Re: '>;' redirection operator [was: [1003.1(2008)/Issue 7 0000530]: Support in-place editing in sed (-iEXTENSION)]
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On 12/22/11 13:03, Eric Blake wrote:
I assume on the ksh implementation that the temp file is discarded if the command (simple or compound) feeding the redirection failed?
One would hope!
If the redirection is used on a simple command, is there any shorthand for specifying that the destination name on success also be fed as an argument to the command, to avoid the redundancy of having to type 'file' both before and after the'>;' operator?
Doesn't the shell already have enough hieroglyphs? It is what intimidates many folks from figuring it out.
I assume that this is like any other redirection operator, where an optional fd number can be prepended, as in '2>; file' to collect stderr and overwrite file on success?
When the exact opposite is the useful variation? I.e. keep-on-failure. "-i" for sed is simple, understandable and implemented a lot. Please don't add another glyph to the standardized shell. Let us not slide on slippery slopes. Shells can always add some useful builtins: sh_move_if_changed sh_save_on_success sh_save_on_failure to cope with this stuff. Or you can write your own such library for your own use. ">;" is not an answer for sed-as-a-batch-editor anyway, which is what "-i" really is. -- To unsubscribe from this list: send the line "unsubscribe dash" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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