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This is one of those things that can be difficult to search for if you don't already know where to look.
[ is actually a command, not part of the bash shell syntax as you might expect. It happens to be a Bash built-in command, so it's documented in the Bash manual.
There's also an external command that does the same thing; on many systems, it's provided by the GNU Coreutils package.
[ is equivalent to the test command, except that [ requires ] as its last argument, and test does not.
Assuming the bash documentation is installed on your system, if y...
Content Under CC-BY-SA license shell - What does "-ne" mean in bash? - Stack Overflow
Jul 17, 2013 · Following the reference to "Bash Conditional Expressions" will lead you to the description of -ne, which is the numeric inequality operator ("ne" stands for "not equal). By contrast, != is the string inequality operator.
Using the ‘-ne’ Operator in Bash: A Comprehensive Guide
Feb 28, 2024 · The ‘-ne’ operator is a relational operator in Bash scripting, used for comparing two numerical values. It stands for “not equal”, and it returns true if the values being compared are …
Linux Bash Not Equal “-ne” , “!=” Operators Tutorial
Jan 12, 2021 · Linux Bash scripting language provides the not equal “ -ne ” operator in order to compare two values if they are not equal. The not equal operator generally used with the if or elif statements to check not equal and …
- Question & Answer
Basic Operators in Shell Scripting - GeeksforGeeks
- Arithmetic Operators: These operators are used to perform normal …
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- Logical Operators : They are also known as boolean operators. These are …
- Bitwise Operators: A bitwise operator is an operator used to perform bitwise …
- File Test Operator: These operators are used to test a particular property of a …
bash - Shell equality operators (=, ==, -eq) - Stack Overflow
-eq is in the same family as -lt, -le, -gt, -ge, and -ne == is specific to bash (not present in sh (Bourne shell), ...). Using POSIX = is preferred for compatibility.
Test Operators in Bash [Cheat Sheet] - Linux Handbook
Oct 4, 2023 · 2. The -ne (not equal to) operator. The -ne operator does the opposite of the -eq by comparing two operators to check if they are not equal. For your reference, here's a similar …
The -ne Operator in Bash | Delft Stack
Jan 30, 2023 · The -ne Operator in Bash. If two potential values are not equal, the -ne operator is used in Bash programming to compare them. In Bash, the not equal function is represented by …
exit status - meaning of [ $? -ne '0' ]. (shell script) - Unix & Linux ...
Jan 6, 2022 · $? is the exit status (a string, but a representation of an integer) of the last command the shell waited for, that is, not put into the background with an & marker. A zero …
15 Special Characters You Need to Know for Bash - How-To Geek
Oct 11, 2023 · If you want to master the Bash shell on Linux, macOS, or another UNIX-like system, special characters (like ~, *, |, and >) are critical. We'll help you unravel these cryptic Linux command sequences and become a hero of hieroglyphics.
linux - How do I use the -ne flag for echo in a shell script ...
The problem is that your shell recognizes different escape codes than your /bin/sh. /bin/sh probably doesn't recognize \e as the escape character. Try \033 instead. You can also replace …
Conditional Expressions in Shell Script | Baeldung on Linux
Jun 8, 2023 · In this tutorial, we’ll discuss conditional expressions, and we’ll construct some examples to clarify the use of these expressions. 2. Conditional Expressions with && and ||. …
shell - How to write an if statement with multiple conditions - Unix ...
Feb 26, 2018 · -ne is for numeric (integer) comparisons. != is for string comparisons. With -ne, you should be getting an error message like bash: [: even: integer expression expected.
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There are seven arithmetic operators: Addition (+): Binary operation used to add two operands. Subtraction (-): Binary operation used to subtract two operands. Multiplication (*): Binary …
Bash Operator - LinuxSimply
Jan 23, 2024 · What is a Bash Operator? In Bash scripting, an operator is a special symbol or keyword used to perform specific operations on data or variables. These operators enable you …
Unix / Linux - Shell Basic Operators - Online Tutorials Library
· Unix / Linux - Shell Basic Operators. Previous. Next. There are various operators supported by each shell. We will discuss in detail about Bourne shell (default shell) …Up to8.4%
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Bash Special Variables ($0, $?, $#, $@, $$, $*) – TecAdmin
Mar 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 script being …
linux - What is the meaning of $? in a shell script? - Unix & Linux ...
$ followed by numbers (e.g. $1, $2, etc.) represents the parameters in the shell script.
What does $# mean in bash? - Ask Ubuntu
Jul 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 parameters are …
if [ $? -ne 0 ] then syntax error then unexpected - Stack Overflow
Jan 7, 2014 · I have been trying to execute the following UNIX shell script which is not working. I am running it by KornShell (ksh). echo $?; if [ $? -ne 0 ] then failed $LINENO-2 $5 $6 fi …
What does $# mean in shell? - Unix & Linux Stack Exchange
3 Answers. Sorted by: 41. You can always check the man page of your shell. man bash says: Special Parameters. # Expands to the number of positional parameters in decimal. Therefore …
Shell seeking 20% cut in oil and gas exploration workforce
1 day ago · The Nelson platform in the North Sea. Shell (LON: SHEL) could cut its oil and gas exploration workforce by 20%, a new Reuters report has warned. Citing company sources, the …
Pennsylvania ammo plant boosts production of key artillery shell …
3 days ago · A Pennsylvania ammunition plant that makes a key artillery shell in Ukraine’s fight against Russia has managed to boost production by 50% to meet surging demand, with more …
linux - What is the meaning of -n, -z, -x, -L, -d, etc... in Shell ...
Nov 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, …
A measure to repeal a private school tuition funding law in …
15 hours ago · FILE - Organizers load boxes of signed petitions seeking to get a measure on the November ballot that would repeal a new Nebraska law providing taxpayer money for private …