Add more information and examples on podman and pipes

Improve the documentation to help users to know proper way to
use podman within a pipe.

Helps Prevent: https://github.com/containers/podman/issues/8916

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/docs/source/markdown/podman-run.1.md b/docs/source/markdown/podman-run.1.md
index 674079a9d..74c231184 100644
--- a/docs/source/markdown/podman-run.1.md
+++ b/docs/source/markdown/podman-run.1.md
@@ -1011,8 +1011,11 @@ When set to **true**, Podman will allocate a pseudo-tty and attach to the standa
 input of the container. This can be used, for example, to run a throwaway
 interactive shell. The default is **false**.
 
-**NOTE**: The **-t** option is incompatible with a redirection of the Podman client
-standard input.
+**NOTE**: The --tty flag prevents redirection of standard output.  It combines STDOUT and STDERR, it can insert control characters, and it can hang pipes. This option should only be used when run interactively in a terminal. When feeding input to Podman, use -i only, not -it.
+
+```
+echo "asdf" | podman run --rm -i someimage /bin/cat
+```
 
 #### **--tz**=*timezone*
 
@@ -1528,6 +1531,13 @@ weight by **--blkio-weight-device** flag. Use the following command:
 $ podman run -it --blkio-weight-device "/dev/sda:200" ubuntu
 ```
 
+### Using a podman container with input from a pipe
+
+```
+$ echo "asdf" | podman run --rm -i --entrypoint /bin/cat someimage
+asdf
+```
+
 ### Setting Namespaced Kernel Parameters (Sysctls)
 
 The **--sysctl** sets namespaced kernel parameters (sysctls) in the