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- obsolete
- ld never use them. None of the items on this list are specified by the most current version of POSIX, a... rtain details like whether a newline or semicolon are required vary. Only ''for'' works in Bash. Needle... aging bad practices or dangerous code. Those that are specified by POSIX may be badly designed and unch... n, [[commands:builtin:read]] |//Quoting errors// are a broad category of common mistakes brought about
- quoting
- oublequotes single double}} Quoting and escaping are important, as they influence the way Bash acts upon your input. There are three recognized types: * **per-character escap... n results.** Besides these basic variants, there are some special quoting methods (like interpreting A... e quote and ''<nowiki>'</nowiki>'', single quote) are a syntax element that influence parsing. It is no
- positional-parameters
- o give arguments to your scripts. These arguments are known as **positional parameters**. Some relevant special parameters are described below: ^Parameter(s)^Description^ |''$0... ents. => forget that one ==== Loops ==== There are several ways to loop through the positional param... ional parameters from ''$1'' to the last one used are expanded without any special handling. When the
- redirection
- kes the shell powerful. The redirection operators are checked whenever a [[syntax:grammar:parser_exec |... be executed]]. Under normal circumstances, there are 3 files open, accessible by the file descriptors ... l is ;-) </wrap> Both, ''stdout'' and ''stderr'' are output file descriptors. Their difference is the ... anywhere** in a simple command, so these examples are equivalent: <code> cat foo.txt bar.txt >new.txt c