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
Character classes in linux shellHere is the list of character classes in Linux. They are used in pattern matching.
- [:alpha:] matches letters only.
- [:digit:] matches numbers only.
- [:alnum:] matches letters and numbers only.
- [:xdigit:] matches hexadecimal numbers.
- [:lower:] matches a-z.
- [:upper:] matches A-Z.
- [:blank:] matches a space or a tab.
- [:space:] matches white space and horizontal tab.
- [:cntrl:] matches control characters.
- [:print:] Printable characters in the range of ASCII 32 – 126.
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