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edited Jun 29, 2017 at 10:35$? is used to find the return value of the last executed command. Try the following in the shell:
ls somefileecho $?If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default "success" return value). If it doesn't exist, you should get a number other then 0. The exact number depends on the program.
For many programs you can find the numbers and their meaning in the corresponding man page. These will usually be described as "exit status" and may have their o...
Content Under CC-BY-SA license 15 Special Characters You Need to Know for Bash - How-To Geek
There are a set of characters the Bash shelltreats in two different ways. When you type them at the shell, they act as instructions or commands and tell the shell to perform a certain function. Think of them as single-character commands. Sometimes, you just want to print a character and don't need it to act as a … See more
The tilde (~) is shorthand for your home directory. It means you don't have to type the full path to your home directory in commands. Wherever you are in the filesystem, you can … See more
A period (.) represents the current directory. You see it in directory listings if you use the -a (all) option with ls. You can also use the period in commands to represent the path to your current directory. For example, if you want to run a script from the … See more
The double period or "double dot" (..) represents the parent directory of your current one. You can use this to move up one level in the directory tree. You can also use this … See more
You can use a forward-slash (/)---often just called a slash---to separate the directories in a pathname. One forward-slash represents the shortest possible directory path. Because everything in the Linux directory tree starts at the root directory, you can use this … See more
What is the $? (dollar question mark) variable in shell scripting?
WEBTry the following in the shell: ls somefile. echo $? If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should …
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What Are the Special Dollar Sign Shell Variables? - Baeldung
WEBJul 6, 2024 · The dollar sign ($) plays a crucial role in shell scripting. This ranges from argument handling to process management, and even providing information about the …
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What does $# mean in shell? - Unix & Linux Stack Exchange
WEBthe number of parameters with which the script has been called. the number of parameters which have been set within the script by set -- foo bar. (when used within a …
Bash Special Variables ($0, $?, $#, $@, $$, $*) – TecAdmin
WEBMar 15, 2023 · In this article, we’ll provide an in-depth guide to all bash special variables, including examples of their usage and common pitfalls to avoid. ` $0 ` – The name of the …
linux - What is the meaning of $? in a shell script? - Unix & Linux ...
WEB$$-The process number of the current shell. For shell scripts, this is the process ID under which they are executing.
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What does $# mean in bash? - Ask Ubuntu
WEBJul 25, 2017 · $# is the number of positional parameters passed to the script, shell, or shell function. This is because, while a shell function is running, the positional …
What is $* and $# in Linux? - Super User
WEBSo basically, $# is a number of arguments given when your script was executed. $* is a string containing all arguments. For example, $1 is the first argument and so on. This is …
Handling Special Characters in Shell Scripts | Baeldung on Linux
WEBMar 18, 2024 · Overview. Sometimes, when we write shell scripts, we have to deal with special characters like spaces, symbols, and other non-ASCII characters. These …
What’s the Difference Between $* and $@ in Bash? - Baeldung
WEBMar 18, 2024 · In Bash scripting, understanding the difference between $* and $@ is crucial for handling command-line arguments correctly. We use both variables to represent the …
Shell Scripting for Beginners – How to Write Bash Scripts in Linux
WEBMar 31, 2022 · When a shell is used interactively, it displays a $ when it is waiting for a command from the user. This is called the shell prompt. [username@host ~]$ If shell is …
Difference between ${} and $() in a shell script - Super User
WEB3 Answers. Sorted by: 76. $(command) is “command substitution”. As you seem to understand, it runs the command, captures its output, and inserts that into the command …
Basic Operators in Shell Scripting - GeeksforGeeks
WEBJul 30, 2024 · Learn how to use arithmetic, relational, logical, bitwise and file test operators in bash/shell scripting. The web page explains the syntax, examples and output of each …
Bash $$ Variable: What Does It Mean? How Can You Use it?
WEBFeb 7, 2021 · Learn how to use the Bash internal variable $$ that contains the Process ID (PID) of the shell running your script. Compare it with the variable $BASHPID and see …
scripting - What does $$ mean in the shell? - Stack Overflow
WEBSep 17, 2008 · The $$ is the process id of the shell in which your script is running. For more details, see the man page for sh or bash. The man pages can be found be either …
What's the difference between <<, <<< and < < in bash?
WEBSep 27, 2015 · As you can see, the shell creates temporary file descriptor /dev/fd/63 where the output goes (which according to Gilles's answer, is an anonymous pipe). That …
Special Parameters (Bash Reference Manual)
WEB($$) Expands to the process ID of the shell. In a subshell, it expands to the process ID of the invoking shell, not the subshell. Expands to the process ID of the job most recently …
What’s the Meaning of $! in Bash Scripting | Baeldung on Linux
WEBMar 18, 2024 · The $! variable is a special shell variable that stores the PID of the most recently executed background process. A background process, also known as a …
linux - What does $@ mean in a shell script? - Stack Overflow
WEBApr 3, 2012 · Meaning. In brief, $@ expands to the arguments passed from the caller to a function or a script. Its meaning is context-dependent: Inside a function, it expands to …
bash - Shell equality operators (=, ==, -eq) - Stack Overflow
WEBAs a string operator, = is equivalent to ==. Also, note the whitespace around = or ==: it’s required. While you can do [[ 1 == 1 ]] or [[ $(( 1+1 )) == 2 ]] it is testing the string equality …
linux - What is the meaning of -n, -z, -x, -L, -d, etc... in Shell ...
WEBNov 16, 2018 · If any file argument to one of the primaries is of the form /dev/fd/n, then file descriptor n is checked. If the file argument to one of the primaries is one of /dev/stdin, …
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