[TUHS] The UNIX Command Language (1976)

[Niklas Karlsson]

< file grep foo works.

Niklas

Den fre 4 dec. 2020 kl 14:16 skrev Tyler Adams <coppero1237 at gmail.com>:

> I find cat file | grep foo simpler because it reads Left to Right.
>
>  Tyler
>
>
> On Fri, Dec 4, 2020 at 1:34 PM Andy Kosela <akosela at andykosela.com> wrote:
>
>> On 12/4/20, arnold at skeeve.com <arnold at skeeve.com> wrote:
>> > Dan Cross <crossd at gmail.com> wrote:
>> >
>> >> This has always struck me as particularly elegant in scripts. Consider:
>> >>
>> >>     cat "$@" | whatever
>> >>
>> >> (Or you may prefer `cat $* | whatever`)
>> >>
>> >> Now one's script can take any number of file arguments or stdin, even
>> if
>> >> the filter does not.
>> >
>> > I think Dan has hit the heart of the matter. People are used to using
>> > cat for multiple files to start pumping data down a pipeline, so they
>> > continue to do so even when there's only one file.
>> >
>>
>> The classic example is:
>>
>>   $ cat file | grep foo
>>
>> instead of the simpler:
>>
>>   $ grep foo file
>>
>> It appears cat(1) and pipe(7) are deeply ingrained in people's brains.
>>
>> --Andy
>>
>
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