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PART II
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$ ls doc1 doc2 document docs mydoc monday tuesday $ ls doc* doc1 doc2 document docs $ ls *day monday tuesday $ ls m*d* monday $
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Filenames often include an extension specified with a period and followed by a string denoting the file type, such as c for C files, cpp for C++ files, or even jpg for JPEG image files The extension has no special status and is only part of the characters making up the filename Using the asterisk makes it easy to select files with a given extension In the next example, the asterisk is used to list only those files with a c extension The asterisk placed before the c constitutes the argument for ls
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$ ls *c calcc mainc
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You can use * with the rm command to erase several files at once The asterisk first selects a list of files with a given extension or beginning or ending with a given set of characters and then it presents this list of files to the rm command to be erased In the next example, the rm command erases all files beginning with the pattern doc :
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$ rm doc*
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TIP Use the * file expansion character carefully and sparingly with the rm command The
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combination can be dangerous A misplaced * in an rm command without the -i option could easily erase all the files in your current directory The -i option will first prompt the user to confirm whether the file should be deleted
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The question mark ( ) matches only a single character in filenames Suppose you want to match the files doc1 and docA, but not the file document Whereas the asterisk will match filenames of any length, the question mark limits the match to just one extra character
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Part II:
The Linux Shell and File Structure
The next example matches files that begin with the word doc followed by a single differing letter:
$ ls doc1 docA document $ ls doc doc1 docA
Matching a Range of Characters
Whereas the * and file expansion characters specify incomplete portions of a filename, the brackets ([]) enable you to specify a set of valid characters to search for Any character placed within the brackets will be matched in the filename Suppose you want to list files beginning with doc , but only ending in 1 or A You are not interested in filenames ending in 2 or B, or any other character Here is how it s done:
$ ls doc1 doc2 doc3 docA docB docD document $ ls doc[1A] doc1 docA
You can also specify a set of characters as a range, rather than listing them one by one A dash placed between the upper and lower bounds of a set of characters selects all characters within that range The range is usually determined by the character set in use In an ASCII character set, the range a-g will select all lowercase alphabetic characters from a through g In the next example, files beginning with the pattern doc and ending in characters 1 through 3 are selected Then, those ending in characters B through E are matched
$ ls doc1 $ ls docB doc[1-3] doc2 doc3 doc[B-E] docD
You can combine the brackets with other file expansion characters to form flexible matching operators Suppose you want to list only filenames ending in either a c or o extension, but no other extension You can use a combination of the asterisk and brackets: * [co] The asterisk matches all filenames, and the brackets match only filenames with extension c or o
$ ls *[co] mainc maino calcc
Matching Shell Symbols
At times, a file expansion character is actually part of a filename In these cases, you need to quote the character by preceding it with a backslash to reference the file In the next example, the user needs to reference a file that ends with the character, answers The is, however, a file expansion character and would match any filename beginning with answers that has one or more characters In this case, the user quotes the with a preceding backslash to reference the filename
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