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syntax:expansion:intro [2011/02/11 05:14] thebonsai [Overview] |
syntax:expansion:intro [2017/03/05 18:09] (current) fgrose [Expansions and substitutions] punctuation |
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| echo "$mystring" | echo "$mystring" | ||
| </code> | </code> | ||
| - | The ''echo'' program definitely doesn't care about what a shell variable is. It is Bash's job to deal with the variable. Bash **expands** the string "''$myvar''" to "''Hello world''", so that ''echo'' will only see ''Hello world'', not the variable or anything else! | + | The ''echo'' program definitely doesn't care about what a shell variable is. It is Bash's job to deal with the variable. Bash **expands** the string "''$mystring''" to "''Hello world''", so that ''echo'' will only see ''Hello world'', not the variable or anything else! |
| - | After all these expansions and substitutions are done, all quotes that are not meant literally (i.e. [[syntax:quoting | the quotes that marked contiguous words]], as part of the shell syntax) are removed from the commandline text, so the called program won't see them. This step is called **quote-removal**. | + | After all these expansions and substitutions are done, all quotes that are not meant literally (i.e., [[syntax:quoting | the quotes that marked contiguous words]], as part of the shell syntax) are removed from the commandline text, so the called program won't see them. This step is called **quote-removal**. |
| ===== Overview ===== | ===== Overview ===== | ||