Bash Notes for Professionals book
Amazing collection of free programming books
Collecting
Free
Amazing collection of free programming books
The Notes for Professionals book is compiled from Stack Overflow Documentation, the content is written by the beautiful people at Stack Overflow. Text content is released under Creative Commons BY-SA. See credits at the end of this book whom contributed to the various chapters. Images may be copyright of their respective owners unless otherwise specified
Book created for educational purposes and is not affiliated with group(s), company(s) nor Stack Overflow. All trademarks belong to their respective company owners
https://goalkicker.com/
The Notes for Professionals book is compiled from Stack Overflow Documentation, the content is written by the beautiful people at Stack Overflow. Text content is released under Creative Commons BY-SA. See credits at the end of this book whom contributed to the various chapters. Images may be copyright of their respective owners unless otherwise specified
Book created for educational purposes and is not affiliated with group(s), company(s) nor Stack Overflow. All trademarks belong to their respective company owners
https://goalkicker.com/
Content
1-1Content list
1-2About
1-3Chapter 1: Getting started with Bash
1-4Section 1.1: Hello World
1-5Section 1.2: Hello World Using Variables
1-6Section 1.3: Hello World with User Input
1-7Section 1.4: Importance of Quoting in Strings
1-8Section 1.5: Viewing information for Bash built-ins
1-9Section 1.6: Hello World in "Debug" mode
1-10Section 1.7: Handling Named Arguments
1-11Chapter 2: Script shebang
1-12Section 2.1: Env shebang
1-13Section 2.2: Direct shebang
1-14Section 2.3: Other shebangs
1-15Chapter 3: Navigating directories
1-16Section 3.1: Absolute vs relative directories
1-17Section 3.2: Change to the last directory
1-18Section 3.3: Change to the home directory
1-19Section 3.4: Change to the Directory of the Script
1-20Chapter 4: Listing Files
1-21Section 4.1: List Files in a Long Listing Format
1-22Section 4.2: List the Ten Most Recently Modified Files
1-23Section 4.3: List All Files Including Dotfiles
1-24Section 4.4: List Files Without Using `ls`
1-25Section 4.5: List Files
1-26Section 4.6: List Files in a Tree-Like Format
1-27Section 4.7: List Files Sorted by Size
1-28Chapter 5: Using cat
1-29Section 5.1: Concatenate files
1-30Section 5.2: Printing the Contents of a File
1-31Section 5.3: Write to a file
1-32Section 5.4: Show non printable characters
1-33Section 5.5: Read from standard input
1-34Section 5.6: Display line numbers with output
1-35Section 5.7: Concatenate gzipped files
1-36Chapter 6: Grep
1-37Section 6.1: How to search a file for a pattern
1-38Chapter 7: Aliasing
1-39Section 7.1: Bypass an alias
1-40Section 7.2: Create an Alias
1-41Section 7.3: Remove an alias
1-42Section 7.4: The BASH_ALIASES is an internal bash assoc array
1-43Section 7.5: Expand alias
1-44Section 7.6: List all Aliases
1-45Chapter 8: Jobs and Processes
1-46Section 8.1: Job handling
1-47Section 8.2: Check which process running on specific port
1-48Section 8.3: Disowning background job
1-49Section 8.4: List Current Jobs
1-50Section 8.5: Finding information about a running process
1-51Section 8.6: List all processes
1-52Chapter 9: Redirection
1-53Section 9.1: Redirecting standard output
1-54Section 9.2: Append vs Truncate
1-55Section 9.3: Redirecting both STDOUT and STDERR
1-56Section 9.4: Using named pipes
1-57Section 9.5: Redirection to network addresses
1-58Section 9.6: Print error messages to stderr
1-59Section 9.7: Redirecting multiple commands to the same file
1-60Section 9.8: Redirecting STDIN
1-61Section 9.9: Redirecting STDERR
1-62Section 9.10: STDIN, STDOUT and STDERR explained
1-63Chapter 10: Control Structures
1-64Section 10.1: Conditional execution of command lists
1-65Section 10.2: If statement
1-66Section 10.3: Looping over an array
1-67Section 10.4: Using For Loop to List Iterate Over Numbers
1-68Section 10.5: continue and break
1-69Section 10.6: Loop break
1-70Section 10.7: While Loop
1-71Section 10.8: For Loop with C-style syntax
1-72Section 10.9: Until Loop
1-73Section 10.10: Switch statement with case
1-74Section 10.11: For Loop without a list-of-words parameter
1-75Chapter 11: true, false and : commands
1-76Section 11.1: Infinite Loop
1-77Section 11.2: Function Return
1-78Section 11.3: Code that will always/never be executed
1-79Chapter 12: Arrays
1-80Section 12.1: Array Assignments
1-81Section 12.2: Accessing Array Elements
1-82Section 12.3: Array Modification
1-83Section 12.4: Array Iteration
