Bash script to verify if a process is running is not working












5















I have a simple script as below which checks if fail2ban service is running or not on Ubuntu 18.04:



#!/bin/bash



# Script to check if fail2ban service is running



if pgrep -x "fail2ban" > /dev/null

then

   echo "Fail2ban is running"

else

   echo "Fail2ban is not running"

fi


I have installed fail2ban in a test VM and is running on the VM. Here is a screenshot of systemctl status command.



But, when the run the above script, I get the result that "Fail2ban is not running". I am not sure if is with the script. I tried ps aux command too instead of pgrep. But, I still get the same result.






bash process administrator







share|improve this question









New contributor




skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 4





    Why even try to cobble something together with ps, when you can use systemctl is-active fail2ban? FWIW your command probably fails because you specified an exact match (-x) but the process name is actually fail2ban.server

    – steeldriver
    14 hours ago













  • Ok. Thanks. It worked, I changed the command to the above command. But, is there any way you know why pgrep will not work? Also, Is systemctl command available by default in all redhat systems?

    – skr
    14 hours ago













  • Oh that is right. Thank you so much.

    – skr
    14 hours ago











  • @skr Re: "... Is ... in all redhat systems?": Redhat is off-topic on AskUbuntu.

    – PerlDuck
    13 hours ago











  • @steeldriver That's the service name, not the process name.

    – Lightness Races in Orbit
    12 hours ago
















5















I have a simple script as below which checks if fail2ban service is running or not on Ubuntu 18.04:



#!/bin/bash



# Script to check if fail2ban service is running



if pgrep -x "fail2ban" > /dev/null

then

   echo "Fail2ban is running"

else

   echo "Fail2ban is not running"

fi


I have installed fail2ban in a test VM and is running on the VM. Here is a screenshot of systemctl status command.



But, when the run the above script, I get the result that "Fail2ban is not running". I am not sure if is with the script. I tried ps aux command too instead of pgrep. But, I still get the same result.






bash process administrator







share|improve this question









New contributor




skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
















  • 4





    Why even try to cobble something together with ps, when you can use systemctl is-active fail2ban? FWIW your command probably fails because you specified an exact match (-x) but the process name is actually fail2ban.server

    – steeldriver
    14 hours ago













  • Ok. Thanks. It worked, I changed the command to the above command. But, is there any way you know why pgrep will not work? Also, Is systemctl command available by default in all redhat systems?

    – skr
    14 hours ago













  • Oh that is right. Thank you so much.

    – skr
    14 hours ago











  • @skr Re: "... Is ... in all redhat systems?": Redhat is off-topic on AskUbuntu.

    – PerlDuck
    13 hours ago











  • @steeldriver That's the service name, not the process name.

    – Lightness Races in Orbit
    12 hours ago














5












5








5


1






I have a simple script as below which checks if fail2ban service is running or not on Ubuntu 18.04:



#!/bin/bash



# Script to check if fail2ban service is running



if pgrep -x "fail2ban" > /dev/null

then

   echo "Fail2ban is running"

else

   echo "Fail2ban is not running"

fi


I have installed fail2ban in a test VM and is running on the VM. Here is a screenshot of systemctl status command.



But, when the run the above script, I get the result that "Fail2ban is not running". I am not sure if is with the script. I tried ps aux command too instead of pgrep. But, I still get the same result.






bash process administrator







share|improve this question









New contributor




skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












I have a simple script as below which checks if fail2ban service is running or not on Ubuntu 18.04:



#!/bin/bash



# Script to check if fail2ban service is running



if pgrep -x "fail2ban" > /dev/null

then

   echo "Fail2ban is running"

else

   echo "Fail2ban is not running"

fi


I have installed fail2ban in a test VM and is running on the VM. Here is a screenshot of systemctl status command.



But, when the run the above script, I get the result that "Fail2ban is not running". I am not sure if is with the script. I tried ps aux command too instead of pgrep. But, I still get the same result.






bash process administrator




bash process administrator






share|improve this question









New contributor




skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question









New contributor




skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question








edited 10 hours ago









Pablo Bianchi

2,4451530




2,4451530






New contributor




skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked 14 hours ago









skrskr

263




263




New contributor




skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






skr is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.








  • 4





    Why even try to cobble something together with ps, when you can use systemctl is-active fail2ban? FWIW your command probably fails because you specified an exact match (-x) but the process name is actually fail2ban.server

    – steeldriver
    14 hours ago













  • Ok. Thanks. It worked, I changed the command to the above command. But, is there any way you know why pgrep will not work? Also, Is systemctl command available by default in all redhat systems?

