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${parameter+alt_value}
${parameter:+alt_value}
Alternate value of parameter, if set
• 
${parameter-default}
${parameter:-default}
${parameter=default}
${parameter:=default}
Default parameters
• 
${!varprefix*}
${!varprefix@}
Parameter name match
• 
${parameter?err_msg}
Parameter-unset message
• 
${parameter}
Value of parameter
• 
Case modification (version 4+ of Bash).
• 
Script example
• 
Table of parameter substitution
• 
Parent / child process problem, a child process cannot export variables to a parent process
Parentheses
Command group
• 
Enclose group of Extended Regular Expressions
• 
Double parentheses, in arithmetic expansion
• 
$PATH, the path (location of system binaries)
Appending directories to $PATH using the += operator.
• 
Pathname, a filename that incorporates the complete path of a given file.
Parsing pathnames
• 
Perl, programming language
Combined in the same file with a Bash script
• 
Embedded in a Bash script
• 
Perquackey-type anagramming game (Quackey script)
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
885
How to add text to a pdf file in preview - insert text into PDF content in C#.net, ASP.NET, MVC, Ajax, WinForms, WPF
XDoc.PDF for .NET, providing C# demo code for inserting text to PDF file
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How to add text to a pdf file in preview - VB.NET PDF insert text library: insert text into PDF content in vb.net, ASP.NET, MVC, Ajax, WinForms, WPF
Providing Demo Code for Adding and Inserting Text to PDF File Page in VB.NET Program
add text to a pdf document; add text field pdf
Petals Around the Rose
PID, Process ID, an identification number assigned to a running process.
Pipe, | , a device for passing the output of a command to another command or to the shell
Avoiding unnecessary commands in a pipe
• 
Comments embedded within
• 
Exit status of a pipe
• 
Pipefail, set -o pipefail option to indicate exit status within a pipe
• 
$PIPESTATUS, exit status of last executed pipe
• 
Piping output of a command to a script
• 
Redirecting stdin, rather than using cat in a pipe
• 
Pitfalls
- (dash) is not redirection operator
• 
// (double forward slash), behavior of cd command toward
• 
#!/bin/sh script header disables extended Bash features
• 
Abuse of cat
• 
CGI programming, using scripts for
• 
Closing limit string in a here document, indenting
• 
DOS-type newlines (\r\n) crash a script
• 
Double-quoting the backslash (\) character
• 
eval, risk of using
• 
Execute permission lacking for commands within a script
• 
Exit status, anomalous
• 
Exit status of arithmetic expression not equivalent to an error code
• 
Export problem, child process to parent process
• 
Extended Bash features not available
• 
Failing to quote variables within test brackets
• 
GNU command set, in cross-platform scripts
• 
let misuse: attempting to set string variables
• 
Multiple echo statements in a function whose output is captured
• 
null variable assignment
• 
Numerical and string comparison operators not equivalent
= and -eq not interchangeable
• 
Omitting terminal semicolon, in a curly-bracketed code block
• 
Piping
echo to a loop
echo to read (however, this problem can be circumvented)
tail -f to grep
• 
Preserving whitespace within a variable, unintended consequences
• 
suid commands inside a script
• 
Undocumented Bash features, danger of
• 
Updates to Bash breaking older scripts
• 
Uninitialized variables
• 
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
886
C# WinForms Viewer: Load, View, Convert, Annotate and Edit PDF
Add text to PDF document in preview. • Add text box to PDF file in preview. • Draw PDF markups. PDF Protection. • Sign PDF document with signature.
adding text to pdf in reader; how to add text boxes to pdf
C# WinForms Viewer: Load, View, Convert, Annotate and Edit
Convert CSV file to PDF (.pdf). Add, remove and save annotations to CSV file. Protection. Miscellaneous. • Select text on OpenOffice.
adding text to a pdf document acrobat; add text field to pdf
Variable names, inappropriate
• 
Variables in a subshell, scope limited
• 
Subshell in while-read loop
• 
Whitespace, misuse of
• 
Pointers
and file descriptors
• 
and functions
• 
and indirect references
• 
and variables
• 
Portability issues in shell scripting
Setting path and umask
• 
A test suite script (Bash versus classic Bourne shell)
• 
Using whatis
• 
Positional parameters
$@, as separate words
• 
$*, as a single word
• 
in functions
• 
POSIX, Portable Operating System Interface / UNIX
--posix option
• 
1003.2 standard
• 
Character classes
• 
$PPID, process ID of parent process
Precedence, operator
Prepending lines at head of a file, script example
Prime numbers
Generating primes using the factor command
• 
Generating primes using the modulo operator
• 
Sieve of Eratosthenes, example script
• 
printf, formatted print command
/proc directory
Running processes, files describing
• 
Writing to files in /proc, warning
• 
Process
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
887
VB.NET PDF File Compress Library: Compress reduce PDF size in vb.