1-84Section 12.5: Array Length
1-85Section 12.6: Associative Arrays
1-86Section 12.7: Looping through an array
1-87Section 12.8: Destroy, Delete, or Unset an Array
1-88Section 12.9: Array from string
1-89Section 12.10: List of initialized indexes
1-90Section 12.11: Reading an entire file into an array
1-91Section 12.12: Array insert function
1-92Chapter 13: Associative arrays
1-93Section 13.1: Examining assoc arrays
1-94Chapter 14: Functions
1-95Section 14.1: Functions with arguments
1-96Section 14.2: Simple Function
1-97Section 14.3: Handling flags and optional parameters
1-98Section 14.4: Print the function definition
1-99Section 14.5: A function that accepts named parameters
1-100Section 14.6: Return value from a function
1-101Section 14.7: The exit code of a function is the exit code of its last command
1-102Chapter 15: Bash Parameter Expansion
1-103Section 15.1: Modifying the case of alphabetic characters
1-104Section 15.2: Length of parameter
1-105Section 15.3: Replace pattern in string
1-106Section 15.4: Substrings and subarrays
1-107Section 15.5: Delete a pattern from the beginning of a string
1-108Section 15.6: Parameter indirection
1-109Section 15.7: Parameter expansion and filenames
1-110Section 15.8: Default value substitution
1-111Section 15.9: Delete a pattern from the end of a string
1-112Section 15.10: Munging during expansion
1-113Section 15.11: Error if variable is empty or unset
1-114Chapter 16: Copying (cp)
1-115Section 16.1: Copy a single file
1-116Section 16.2: Copy folders
1-117Chapter 17: Find
1-118Section 17.1: Searching for a file by name or extension
1-119Section 17.2: Executing commands against a found file
1-120Section 17.3: Finding file by access / modification time
1-121Section 17.4: Finding files according to size
1-122Section 17.5: Filter the path
1-123Section 17.6: Finding files by type
1-124Section 17.7: Finding files by specific extension
1-125Chapter 18: Using sort
1-126Section 18.1: Sort command output
1-127Section 18.2: Make output unique
1-128Section 18.3: Numeric sort
1-129Section 18.4: Sort by keys
1-130Chapter 19: Sourcing
1-131Section 19.1: Sourcing a file
1-132Section 19.2: Sourcing a virtual environment
1-133Chapter 20: Here documents and here strings
1-134Section 20.1: Execute command with here document
1-135Section 20.2: Indenting here documents
1-136Section 20.3: Create a file
1-137Section 20.4: Here strings
1-138Section 20.5: Run several commands with sudo
1-139Section 20.6: Limit Strings
1-140Chapter 21: Quoting
1-141Section 21.1: Double quotes for variable and command substitution
1-142Section 21.2: Dierence between double quote and single quote
1-143Section 21.3: Newlines and control characters
1-144Section 21.4: Quoting literal text
1-145Chapter 22: Conditional Expressions
1-146Section 22.1: File type tests
1-147Section 22.2: String comparison and matching
1-148Section 22.3: Test on exit status of a command
1-149Section 22.4: One liner test
1-150Section 22.5: File comparison
1-151Section 22.6: File access tests
1-152Section 22.7: Numerical comparisons
1-153Chapter 23: Scripting with Parameters
1-154Section 23.1: Multiple Parameter Parsing
1-155Section 23.2: Argument parsing using a for loop
1-156Section 23.3: Wrapper script
1-157Section 23.4: Accessing Parameters
1-158Section 23.5: Split string into an array in Bash
1-159Chapter 24: Bash history substitutions
1-160Section 24.1: Quick Reference
1-161Section 24.2: Repeat previous command with sudo
1-162Section 24.3: Search in the command history by pattern
1-163Section 24.4: Switch to newly created directory with !#:N
1-164Section 24.5: Using !$
1-165Section 24.6: Repeat the previous command with a substitution
1-166Chapter 25: Math
1-167Section 25.1: Math using dc
1-168Section 25.2: Math using bash capabilities
1-169Section 25.3: Math using bc
1-170Section 25.4: Math using expr
1-171Chapter 26: Bash Arithmetic
1-172Section 26.1: Simple arithmetic with (( ))
1-173Section 26.2: Arithmetic command
1-174Section 26.3: Simple arithmetic with expr
1-175Chapter 27: Scoping
1-176Section 27.1: Dynamic scoping in action
1-177Chapter 28: Process substitution
1-178Section 28.1: Compare two files from the web
1-179Section 28.2: Feed a while loop with the output of a command
1-180Section 28.3: Concatenating files
1-181Section 28.4: Stream a file through multiple programs at once
1-182Section 28.5: With paste command
1-183Section 28.6: To avoid usage of a sub-shell
1-184Chapter 29: Programmable completion
1-185Section 29.1: Simple completion using function
1-186Section 29.2: Simple completion for options and filenames
1-187Chapter 30: Customizing PS1
