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I'm writing a script to automatically install a bind server on a CentOs 7 distribution.
I'm stuck with systemctl status, because it does not produce an error code (it's right, since a status is not an error) I can use.
What I want is to check whether the service is started (active). What is the best and efficient way to do this?
325
To check a service's status, use the systemctl status service-name command. I like systemd's status because of the detail given. For example, in the above listing, you see the full path to the unit file, the status, the start command, and the latest status changes.
Bash commands to check running process: pgrep command – Looks through the currently running bash processes on Linux and lists the process IDs (PID) on screen. pidof command – Find the process ID of a running program on Linux or Unix-like system.
On Unix-like operating systems, test is a builtin command of the Bash shell that tests file attributes, and perform string and arithmetic comparisons.
The best way to check if a service is active is with the systemctl is-active command:
# systemctl start sshd
# systemctl is-active sshd >/dev/null 2>&1 && echo YES || echo NO
YES
# systemctl stop sshd
# systemctl is-active sshd >/dev/null 2>&1 && echo YES || echo NO
NO
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