Computing from the Command Line

Preface Prerequisites Conventions Acknowledgements Feedback and Errata Author info License Book version Introduction and Setup Linux overview Linux Distros Access to Linux environment Setup Command Line Interface Chapters Resource lists Command Line Overview Hello Command Line File System Absolute and Relative paths Shells and Terminal Emulators Unix Philosophy Command Structure Command Network Scripting Command Help man type help whatis and whereis ch Further Reading Shortcuts and Autocompletion Real world use cases Exercises Managing Files and Directories Builtin and External commands pwd cd clear ls tree mkdir touch rm cp mv rename ln tar and gzip Exercises Shell Features Quoting mechanisms Wildcards Brace Expansion Extended and Recursive globs set Pipelines tee Redirection Redirecting output Redirecting input Redirecting error Combining stdout and stderr Waiting for stdin Here Documents Here Strings Further Reading Grouping commands List control operators Command substitution Process substitution Exercises Viewing Part or Whole File Contents cat tac less tail head Exercises Searching Files and Filenames grep Common options Literal search Regular Expressions Regexp examples Line comparisons between files Perl Compatible Regular Expression Recursive search grep and xargs Further Reading find Filenames File type Depth Age Size Acting on matched files Multiple criteria Prune find and xargs Further Reading locate Exercises File Properties wc du df stat touch file basename dirname chmod Exercises Managing Processes Definitions Running jobs in background ps pgrep kill top free Further Reading Exercises Multipurpose Text Processing Tools sed Substitution Inplace editing Filtering features Regexp substitution Further Reading awk Regexp filtering Awk special variables Default field processing Condition and Action Regexp field processing Record separators State machines Two files processing Removing duplicates Further Reading perl Basic one-liners Perl special variables Auto split Regexp field separator Powerful features Further Reading Exercises Sorting Stuff sort Common options Default sort Numerical sort Unique sort Column sort uniq Common options Default uniq Unique and duplicate entries Prefix count Partial match comm join Exercises Comparing Files cmp diff Common options Default diff Ignoring whitespaces Side-by-side output Further Reading Exercises Assorted Text Processing Tools seq shuf cut column tr paste pr rev split csplit xargs Exercises Shell Scripting Need for scripting Executable script Passing file argument to bash Sourcing script Comments Variables Arrays Parameter Expansion Command Line Arguments Conditional Expressions Options String comparisons Numeric comparisons Accepting user input interactively if then else for loop while loop Reading a file Functions Debugging shellcheck Resource lists Exercises Shell Customization Environment Variables Aliases and Functions Config files .bashrc .inputrc Further Reading Readline shortcuts Tab completion Searching history Moving the cursor Deleting characters Clear screen Swap words and characters Insert arguments Further Reading Copy and paste Exercises