The nohup utility invokes the named command with the arguments supplied. When the command is invoked, nohup arranges for the SIGHUP signal to be ignored by the process.

The nohup utility does not arrange to make processes immune to a SIGTERM (terminate) signal, so unless they arrange to be immune to SIGTERM or the shell makes them immune to SIGTERM, they will receive it.

Add an ampersand and the contents of file are run in the background with interrupts also ignored (see sh(1)):

example$ nohup file &

nohup pnglog yahoo.com &
nohup pnglog bx2blm-atm1-0.montreal.canet.ca 120 &

documented on: 02-27-99