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Diffstat (limited to 'doc_src/psub.txt')
-rw-r--r-- | doc_src/psub.txt | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/doc_src/psub.txt b/doc_src/psub.txt index be812f4a..12f1b620 100644 --- a/doc_src/psub.txt +++ b/doc_src/psub.txt @@ -7,20 +7,10 @@ COMMAND1 (COMMAND2 | psub [-f]) \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. `psub` combined with a -regular command substitution provides the same functionality. +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. `psub` combined with a regular command substitution provides the same functionality. + +If the `-f` or `--file` switch is given to `psub`, `psub` will use a regular file instead of a named pipe to communicate with the calling process. This will cause `psub` to be significantly slower when large amounts of data are involved, but has the advantage that the reading process can seek in the stream. -If the `-f` or `--file` switch is given to `psub`, `psub` will use a -regular file instead of a named pipe to communicate with the calling -process. This will cause `psub` to be significantly slower when large -amounts of data are involved, but has the advantage that the reading -process can seek in the stream. \subsection psub-example Example |