1-188Section 30.1: Colorize and customize terminal prompt
1-189Section 30.2: Show git branch name in terminal prompt
1-190Section 30.3: Show time in terminal prompt
1-191Section 30.4: Show a git branch using PROMPT_COMMAND
1-192Section 30.5: Change PS1 prompt
1-193Section 30.6: Show previous command return status and time
1-194Chapter 31: Brace Expansion
1-195Section 31.1: Modifying filename extension
1-196Section 31.2: Create directories to group files by month and year
1-197Section 31.3: Create a backup of dotfiles
1-198Section 31.4: Use increments
1-199Section 31.5: Using brace expansion to create lists
1-200Section 31.6: Make Multiple Directories with Sub-Directories
1-201Chapter 32: getopts : smart positional-parameter parsing
1-202Section 32.1: pingnmap
1-203Chapter 33: Debugging
1-204Section 33.1: Checking the syntax of a script with "-n"
1-205Section 33.2: Debugging using bashdb
1-206Section 33.3: Debugging a bash script with "-x"
1-207Chapter 34: Pattern matching and regular expressions
1-208Section 34.1: Get captured groups from a regex match against a string
1-209Section 34.2: Behaviour when a glob does not match anything
1-210Section 34.3: Check if a string matches a regular expression
1-211Section 34.4: Regex matching
1-212Section 34.5: The * glob
1-213Section 34.6: The ** glob
1-214Section 34.7: The ? glob
1-215Section 34.8: The [ ] glob
1-216Section 34.9: Matching hidden files
1-217Section 34.10: Case insensitive matching
1-218Section 34.11: Extended globbing
1-219Chapter 35: Change shell
1-220Section 35.1: Find the current shell
1-221Section 35.2: List available shells
1-222Section 35.3: Change the shell
1-223Chapter 36: Internal variables
1-224Section 36.1: Bash internal variables at a glance
1-225Section 36.2: $@
1-226Section 36.3: $#
1-227Section 36.4: $HISTSIZE
1-228Section 36.5: $FUNCNAME
1-229Section 36.6: $HOME
1-230Section 36.7: $IFS
1-231Section 36.8: $OLDPWD
1-232Section 36.9: $PWD
1-233Section 36.10: $1 $2 $3 etc..
1-234Section 36.11: $*
1-235Section 36.12: $!
1-236Section 36.13: $?
1-237Section 36.14: $$
1-238Section 36.15: $RANDOM
1-239Section 36.16: $BASHPID
1-240Section 36.17: $BASH_ENV
1-241Section 36.18: $BASH_VERSINFO
1-242Section 36.19: $BASH_VERSION
1-243Section 36.20: $EDITOR
1-244Section 36.21: $HOSTNAME
1-245Section 36.22: $HOSTTYPE
1-246Section 36.23: $MACHTYPE
1-247Section 36.24: $OSTYPE
1-248Section 36.25: $PATH
1-249Section 36.26: $PPID
1-250Section 36.27: $SECONDS
1-251Section 36.28: $SHELLOPTS
1-252Section 36.29: $_
1-253Section 36.30: $GROUPS
1-254Section 36.31: $LINENO
1-255Section 36.32: $SHLVL
1-256Section 36.33: $UID
1-257Chapter 37: Job Control
1-258Section 37.1: List background processes
1-259Section 37.2: Bring a background process to the foreground
1-260Section 37.3: Restart stopped background process
1-261Section 37.4: Run command in background
1-262Section 37.5: Stop a foreground process
1-263Chapter 38: Case statement
1-264Section 38.1: Simple case statement
1-265Section 38.2: Case statement with fall through
1-266Section 38.3: Fall through only if subsequent pattern(s) match
1-267Chapter 39: Read a file (data stream, variable) line-by-line (and/or field-by-field)?
1-268Section 39.1: Looping through a file line by line
1-269Section 39.2: Looping through the output of a command field by field
1-270Section 39.3: Read lines of a file into an array
1-271Section 39.4: Read lines of a string into an array
1-272Section 39.5: Looping through a string line by line
1-273Section 39.6: Looping through the output of a command line by line
1-274Section 39.7: Read a file field by field
1-275Section 39.8: Read a string field by field
1-276Section 39.9: Read fields of a file into an array
1-277Section 39.10: Read fields of a string into an array
1-278Section 39.11: Reads file (/etc/passwd) line by line and field by field
1-279Chapter 40: File execution sequence
1-280Section 40.1: .profile vs .bash_profile (and .bash_login)
1-281Chapter 41: Splitting Files
1-282Section 41.1: Split a file
1-283Chapter 42: File Transfer using scp
1-284Section 42.1: scp transferring file
1-285Section 42.2: scp transferring multiple files
1-286Section 42.3: Downloading file using scp
1-287Chapter 43: Pipelines
1-288Section 43.1: Using |&
1-289Section 43.2: Show all processes paginated
1-290Section 43.3: Modify continuous output of a command
1-291Chapter 44: Managing PATH environment variable
1-292Section 44.1: Add a path to the PATH environment variable
1-293Section 44.2: Remove a path from the PATH environment variable
1-294Chapter 45: Word splitting
1-295Section 45.1: What, when and Why?
