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diff --git a/doc_src/psub.txt b/doc_src/psub.txt new file mode 100644 index 00000000..d69c16fb --- /dev/null +++ b/doc_src/psub.txt @@ -0,0 +1,21 @@ + +\section psub psub - Perform process substitution + +\subsection psub-synopsis Synopsis + <tt>COMMAND1 (COMMAND2|psub) </tt> + +\subsection psub-description Description + +Posix shells feature a syntax that is a mix between command +substitution and piping, called process substitution. It is used to +send the output of a command into the calling command, much like +command substitution, but with the difference that the output is not +sent through commandline arguments but through a named pipe, with the +filename of the named pipe sent as an argument to the calling +program. The psub shellscript function, which when combined with a +regular command substitution provides the same functionality. + +\subsection psub-example Example + +<tt>diff (sort a.txt|psub) (sort b.txt|psub)</tt> shows the difference +between the sorted versions of files a.txt and b.txt. |