---
name: "recordio"
section: "1"
platform: "linux"
package: "ucspi-tcp"
version: "1:0.88-13"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/recordio"
---

# recordio(1)

records the input and output of a program.

## NAME

recordio - records the input and output of a program.

## SYNOPSIS

**recordio** *prog*

## DESCRIPTION

**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 \> \[EOF\]

or

     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.

## SEE ALSO

[tcpserver(1)](/tcpserver/1.md), [tcprules(1)](/tcprules/1.md), [tcprulescheck(1)](/tcprulescheck/1.md), [argv0(1)](/argv0/1.md), [fixcrio(1)](/fixcrio/1.md), [rblsmtpd(1)](/rblsmtpd/1.md), [tcpclient(1)](/tcpclient/1.md), who@(1), date@(1), finger@(1), http@(1), [tcpcat(1)](/tcpcat/1.md), [mconnect(1)](/mconnect/1.md), [tcp-environ(5)](/tcp-environ/5.md)

http://cr.yp.to/ucspi-tcp.html