Shell globs: Difference between revisions
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{{#addbodyclass:tag_tech}} | |||
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Globs, is associated with certain kinds of 'match this pattern'. | |||
: also called ''shell globs'', because they are mainly seen in command lines | |||
( | Compare with [[regular expressions]], which are more powerful (but still single-string) ways of expressing patterns. | ||
Shell globs match fairly simple patterns. you can only use: | |||
: {{inlinecode|?}} meaning ''one'' character of anything, and | |||
: {{inlinecode|*}} meaning ''any'' amount of characters of anything | |||
:: ...anything except the directory separateor, {{inlinecode|/}} {{(or presumably {{inlinecode|\}} if imitated in windows)}} | |||
: {{inlinecode|[chars]}} meaning any one of the characters in this set | |||
:: can also be used to match a literal ? or * | |||
: {{inlinecode|[!chars]}} meaning anything other than the characters in this set | |||
:: I've seen [^chars] manage the same, though this isn't ''quite'' standard [https://pubs.opengroup.org/onlinepubs/007904975/utilities/xcu_chap02.html#tag_02_13_01] | |||
If you have both a fnmatch and glob function: | |||
* {{search|C fnmatch|fnmatch()}} is a "matches a single given string with this pattern" | |||
:: (probably nothing related to the filesystem unless you do it yourself) | |||
* {{search|C glob|glob()}} is likely to read directory entries from your filesystem and returns ''all'' matching filenames | |||
:: apparently fnmatch() is ''used'' in the glob() implementation | |||
Latest revision as of 00:32, 21 April 2024
Globs, is associated with certain kinds of 'match this pattern'.
- also called shell globs, because they are mainly seen in command lines
Compare with regular expressions, which are more powerful (but still single-string) ways of expressing patterns.
Shell globs match fairly simple patterns. you can only use:
- ? meaning one character of anything, and
- * meaning any amount of characters of anything
- ...anything except the directory separateor, / {{(or presumably \ if imitated in windows)}}
- [chars] meaning any one of the characters in this set
- can also be used to match a literal ? or *
- [!chars] meaning anything other than the characters in this set
- I've seen [^chars] manage the same, though this isn't quite standard [1]
If you have both a fnmatch and glob function:
- fnmatch() is a "matches a single given string with this pattern"
- (probably nothing related to the filesystem unless you do it yourself)
- glob() is likely to read directory entries from your filesystem and returns all matching filenames
- apparently fnmatch() is used in the glob() implementation