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Diffstat (limited to '')
| -rw-r--r-- | man7/glob.7 | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/man7/glob.7 b/man7/glob.7 index 466701c..0130c80 100644 --- a/man7/glob.7 +++ b/man7/glob.7 @@ -4,7 +4,7 @@ .\" .\" 2003-08-24 fix for / by John Kristoff + joey .\" -.TH glob 7 2023-03-08 "Linux man-pages 6.05.01" +.TH glob 7 2023-10-31 "Linux man-pages 6.7" .SH NAME glob \- globbing pathnames .SH DESCRIPTION @@ -12,11 +12,11 @@ Long ago, in UNIX\ V6, there was a program .I /etc/glob that would expand wildcard patterns. Soon afterward this became a shell built-in. -.PP +.P These days there is also a library routine .BR glob (3) that will perform this function for a user program. -.PP +.P The rules are as follows (POSIX.2, 3.13). .SS Wildcard matching A string is a wildcard pattern if it contains one of the @@ -25,14 +25,14 @@ Globbing is the operation that expands a wildcard pattern into the list of pathnames matching the pattern. Matching is defined by: -.PP +.P A \[aq]?\[aq] (not between brackets) matches any single character. -.PP +.P A \[aq]*\[aq] (not between brackets) matches any string, including the empty string. -.PP +.P .B "Character classes" -.PP +.P An expression "\fI[...]\fP" where the first character after the leading \[aq][\[aq] is not an \[aq]!\[aq] matches a single character, namely any of the characters enclosed by the brackets. @@ -41,9 +41,9 @@ therefore \[aq]]\[aq] can be allowed between the brackets, provided that it is the first character. (Thus, "\fI[][!]\fP" matches the three characters \[aq][\[aq], \[aq]]\[aq], and \[aq]!\[aq].) -.PP +.P .B Ranges -.PP +.P There is one special convention: two characters separated by \[aq]\-\[aq] denote a range. (Thus, @@ -55,15 +55,15 @@ by making it the first or last character between the brackets. and "\fI[\-\-0]\fP" matches the three characters \[aq]\-\[aq], \[aq].\[aq], and \[aq]0\[aq], since \[aq]/\[aq] cannot be matched.) -.PP +.P .B Complementation -.PP +.P An expression "\fI[!...]\fP" matches a single character, namely any character that is not matched by the expression obtained by removing the first \[aq]!\[aq] from it. (Thus, "\fI[!]a\-]\fP" matches any single character except \[aq]]\[aq], \[aq]a\[aq], and \[aq]\-\[aq].) -.PP +.P One can remove the special meaning of \[aq]?\[aq], \[aq]*\[aq], and \[aq][\[aq] by preceding them by a backslash, or, @@ -79,7 +79,7 @@ A \[aq]/\[aq] in a pathname cannot be matched by a \[aq]?\[aq] or \[aq]*\[aq] wildcard, or by a range like "\fI[.\-0]\fP". A range containing an explicit \[aq]/\[aq] character is syntactically incorrect. (POSIX requires that syntactically incorrect patterns are left unchanged.) -.PP +.P If a filename starts with a \[aq].\[aq], this character must be matched explicitly. (Thus, \fIrm\ *\fP will not remove .profile, and \fItar\ c\ *\fP will not @@ -90,11 +90,11 @@ into the list of matching pathnames" was the original UNIX definition. It allowed one to have patterns that expand into an empty list, as in -.PP +.P .nf xv \-wait 0 *.gif *.jpg .fi -.PP +.P where perhaps no *.gif files are present (and this is not an error). However, POSIX requires that a wildcard pattern is left @@ -103,31 +103,31 @@ matching pathnames is empty. With .I bash one can force the classical behavior using this command: -.PP +.P .in +4n .EX shopt \-s nullglob .EE .in .\" In Bash v1, by setting allow_null_glob_expansion=true -.PP +.P (Similar problems occur elsewhere. For example, where old scripts have -.PP +.P .in +4n .EX rm \`find . \-name "*\[ti]"\` .EE .in -.PP +.P new scripts require -.PP +.P .in +4n .EX rm \-f nosuchfile \`find . \-name "*\[ti]"\` .EE .in -.PP +.P to avoid error messages from .I rm called with an empty argument list.) @@ -139,7 +139,7 @@ First of all, they match filenames, rather than text, and secondly, the conventions are not the same: for example, in a regular expression \[aq]*\[aq] means zero or more copies of the preceding thing. -.PP +.P Now that regular expressions have bracket expressions where the negation is indicated by a \[aq]\[ha]\[aq], POSIX has declared the effect of a wildcard pattern "\fI[\[ha]...]\fP" to be undefined. @@ -161,21 +161,21 @@ expression: namely (i) the negation, (ii) explicit single characters, and (iii) ranges. POSIX specifies ranges in an internationally more useful way and adds three more types: -.PP +.P (iii) Ranges X\-Y comprise all characters that fall between X and Y (inclusive) in the current collating sequence as defined by the .B LC_COLLATE category in the current locale. -.PP +.P (iv) Named character classes, like -.PP +.P .nf [:alnum:] [:alpha:] [:blank:] [:cntrl:] [:digit:] [:graph:] [:lower:] [:print:] [:punct:] [:space:] [:upper:] [:xdigit:] .fi -.PP +.P so that one can say "\fI[[:lower:]]\fP" instead of "\fI[a\-z]\fP", and have things work in Denmark, too, where there are three letters past \[aq]z\[aq] in the alphabet. @@ -183,13 +183,13 @@ These character classes are defined by the .B LC_CTYPE category in the current locale. -.PP +.P (v) Collating symbols, like "\fI[.ch.]\fP" or "\fI[.a-acute.]\fP", where the string between "\fI[.\fP" and "\fI.]\fP" is a collating element defined for the current locale. Note that this may be a multicharacter element. -.PP +.P (vi) Equivalence class expressions, like "\fI[=a=]\fP", where the string between "\fI[=\fP" and "\fI=]\fP" is any collating element from its equivalence class, as defined for the |