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journal:spring2019:bmurphy7:week4

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journal:spring2019:bmurphy7:week4 [2019/02/13 15:32]
bmurphy7
journal:spring2019:bmurphy7:week4 [2019/02/13 16:11] (current)
bmurphy7
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 ====February 13, 2019==== ====February 13, 2019====
 +So in this week of Unix we learned about Wildcards which are “commands” that allow us to simplify our commands, or in the case of //ls// allow us to narrow down what we are searching for. There are four wildcards “? , *, [], [^]” which means match any one character, match 0 or more of any character, match 1 of any of enclosed characters, and do **__NOT__** match one of any enclosed characters, respectfully. The best way to show how it works is with the //ls// command. The ? means that for each ? //ls// will display every file that has that many characters, so //ls ????// will display all files that are 4 characters long. The *  means that everything from here to a new character is fair game, for instance //ls *//  will display all files in the directory for we say show us all files that have 1 or more characters in their name, note that it will use every character. Now if we do //ls c*// we will see every file that starts with c. //ls *c*// will show all files that contain a “c”, since * can also be no characters, and //ls *c*c*// will show all files that contain two or more c’s. The [] means that any characters in it can be used, so //ls [ct]*// will mean show all files that start with a “c” or a “t”. While //ls [c-t]*// will show all files that start with any letter from “c” to “t.” The final wildcard [^] means that whatever is in here is wrong so do not use these, for stance //ls [^ct]// means  show all files that start with any letter that is not a “c” or “t.” ​
  
  
journal/spring2019/bmurphy7/week4.txt · Last modified: 2019/02/13 16:11 by bmurphy7