setsid
TLDR
Run a program in a new session
$ setsid [program]
Run a program in a new session discarding output and errors$ setsid [program] > /dev/null 2>&1
Run a program creating a new process (fork)$ setsid -f [program]
Return the exit code of the program as setsid's exit code$ setsid -w [program]
Run a program with the current terminal as the controlling terminal$ setsid -c [program]
SYNOPSIS
setsid [options] program [arguments]
DESCRIPTION
setsid runs a program in a new session. A session is a collection of process groups, and a new session has no controlling terminal by default. The calling process becomes the session leader.
This is commonly used to detach programs from the terminal, run daemons, or ensure a process continues running after logout. When combined with output redirection, it effectively backgrounds a process independently.
PARAMETERS
-c, --ctty
Set the controlling terminal to the current one-f, --fork
Always fork, creating a new process-w, --wait
Wait for the program to exit and return its exit status-h, --help
Display help information-V, --version
Display version information
CAVEATS
If the calling process is already a session leader, setsid will fail unless -f is used. The new session has no controlling terminal unless -c is specified. Part of the util-linux package.
