Igor Delovski Board

[XNote]

Apple Developer Connection: Mac OS X Shell Scripting

"Shell scripts are a fundamental part of the Mac OS X programming
environment. As a ubiquitous feature of UNIX-based, Linux, and UNIX-like
operating systems, they represent a way of writing certain types of
command-line tools in a way that works on a fairly broad spectrum of
computing platforms."

[XNote]

Digg: Automate windows tasks with this simple scripting language

"AutoIt v3 is a freeware BASIC-like scripting language designed for
automating the Windows GUI and general scripting. It uses a combination
of simulated keystrokes, mouse movement and window/control
manipulation in order to automate tasks in a way not possible or reliable
with other languages."

[delovski]

JoS: Learning Shell Scripting

"I would like to learn how to write UNIX shell scripts, but I would like to do
so under some sort of emulator under Windows. I currently have Cygwin but
cannot get it to run my 'hello world' script. Does it execute shell scripts? If so,
how?"

[delovski]

Digg: Introduction to Open Source Scripting on Mac OS X

"If you're new to the world of open source scripting languages —or just want
to brush up on what's unique about Mac OS X—this article will help you get
oriented. Mac OS X bundles the most popular scripting languages out of the
box: perl, Python, php, tcl, Ruby—not to mention shells such as bash, ksh,
zsh, and csh."

[delovski]

dartmouth.edu - Macintosh Scripting Systems

"Discussion of the various scripting systems for Apple Macintosh computers
including Userland's Frontier, Apple's AppleScript, and any others. Users
are encouraged to share any technical information and interesting scripts they
have and post technical questions. Postings from America Online CompuServe,
and AppleLink will be gatewayed to this list. This list is unmoderated."

[delovski]

uf - How can I start ./app in the current directory when make did ok?

"Gedit has the Ctrl+f8 shortcut to automatically invoke make. I added
another command "Build and run", which performs the same as "Build",
but at the end when make finishes successful, tries to start ./app. How
would look the code for that?"

[Ike]

reddit - Bash users: What do you have for your $PS1?

"Mine's horribly complicated and includes..."

[delovski]

Beginning SSH on Ubuntu

"SSH is a powerful tool which allows secure remote login over insecure net-
works. It provides an encrypted terminal session with strong authentication
of both the server and client using public-key cryptography. This tutorial will
cover the basics of SSH’s most useful features..."

[Ike]

CW - The A-Z of Programming Languages: Bourne shell, or sh

"An in-depth interview with Steve Bourne, creator of the Bourne shell, or sh.

Through this work, and a series of connections and circumstance, Bourne got
to know people at Bell Labs who then offered him a job in the Unix group in
1975. It was during this time Bourne developed sh."

[delovski]

Command-Line-Fu

"Command-Line-Fu is the place to record those command-line gems that
you return to again and again. All commands can be commented on and
discussed - digg-esque voting is also encouraged so the best float to the
top."

[delovski]

MF - Bash script to zip multiple directories?

"I need to put together a bash script that will read in a text file containing a
list of directories (one per line) and for each line output a separate archive."

[Ike]

cyberciti.biz - Howto: Linux Rename Multiple Files At a Shell Prompt

"Rename command syntax

rename oldname newname *.files
For example rename all *.bak file as *.txt, enter:
$ rename .bak .txt *.bak

Renaming multiple files at a shell prompt is always considered as a black art
by many UNIX gurus."

[Ike]

macgasm.net - Good Morning, Your Mac Keeps A Log Of All Your Downloads

"According to OS X Daily the Launch Services quarantine keeps a list of
every file you’ve ever downloaded on your Mac, as that’s what triggers
the warning dialog about opening files from the Internet."

[delovski]

github - Awesome OSX Command Line

"A curated list of shell commands and tools specific to OS X.

'You don't have to know everything. You simply need to know where to find
it when necessary.' (John Brunner)"

[Ike]

so - How to check if a variable is set in Bash?

