Date: Sat, 6 Jan 2018 17:03:52 +0100 From: Polytropon <freebsd@edvax.de> To: Victor Sudakov <vas@mpeks.tomsk.su> Cc: Ultima <ultima1252@gmail.com>, Polytropon <freebsd@edvax.de>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: Convert .flac and .ape to mp3 Message-ID: <20180106170352.ce49b320.freebsd@edvax.de> In-Reply-To: <20180106150753.GA35605@admin.sibptus.transneft.ru> References: <20180104163421.GA15692@admin.sibptus.transneft.ru> <20180104175156.440fa0c2.freebsd@edvax.de> <20180106063934.GA32231@admin.sibptus.transneft.ru> <CANJ8om7LJqAG%2BX0dn1JDZn1WYJtxZtX9SAK2yQU74om7-SSQRQ@mail.gmail.com> <20180106085528.GA33117@admin.sibptus.transneft.ru> <CANJ8om7zUoLM9HCB_5rzC9uWRaPRhCNKcS4-WsXyjZOGGKwDig@mail.gmail.com> <CANJ8om4W7JTxSYxrLjxkDjDVE8b6CxBcOwPV%2BPMQ-oQJYuNW9g@mail.gmail.com> <20180106150753.GA35605@admin.sibptus.transneft.ru>
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On Sat, 6 Jan 2018 22:07:53 +0700, Victor Sudakov wrote: > Ultima wrote: > > Actually, that wont work either. I decided to go look at some of my scripts > > where I had to do something similar, the solution was setting IFS. > > > > IFS=$'\n' > > What's the dollar sign here for? Why not IFS='\n'? It can be seen as "evaluation symbol" (as known from $FOO being "FOO evaluated"), or "value of" ($FOO = the value of FOO). Another way (convenient, but doesn't look good" is to do something like this: IFS=" " This is a newline as well. In the case above, you want to set IFS to an _actual_ newline, not to \n. Remember _when_ the shell evaluates something: Variables like $IFS will be evaluated when being accessed, not when they are being declared (even with an initial value). The $'\n' makes sure that IFS will be assigned an actual (non-escaped) newline, so when constructs like for() or while read access $IFS, they find a "real" newline there. With the same idea in mind, you sometimes find things like this: IFS="`printf '\n'`" I think it becomes perfectly clear now: IFS is assigned the _result_ of _printing_ a \n. At least that's how my dusty brain seems to remember... ;-) -- Polytropon Magdeburg, Germany Happy FreeBSD user since 4.0 Andra moi ennepe, Mousa, ...
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