Install Free Gold Price Widget!
Install Free Gold Price Widget!
Install Free Gold Price Widget!
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- Whats the difference between lt; lt;, lt; lt; lt; and lt; lt; in bash?
In bash these are implemented via temp files, usually in the form tmp sh-thd <random string>, while in dash they are implemented as anonymous pipes This can be observed via tracing system calls with strace command Replace bash with sh to see how bin sh performs this redirection $ strace -e open,dup2,pipe,write -f bash -c 'cat <<EOF > test
- bash - What does lt; lt; lt; mean? - Unix Linux Stack Exchange
Take a look at the Bash man page This notation is part of what's called a here documents here strings It allows you the ability to generate multi-line data input as one continuous string The variation you're asking about is called a here string excerpt from Bash man page
- bash - Precedence of the shell logical operators , || - Unix Linux . . .
This is not the case with Bash, however, in which both operators have the same precedence, which is why Bash parses your expression using the left-associativity rule Thanks to Kevin's comment for bringing this up There might also be cases where all 3 expressions are evaluated
- bash - Confusing use of and - Unix Linux Stack Exchange
Bash Operators for scripting 0 Using numbers with decimal points in if statements and operators Hot
- What is the meaning of read -r? - Unix Linux Stack Exchange
The Bash man page's section about read states that, by default The backslash character (\) may be used to remove any special meaning for the next character read and for line continuation but, if you pass -r, then Backslash does not act as an escape character The backslash is considered to be part of the line
- What does -s and [ []] mean in an if condition in bash?
The -s test returns true if [ ] if file exists and has a size greater than zero This is documented in the bash manual, and also in the manual for the test utility (the test may also be written if test -s file; then)
- What does the -e do in a bash shebang? - Unix Linux Stack Exchange
All the bash command line switches are documented in man bash -e Exit immediately if a pipeline (which may consist of a single simple command), a subshell command enclosed in parentheses, or one of the commands executed as part of a command list enclosed by braces (see SHELL GRAMMAR above) exits with a non-zero status
- bash - Whats the difference between $@ and - Unix Linux Stack Exchange
cat foo sh #! bin bash echo The parameters passed in are $@ echo The parameters passed in are $* foo sh herp derp The parameters passed in are herp derp The parameters passed in are herp derp Is one preferred over the other? Why are there 2 builtin variables to do the exact same thing?
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