Here's how to test whether a parameter is unset, or empty ("Null") or set with a value:

[Ike]

grymoire.com - Sh - the Bourne Shell

"Bourne Shell, and filename expansion
Shell Concepts
Verifying which shell you are running
Shell basics
Meta-characters and Filename expansion
Finding the executable
Quoting with the Bourne Shell
Nested quotations
Strong versus weak quoting
Quoting over several lines
Mixing quotation marks
Quotes within quotes - take two
Placing variables within strings
Variables
A subtle point
The set command
Environment Variables
Special Environment Variables
PATH - Sets searchpath
HOME - Your home directory
CDPATH - cd searchpath
IFS - Internal Field Seperator
PS1 - Normal Prompt
PS2 - Secondary Prompt
MAIL - Incoming mail
MAILCHECK - How often to check for mail
SHACCT - Accounting file
MAILPATH - searchpath for mail folders
Bourne Shell Variables - Alternate Formats
Using quoting and shell variables
Using curly braces with variables
${variable?value} - Complain if undefined
${variable-default} - Use default if undefined
${variable+value} - Change if defined
${variable=value} - Redefine if undefined
Undefining Variables
${x:-y}, ${x:=y}, ${x:?y}, ${x:+y} forms
Order of evaluation
Special Variables in the Bourne Shell
Positional Parameters $1, $2, ..., $9
$0 - Scriptname
$* - All positional parameters
$@ - All positional parameters with spaces
$# - Number of parameters
$$ - Current process ID
$! - ID of Background job
$? - error status
$- Set variables
Options and debugging
Special options
X - Bourne Shell echo flag
V - Bourne Shell verbose flag
Combining flags
U - unset variables
N - Bourne Shell non-execute flag
E - Bourne Shell exit flag
T - Bourne Shell test one command flag
A - Bourne Shell mark for export flag
K - Bourne Shell keyword flag
H - Bourne Shell hash functions flag
The $- variable
- - Bourne Shell hyphen option
Other options
C - Bourne Shell command option
S - Bourne Shell shell-session option
I - Bourne Shell shell-interactive option
R - Bourne Shell restricted shell option
P - Bourne Shell privileged shell option
unset
Bourne Shell: Status, Pipes and branches
Unnecessary process execution
$@ versus ${1+$@}
Status and Wasted Processes
Simple Flow Control
Changing Precedence
Putting it all together
Bourne Shell Flow Control Commands: If, While and Until
Commands that must be first on the line
While - loop while true
Until - loop until true
Bourne Shell Flow Control Commands
For - Repeating while changing a variable
Case - Checking multiple cases
Break and continue
Expr - Bourne Shell Expression Evaluator
Arithmetic Operators
Relational Operators
Boolean Operators
The string operator
Precedence of the Operators
Berkeley Extensions
Bourne Shell -- Functions and argument checking
Passing values by name
Exiting from a function
Checking the number of arguments
UNIX conventions for command line arguments
Checking for optional arguments
Job Control"

[delovski]

so - How do I monitor opened files of a process in realtime?

"You can also attach strace to a running process with the -p PID option."

[delovski]

Thomas Keller - ACLs on Mac OS X

"The first thing to notice is that starting with Mac OS X 10.6 (Snow Leopard)
ACLs are always enabled and cannot be disabled as in earlier versions. All ACL
commands are baked into the chmod command and parsed from a string you
give it with the '+a' option."

[Ike]

superuser.com - Recursively count all the files in a directory

"Explanation: find . -type f finds all files ( -type f ) in this ( . ) directory and
in all sub directories, the filenames are then printed to standard out one per
line"

[Ike]

git - Args - An easy-to-use C library for parsing command line arguments

"Long-form boolean flags with single-character shortcuts: --flag, -f.
Long-form string, integer, and floating-point options with single-character
shortcuts: --option <arg>, -o <arg>.
Condensed short-form options: -abc <arg> <arg>.
Automatic --help and --version flags.
Support for multivalued options.
Support for git-style command interfaces with arbitrarily-nested commands."

[Ike]

How to Use SSH Public Key Authentication

"However, using public key authentication provides many benefits when
working with multiple developers. For example, with SSH keys you can

* allow multiple developers to log in as the same system user without having to share a single password between them;
* revoke a single developer's access without revoking access by other developers; and
* make it easier for a single developer to log in to many accounts without needing to manage many different passwords."

[Ike]

so - Can I put a breakpoint in shell script?

"alias combined with eval gives you basic functionality of breakpoints in
calling context"

https://www.baeldung.com/linux/debug-bash-script

Redirecting Only the Debug Output to a File...