ls -al +(0[0-9]|1[0-3])Explanation
Works in Bash only.
Typical shell globbing uses simple wildcard semantics, not full regular‑expression semantics.
Enabling extglob switches globbing to extended pattern (regex‑like) semantics.
The syntax +(pattern) matches one or more occurrences of the given pattern.
Author: He Weiping, Qunar Travel Division, senior search and database researcher, former Yahoo China search engineer, with extensive experience in search, distributed systems, databases, and cluster design.
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