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- linux - What does $@ mean in a shell script? - Stack Overflow
What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@
- bash - What is the purpose of in a shell command? - Stack Overflow
$ command one command two the intent is to execute the command that follows the only if the first command is successful This is idiomatic of Posix shells, and not only found in Bash It intends to prevent the running of the second process if the first fails You may notice I've used the word "intent" - that's for good reason
- bash - What are the special dollar sign shell variables . . . - Stack . . .
In Bash, there appear to be several variables which hold special, consistently-meaning values For instance, myprogram amp;; echo $! will return the PID of the process which backgrounded myprog
- bash - Shell equality operators (=, ==, -eq) - Stack Overflow
It depends on the Test Construct around the operator Your options are double parentheses, double brackets, single brackets, or test If you use ((…)), you are testing arithmetic equality with == as in C: $ (( 1==1 )); echo $? 0 $ (( 1==2 )); echo $? 1 (Note: 0 means true in the Unix sense and a failed test results in a non-zero number ) Using -eq inside of double parentheses is a syntax
- How do AND and OR operators work in Bash? - Stack Overflow
8 In bash, and || have equal precendence and associate to the left See Section 3 2 3 in the manual for details So, your example is parsed as $ (echo this || echo that) echo other And thus only the left-hand side of the or runs, since that succeeds the right-hand side doesn't need to run
- bash - How to escape single quotes within single quoted strings - Stack . . .
bash: !\x22: event not found One more alternative: this allows mixed expansion and non-expansion all within the same bash string Here is another demo of an alternative escaping technique First, read the main answer by @liori to see how the 2nd form below works Now, read these two alternative ways of escaping characters
- command line - Where is . bashrc? - Ask Ubuntu
There is no bashrc in etc (there is a bash bashrc, however) Do I create a bashrc file in my user or home directory? Is there a better, more recent set of instructions for modifying the bash prompt?
- Linux command to print directory structure in the form of a tree
Is there any linux command that I can call from a Bash script that will print the directory structure in the form of a tree, e g , folder1 a txt b txt folder2 folder3
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