1-296Section 45.2: Bad eects of word splitting
1-297Section 45.3: Usefulness of word splitting
1-298Section 45.4: Splitting by separator changes
1-299Section 45.5: Splitting with IFS
1-300Section 45.6: IFS & word splitting
1-301Chapter 46: Avoiding date using printf
1-302Section 46.1: Get the current date
1-303Section 46.2: Set variable to current time
1-304Chapter 47: Using "trap" to react to signals and system events
1-305Section 47.1: Introduction: clean up temporary files
1-306Section 47.2: Catching SIGINT or Ctl+C
1-307Section 47.3: Accumulate a list of trap work to run at exit
1-308Section 47.4: Killing Child Processes on Exit
1-309Section 47.5: react on change of terminals window size
1-310Chapter 48: Chain of commands and operations
1-311Section 48.1: Counting a text pattern ocurrence
1-312Section 48.2: transfer root cmd output to user file
1-313Section 48.3: logical chaining of commands with && and ||
1-314Section 48.4: serial chaining of commands with semicolon
1-315Section 48.5: chaining commands with |
1-316Chapter 49: Type of Shells
1-317Section 49.1: Start an interactive shell
1-318Section 49.2: Detect type of shell
1-319Section 49.3: Introduction to dot files
1-320Chapter 50: Color script output (cross-platform)
1-321Section 50.1: color-output.sh
1-322Chapter 51: co-processes
1-323Section 51.1: Hello World
1-324Chapter 52: Typing variables
1-325Section 52.1: declare weakly typed variables
1-326Chapter 53: Jobs at specific times
1-327Section 53.1: Execute job once at specific time
1-328Section 53.2: Doing jobs at specified times repeatedly using systemd.timer
1-329Chapter 54: Handling the system prompt
1-330Section 54.1: Using the PROMPT_COMMAND envrionment variable
1-331Section 54.2: Using PS2
1-332Section 54.3: Using PS3
1-333Section 54.4: Using PS4
1-334Section 54.5: Using PS1
1-335Chapter 55: The cut command
1-336Section 55.1: Only one delimiter character
1-337Section 55.2: Repeated delimiters are interpreted as empty fields
1-338Section 55.3: No quoting
1-339Section 55.4: Extracting, not manipulating
1-340Chapter 56: Bash on Windows 10
1-341Section 56.1: Readme
1-342Chapter 57: Cut Command
1-343Section 57.1: Show the first column of a file
1-344Section 57.2: Show columns x to y of a file
1-345Chapter 58: global and local variables
1-346Section 58.1: Global variables
1-347Section 58.2: Local variables
1-348Section 58.3: Mixing the two together
1-349Chapter 59: CGI Scripts
1-350Section 59.1: Request Method: GET
1-351Section 59.2: Request Method: POST /w JSON
1-352Chapter 60: Select keyword
1-353Section 60.1: Select keyword can be used for getting input argument in a menu format
1-354Chapter 61: When to use eval
1-355Section 61.1: Using Eval
1-356Section 61.2: Using Eval with Getopt
1-357Chapter 62: Networking With Bash
1-358Section 62.1: Networking commands
1-359Chapter 63: Parallel
1-360Section 63.1: Parallelize repetitive tasks on list of files
1-361Section 63.2: Parallelize STDIN
1-362Chapter 64: Decoding URL
1-363Section 64.1: Simple example
1-364Section 64.2: Using printf to decode a string
1-365Chapter 65: Design Patterns
1-366Section 65.1: The Publish/Subscribe (Pub/Sub) Pattern
1-367Chapter 66: Pitfalls
1-368Section 66.1: Whitespace When Assigning Variables
1-369Section 66.2: Failed commands do not stop script execution
1-370Section 66.3: Missing The Last Line in a File
1-371Appendix A: Keyboard shortcuts
1-372Section A.1: Editing Shortcuts
1-373Section A.2: Recall Shortcuts
1-374Section A.3: Macros
1-375Section A.4: Custome Key Bindings
1-376Section A.5: Job Control
1-377Credits
1-378You may also like
FAQ
您可以透過手機、平板或是電腦登入 HiSKIO 平台，在【我的學習】＞【我的書籍】頁面，選擇想看的電子書。
Recommendations
Reviews
| Collecting