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I run

nohup bash -c "while [ true ]; do echo test; done"

from PuTTy SSH client, but after this process is not running in background instead nohup keeps to be foreground process in shell.

SW version: nohup (GNU coreutils) 8.5

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up vote 4 down vote accepted
nohup bash -c "while [ true ]; do echo test; done" &

Nohup provides you immunity to hangup signals. But it does not automatically set the process to background.

It's the & at the end of the command that causes it to run in the background.

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Thanks for the precision @Randy Orrison – M'vy Apr 12 '11 at 8:01

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