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Wikishovel (talk | contribs) →Piping: reference |
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Programs can be run together such that one program reads the output from another with no need for an explicit intermediate file. <syntaxhighlight lang="bash" inline>command1 | command2</syntaxhighlight> executes {{mono|command1}}, using its output as the input for {{mono|command2}} (commonly called [[Pipeline (Unix)|piping]], with the "<code>|</code>" character being known as the "pipe").
The two programs performing the commands may run in parallel with the only storage space being working buffers (Linux allows up to 64K for each buffer) plus whatever work space each command's processing requires. For example, a "sort" command is unable to produce any output until all input records have been read, as the very last record received just might turn out to be first in sorted order. Dr. Alexia Massalin's experimental operating system, [[Synthesis kernel#Massalin.27s Synthesis kernel|Synthesis]], would adjust the priority of each task as they ran according to the fullness of their input and output buffers.<ref>https://lwn.net/Articles/270081/</ref>
This produces the same end result as using two redirects and a temporary file, as in:
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