query: What is `:-` doing in `FOO=${BAR:-localhost}`?
positive_passages.docid: 77109
positive_passages.text: Usage of :- (colon dash) in bash
negative_passages.docid: 120043
negative_passages.text: What is the proper use of \@ (i.e., backslash-at)?
negative_passages.docid: 45816
negative_passages.text: What do $< and $@ represent in a Makefile?
negative_passages.docid: 107982
negative_passages.text: Difference between -%> and %> in rails
negative_passages.docid: 58290
negative_passages.text: Why can I not access a file named `-` when quoting?
negative_passages.docid: 51432
negative_passages.text: What does the "$#" special parameter mean in Bash?
negative_passages.docid: 89546
negative_passages.text: Where is the `--` (double dash) argument documented?
negative_passages.docid: 126423
negative_passages.text: ./ vs normal execution
negative_passages.docid: 24077
negative_passages.text: What the #$@&%*! is that called?
negative_passages.docid: 126498
negative_passages.text: What is the purpose of the : (colon) GNU Bash builtin?
negative_passages.docid: 79345
negative_passages.text: Why does "cat {foo}" not output foo, but "cat {foo,bar}" does?
negative_passages.docid: 38430
negative_passages.text: In PHP, what does the ${$ } syntax do?
negative_passages.docid: 120372
negative_passages.text: How to typeset $:=$ correctly?
negative_passages.docid: 148080
negative_passages.text: Brace expansion with a Bash variable - {0..$foo}
negative_passages.docid: 30206
negative_passages.text: Where and how is the _ (underscore) variable specified?
negative_passages.docid: 94797
negative_passages.text: Is the single underscore "_" a built-in variable in Python?
negative_passages.docid: 13818
negative_passages.text: What is the difference between /opt and /usr/local?