Basic Linux TutorialIntroduction – What is it? Why to learn? Linux installation directory structures Boot process Run levels in Linux Desktop Environments Different shells BASH Internal and External Commands Basic Linux Commands Important files and directories in Linux Environmental and Shell Variables Command history in Linux Character classes in Linux Text editors vim nano Searching files Creating new files Viewing File Contents File commands File permissions and ownership WildCards (Globbing) in files File compression Directory commands xargs command in Linux Comparing files Searching patterns using grep command Translating the characters using tr command Extracting data using cut command Stream editing using sed command Data extraction and reporting using awk command Sorting the file or string input uniq command in Linux Difference between grep, tr, cut, sed and awk commands Hardware commands Hard disk and memory space commands Working with Processes Managing Jobs Working with cron jobs Service command in Linux Network commands Managing Users and Groups Other Popular commands Standard streams and Redirection Pipes Package Managers in Linux
wildcards in linux shellWildcards are used to match multiple files. For example –
- abc* – Here * will match all files that start with abc
- abc[pqr] – here square bracket will match any file that starts with abc and ends with p or q or r
- abc? – here ? will match just single character. It will match all files that start with abc and end with any other character.
Difference between WildCards (Globbing) and Regular expressionsIt is worth noting that even though wildcard characters are same as meta characters in regular expressions, they are completely different. For example – abc* – If used as wildcard, it will match all files starting with abc. But if used as regular expression, it will match ab, abc, abcccc etc.
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