job-control Operators¶
job-control defines a numbers of standard shell-like operators.
Pipeline¶
| is the quintessential shell operator. It will identify any
other | symbols in this expression and (effectively) rewrite it
from, say, a ... | b ... | c ... to (| (a ...) (b ...) (c
...)) and then combine the arguments to | into a pipeline.
I/O Redirection¶
The set of Idio I/O redirection operators is more limited than, say, Bash’s partly because Idio doesn’t require such arbitrary expressions. Generally, file descriptors can be managed like regular programming languages.
Idio is looking to cover the convenient redirection of the standard input, output and error file descriptors when orchestrating commands.
However, the Idio I/O redirection operators go a little further and allow you to redirect to or from string and file (descriptor) handles.
They are also handling this with respect to the general context of current input output and error handles.
The broad thrust of Idio I/O redirection is cmd args
op src/dst.
In particular note that the I/O operator operates on the cmd
args to its left. You cannot do I/O redirection “in advance” of the
command you are operating on.
Basic Redirection¶
That is the < > >> 2> 2>> operators.
Here, the src/dst of op can be:
a file descriptor or string handle in which case it used directly
a string in which case the named file is opened for input or output
#nwhich is a synonym for the string “/dev/null”
Duplication Redirection¶
That is the <& >& 2>& operators.
Here, the src/dst of op can be:
a file descriptor or string handle in which case it used directly
a C/int or fixnum to be used as a reference to the corresponding file descriptor
Only file descriptors 0, 1 and 2 are supported
Last built at 2024-12-21T07:10:40Z+0000 from 62cca4c (dev) for Idio 0.3.b.6