Info Catalog bash: Word Splitting bash: Shell Expansions bash: Quote Removal

bash: Filename Expansion

 
 3.5.8 Filename Expansion
 ------------------------
 

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· Pattern Matching    How the shell matches patterns.
 
 After word splitting, unless the '-f' option has been set (The Set
 Builtin), Bash scans each word for the characters '*', '?', and '['.
 If one of these characters appears, then the word is regarded as a
 PATTERN, and replaced with an alphabetically sorted list of filenames
 matching the pattern (Pattern Matching).  If no matching
 filenames are found, and the shell option 'nullglob' is disabled, the
 word is left unchanged.  If the 'nullglob' option is set, and no matches
 are found, the word is removed.  If the 'failglob' shell option is set,
 and no matches are found, an error message is printed and the command is
 not executed.  If the shell option 'nocaseglob' is enabled, the match is
 performed without regard to the case of alphabetic characters.
 
    When a pattern is used for filename expansion, the character '.' at
 the start of a filename or immediately following a slash must be matched
 explicitly, unless the shell option 'dotglob' is set.  When matching a
 filename, the slash character must always be matched explicitly.  In
 other cases, the '.' character is not treated specially.
 
    See the description of 'shopt' in The Shopt Builtin, for a
 description of the 'nocaseglob', 'nullglob', 'failglob', and 'dotglob'
 options.
 
    The 'GLOBIGNORE' shell variable may be used to restrict the set of
 filenames matching a pattern.  If 'GLOBIGNORE' is set, each matching
 filename that also matches one of the patterns in 'GLOBIGNORE' is
 removed from the list of matches.  If the 'nocaseglob' option is set,
 the matching against the patterns in 'GLOBIGNORE' is performed without
 regard to case.  The filenames '.' and '..' are always ignored when
 'GLOBIGNORE' is set and not null.  However, setting 'GLOBIGNORE' to a
 non-null value has the effect of enabling the 'dotglob' shell option, so
 all other filenames beginning with a '.' will match.  To get the old
 behavior of ignoring filenames beginning with a '.', make '.*' one of
 the patterns in 'GLOBIGNORE'.  The 'dotglob' option is disabled when
 'GLOBIGNORE' is unset.
 

Info Catalog bash: Word Splitting bash: Shell Expansions bash: Quote Removal