Also a preview component enables compressing and decompressing in preview in ASP.NET class. Also able to uncompress PDF file in VB.NET programs.
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How to C#: Preview Document Content Using XDoc.Word
With the SDK, you can preview the document content according to the preview thumbnail by the ways as following. C# DLLs for Word File Preview. Add references:
adding text to pdf file; how to add a text box in a pdf file
Child process
• 
Parent process
• 
Process ID (PID)
• 
Process substitution
To compare contents of directories
• 
To supply stdin of a command
• 
Template
• 
while-read loop without a subshell
• 
Programmable completion (tab expansion)
Prompt
$PS1, Main prompt, seen at command line
• 
$PS2, Secondary prompt
• 
Pseudo-code, as problem-solving method
$PWD, Current working directory
* * *
Quackey, a Perquackey-type anagramming game (script)
Question mark, ?
Character match in an Extended Regular Expression
• 
Single-character wild card, in globbing
• 
In a C-style Trinary (ternary) operator
• 
Quoting
Character string
• 
Variables
within test brackets
• 
Whitespace, using quoting to preserve
• 
* * *
Random numbers
/dev/urandom
• 
rand(), random function in awk
• 
$RANDOM, Bash function that returns a pseudorandom integer
• 
Random sequence generation, using date command
• 
Random sequence generation, using jot
• 
Random string, generating
• 
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
888
How to C#: Preview Document Content Using XDoc.PowerPoint
bitmap of the first page in the PowerPoint document file. C# DLLs: Preview PowerPoint Document. Add necessary XDoc.PowerPoint DLL libraries into your created C#
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C# PDF insert image Library: insert images into PDF in C#.net, ASP
position and save existing PDF file or output a new PDF file. Insert images into PDF form field. How to insert and add image, picture, digital photo, scanned
add text pdf file acrobat; adding text to a pdf in acrobat
Raspberry Pi (single-board computer)
Script for preparing a bootable SD card
• 
rcs
read, set value of a variable from stdin
Detecting arrow keys
• 
Options
• 
Piping output of cat to read
• 
"Prepending" text
• 
Problems piping echo to read
• 
Redirection from a file to read
• 
$REPLY, default read variable
• 
Timed input
• 
while read construct
• 
readline library
Recursion
Demonstration of
• 
Factorial
• 
Fibonacci sequence
• 
Local variables
• 
Script calling itself recursively
• 
Towers of Hanoi
• 
Redirection
Code blocks
• 
exec <filename,
to reassign file descriptors
• 
Introductory-level explanation of I/O redirection
• 
Open a file for both reading and writing
<>filename
• 
read input redirected from a file
• 
stderr to stdout
2>&1
• 
stdin / stdout, using -
• 
stdinof a function
• 
stdout to a file
> ... >>
• 
stdout to file descriptor j
>&j
• 
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
889
VB.NET PDF insert image library: insert images into PDF in vb.net
try with this sample VB.NET code to add an image As String = Program.RootPath + "\\" 1.pdf" Dim doc New PDFDocument(inputFilePath) ' Get a text manager from
add text box in pdf document; add text to pdf acrobat
C# PDF File Split Library: Split, seperate PDF into multiple files
page of your defined page number which starts from 0. For example, your original PDF file contains 4 pages. C# DLLs: Split PDF Document. Add necessary references
add text block to pdf; how to insert text box on pdf
file descriptori to file descriptor j
i>&j
• 
stdout of a command to stderr
>&2
• 
stdout and stderr of a command to a file
&>
• 
tee, redirect to a file output of command(s) partway through a pipe
• 
Reference Cards
Miscellaneous constructs
• 
Parameter substitution/expansion
• 
Special shell variables
• 
String operations
• 
Test operators
Binary comparison
Files
• 
Regular Expressions
^ (caret) Beginning-of-line
• 
$ (dollar sign) Anchor
• 
. (dot) Match single character
• 
* (asterisk) Any number of characters
• 
[ ] (brackets) Enclose character set to match
• 
\ (backslash) Escape, interpret following character literally
• 
\< ... \> (angle brackets, escaped) Word boundary
• 
Extended REs
+Character match
\{ \} Escaped "curly" brackets
[: :] POSIX character classes
• 
$REPLY, Default value associated with read command
Restricted shell, shell (or script) with certain commands disabled
return, command that terminates a function
run-parts
Running scripts in sequence, without user intervention
• 
* * *
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
890
VB.NET PDF File Split Library: Split, seperate PDF into multiple
page PDF document file to one-page PDF files or they can separate source PDF file to smaller VB.NET PDF Splitting & Disassembling DLLs. Add necessary references
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Scope of a variable, definition
Script options, set at command line
Scripting routines, library of useful definitions and functions
Secondary prompt, $PS2
Security issues
nmap, network mapper / port scanner
• 
sudo
• 
suid commands inside a script
• 
Viruses, trojans, and worms in scripts
• 
Writing secure scripts
• 
sed, pattern-based programming language
Table, basic operators
• 
Table, examples of operators
• 
select, construct for menu building
in list omitted
• 
Semaphore
Semicolon required, when do keyword is on first line of loop
When terminating curly-bracketed code block
• 
seq, Emit a sequence of integers. Equivalent to jot.
