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star-dot-star

The *.* notation used in commands that reference files. The first star means "all files," and the second star means "all extensions." See wild cards.



wild cards

Symbols used to represent any value when selecting specific files. In DOS, Windows and Unix, the asterisk (*) represents any collection of characters, and the question mark (?) represents a single character. In SQL, the percent sign (%) and underscore (_) are used for matching text. Note the following examples:


 DOS and Windows (case insensitive)

 *.gif    .gif or .GIF extension

 a*.gif   beginning with "a" or "A"

 boot.*   all files named "BooT"
           any mix upper/lower case

 *.d*     extensions starting with
           "d" or "D"

 ?abc     1ABC, 2abc, etc.

 ??abc    10ABC, xxabc, etc.


 Windows only (case insensitive)

 *t.jpg   JPEG files ending with "T"


 Unix only (case sensitive)

 *.jpg    .jpg extension

 *.JPG    .JPG extension

 a*.jpg   beginning with "a"

 A*.jpg   beginning with "A"

 boot.*   all files named "boot"

 BOOT.*   all files named "BOOT"

 ?abc     1abc, xabc, etc.

 ??ABC    10ABC, XXABC, etc.


 SQL

 Good%    begining with "Good"

 _bcd     any name followed by "bcd"





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