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recordio(1) General Commands Manual recordio(1)


recordio - records the input and output of a program.


recordio prog


recordio runs prog. It prints lines to descriptor 2 showing the input and output of prog.

At the beginning of each line on descriptor 2, recordio inserts the prog process ID, along with < for input or > for output. At the end of each line it inserts +, a space, or [EOF]; a space indicates that there was a new line in the input or output, and [EOF] indicates the end of input or output.

recordio prints every packet of input and output immediately. It does not attempt to combine packets into coherent lines. For example,

recordio sh -c 'cat /dev/fd/8 2>&1' > /dev/null

could produce

5135 > cat: /dev/fd/8: Bad file descriptor
5135 > [EOF]


5135 > cat: +
5135 > /dev/fd/8+
5135 > : +
5135 > Bad file descriptor
5135 > [EOF]

if the cat program prints several packets.

recordio uses several lines for long packets to guarantee that each line is printed atomically.

recordio runs as a child process of prog. It exits when it sees the end of prog's output.


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