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- obsolete
- ortability issues. This first table lists syntax that is tolerated by Bash but has few if any legitimat... s to say, don't use it.| This table lists syntax that is specified by POSIX (unless otherwise specified... ncouraging bad practices or dangerous code. Those that are specified by POSIX may be badly designed and ... by default, unless they are quoted.** This means that the act of expanding an unquoted variable in an o
- quoting
- >'</nowiki>'', single quote) are a syntax element that influence parsing. It is not related to the quote... nsions and substitutions. In general, a character that has a special meaning to Bash, like the dollar-si... a stream from stdin and escape characters in text that could be interpreted as # special characters by s... The backslash can be used to mask every character that has a special meaning to bash. __Exception:__ Ins
- redirection
- input of a command comes from. It's a mighty tool that, together with pipelines, makes the shell powerfu... scriptors. Their difference is the **convention** that a program outputs payload on ''stdout'' and diagn... ror-messages on ''stderr''. If you write a script that outputs error messages, please make sure you foll... e to use operands (e.g. filenames to redirect to) that contain spaces you **must** quote them!</wrap> =
- positional-parameters
- n easily influence it (the ''login'' program does that for login shells, by prefixing a dash, for exampl... value - which is a bad idea if you write a script that takes many filenames as arguments. => forget that one ==== Loops ==== There are several ways to loop... s to another program. It's very inefficient to do that in one of these loops, as you will destroy integr