set, Change value of internal script variables
set -u, Abort script with error message if attempting to use an undeclared variable.
• 
Shell script, definition of
Shell wrapper, script embedding a command or utility
shift, reassigning positional parameters
$SHLVL, shell level, depth to which the shell (or script) is nested
shopt, change shell options
Signal, a message sent to a process
Simulations
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
891
Brownian motion
• 
Galton board
• 
Horserace
• 
Life, game of
• 
PI, approximating by firing cannonballs
• 
Pushdown stack
• 
Single quotes (' ... ') strong quoting
Socket, a communication node associated with an I/O port
Sorting
Bubble sort
• 
Insertion sort
• 
source, execute a script or, within a script, import a file
Passing positional parameters
• 
Spam, dealing with
Example script
• 
Example script
• 
Example script
• 
Example script
• 
Special characters
Stack
Definition
• 
Emulating a push-down stack, example script
• 
Standard Deviation, example script
Startup files, Bash
stdin and stdout
Stopwatch, example script
Strings
=~ String match operator
• 
Comparison
• 
Length
${#string}
• 
Manipulation
• 
Manipulation, using awk
• 
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
892
Null string, testing for
• 
Protecting strings from expansion and/or reinterpretation, script example
Unprotecting strings, script example
• 
strchr(), equivalent of
• 
strlen(), equivalent of
• 
strings command, find printable strings in a binary or data file
• 
Substring extraction
${string:position}
${string:position:length}
Using expr
• 
Substring index (numerical position in string)
• 
Substring matching, using expr
• 
Substring removal
${var#Pattern}
${var##Pattern}
${var%Pattern}
${var%%Pattern}
• 
Substring replacement
${string/substring/replacement}
${string//substring/replacement}
${string/#substring/replacement}
${string/%substring/replacement}
Script example
• 
Table of string/substring manipulation and extraction operators
• 
Strong quoting ' ... '
Stylesheet for writing scripts
Subshell
Command list within parentheses
• 
Variables, $BASH_SUBSHELL and $SHLVL
• 
Variables in a subshell
scope limited, but ...
... can be accessed outside the subshell?
• 
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
893
su Substitute user, log on as a different user or as root
suid (set user id) file flag
suid commands inside a script, not advisable
• 
Symbolic links
Swapfiles
* * *
Tab completion
Table lookup, script example
tail, echo to stdout lines at the (tail) end of a text file
tar, archiving utility
tee, redirect to a file output of command(s) partway through a pipe
Terminals
setserial
• 
setterm
• 
• stty
tput
• 
wall
• 
test command
Bash builtin
• 
external command, /usr/bin/test (equivalent to /usr/bin/[)
• 
Test constructs
Test operators
-a Logical AND compound comparison
• 
-e File exists
• 
-eq is-equal-to (integer comparison)
• 
-f File is a regular file
• 
-ge greater-than or equal (integer comparison)
• 
-gt greater-than (integer comparison)
• 
-le less-than or equal (integer comparison)
• 
-lt less-than (integer comparison)
• 
-n not-zero-length (string comparison)
• 
-ne not-equal-to (integer comparison)
• 
-o Logical OR compound comparison
• 
-u suid flag set, file test
• 
Advanced Bash-Scripting Guide
Appendix T. ASCII Table
894
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