Overview
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Get an introduction to Linux bash scripting. Learn how to read and write Linux bash scripts, complete with local variables, functions, loops, and coprocesses, and use sed and AWK.
Syllabus
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Introduction
- Welcome
- What you should know
- Using the exercise files
- Exploring the Bash documentation
- Setting the script interpreter and permissions
- Time commands and set variables
- Bash startup
- Sourcing and aliasing with bash
- Displaying text with the echo command
- Challenges: Scripts with exported variables, sourcing, and echo
- Solutions: Scripts with exported variables, sourcing, and echo
- The typeset and declare commands for variables
- Looping with for/while sequences and reading input
- Defining functions and using return and exit
- Using file descriptors, file redirection, pipes, and here documents
- Control-flow case statements and if-then-else with the test command
- Using arithmetic operators
- Challenges: Using local variables in functions, loops, and arithmetic
- Solutions: Using local variables in functions, loops, and arithmetic
- Defining filters and using head, tail, and wc
- Using sed and AWK for more powerful scripting
- Positional parameters and operators with braces
- Challenges: Looping, special variable operators, sed, and AWK
- Solutions: Looping, special variable operators, sed, and AWK
- Using the coproc command
- Debugging scripts with -x and -u options
- Signals and traps
- Using the eval and getopt commands
- Challenges: Debugging scripts using trap, eval, getopt, and coproc
- Solutions: Debugging scripts using trap, eval, getopt, and coproc
- Next steps
