What is the significance of square brackets around a process when looking at a listing produced by the ps command?
Square brackets [] are used to indicate that the process’ /proc//cmdline was empty. Possible reasons for this are the process is a zombie or a kernel thread.
What do square brackets do in bash?
3 Answers. The square brackets are a synonym for the test command. An if statement checks the exit status of a command in order to decide which branch to take. grep -q “$text” is a command, but “$name” = ‘Bob’ is not–it’s just an expression.
What do square brackets do in Linux?
The square brackets ( [ ] ) indicate that the enclosed element (parameter, value, or information) is optional. You can choose one or more items or no items. Do not type the square brackets themselves in the command line.
What do brackets mean bash?
The first usage for single parenthesis is running commands inside in a subshell. This means that they run through all of the commands inside, and then return a single exit code. Any variables declared or environment changes will get cleaned up and disappeared.
When to use square brackets and round brackets?
Round brackets (parentheses) are used to add afterthoughts or explainers. Square brackets are used to make quotations clearer or shorter. With round brackets, the period goes inside the closed bracket if the bracketed text is a sentence in its own right. This page has examples of round and square brackets and an interactive exercise.
What is the purpose of using square brackets in JSON?
The square brackets produce a list/array. The curly brackets produce an object with key/value pairs. The list can then be a value of a key/value pair. [] means an array of object (a list) and {} means it will be an object.
How to use square brackets in academic writing?
1 Use square brackets to include words within a quote that are not part of the original quote. 2 Enclose “sic” (loosely meaning, “as written”) in square brackets to indicate that the quote is exactly as is in the original, even if there are spelling or other syntax errors 3 Usually, enclose an ellipsis in brackets.
How to use square brackets to make text clearer?
Square Brackets to Make the Text Clearer 1 Hedy Lamarr once said: “Most people save all their lives and leave it [their money] to somebody else.” 2 “It [electricity] is really just organized lightning.” More