    – skr
    14 hours ago













  • Oh that is right. Thank you so much.

    – skr
    14 hours ago











  • @skr Re: "... Is ... in all redhat systems?": Redhat is off-topic on AskUbuntu.

    – PerlDuck
    13 hours ago











  • @steeldriver That's the service name, not the process name.

    – Lightness Races in Orbit
    12 hours ago














  • 4





    Why even try to cobble something together with ps, when you can use systemctl is-active fail2ban? FWIW your command probably fails because you specified an exact match (-x) but the process name is actually fail2ban.server

    – steeldriver
    14 hours ago













  • Ok. Thanks. It worked, I changed the command to the above command. But, is there any way you know why pgrep will not work? Also, Is systemctl command available by default in all redhat systems?

    – skr
    14 hours ago













  • Oh that is right. Thank you so much.

    – skr
    14 hours ago











  • @skr Re: "... Is ... in all redhat systems?": Redhat is off-topic on AskUbuntu.

    – PerlDuck
    13 hours ago











  • @steeldriver That's the service name, not the process name.

    – Lightness Races in Orbit
    12 hours ago








4




4





Why even try to cobble something together with ps, when you can use systemctl is-active fail2ban? FWIW your command probably fails because you specified an exact match (-x) but the process name is actually fail2ban.server

– steeldriver
14 hours ago







Why even try to cobble something together with ps, when you can use systemctl is-active fail2ban? FWIW your command probably fails because you specified an exact match (-x) but the process name is actually fail2ban.server

– steeldriver
14 hours ago















Ok. Thanks. It worked, I changed the command to the above command. But, is there any way you know why pgrep will not work? Also, Is systemctl command available by default in all redhat systems?

– skr
14 hours ago







Ok. Thanks. It worked, I changed the command to the above command. But, is there any way you know why pgrep will not work? Also, Is systemctl command available by default in all redhat systems?

– skr
14 hours ago















Oh that is right. Thank you so much.

– skr
14 hours ago





Oh that is right. Thank you so much.

– skr
14 hours ago













@skr Re: "... Is ... in all redhat systems?": Redhat is off-topic on AskUbuntu.

– PerlDuck
13 hours ago





@skr Re: "... Is ... in all redhat systems?": Redhat is off-topic on AskUbuntu.

– PerlDuck
13 hours ago













@steeldriver That's the service name, not the process name.

– Lightness Races in Orbit
12 hours ago





@steeldriver That's the service name, not the process name.

– Lightness Races in Orbit
12 hours ago










1 Answer
1






active

oldest

votes


















11














You asked pgrep to exactly (-x) search for a process called fail2ban
but the output of systemctl status shows it is called
/usr/bin/python3 instead.



To check whether a systemd unit is running use



systemctl is-active --quiet fail2ban


That is:



if systemctl is-active --quiet fail2ban; then

    echo "running"

else

    echo "not running"

fi





share|improve this answer



















  • 2





    Alternatively, one could use pgrep -f '*fail2ban*' to pattern-match or pgrep -f '/usr/bin/python3 /usr/bin/fail2ban-server' to match exactly what screenshots reveal

    – Sergiy Kolodyazhnyy
    10 hours ago






  • 1





    pgrep -f '*fail2ban*' could catch the pgrep command itself.

    – Dev
    10 hours ago











  • At least on my 16.04 system, in spite of it being a python script, the process name (as seen in /proc/<pid>/comm) is fail2ban-server so pgrep -x fail2ban-server does work - although I see no reason to use it when systemctl is-active is available

    – steeldriver
    7 hours ago











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1 Answer
1






active

oldest

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1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









11














You asked pgrep to exactly (-x) search for a process called fail2ban
but the output of systemctl status shows it is called
/usr/bin/python3 instead.



To check whether a systemd unit is running use



systemctl is-active --quiet fail2ban


That is:



if systemctl is-active --quiet fail2ban; then

    echo "running"

else

    echo "not running"

fi





share|improve this answer



















  • 2





    Alternatively, one could use pgrep -f '*fail2ban*' to pattern-match or pgrep -f '/usr/bin/python3 /usr/bin/fail2ban-server' to match exactly what screenshots reveal

    – Sergiy Kolodyazhnyy
    10 hours ago






  • 1





    pgrep -f '*fail2ban*' could catch the pgrep command itself.

    – Dev
    10 hours ago











  • At least on my 16.04 system, in spite of it being a python script, the process name (as seen in /proc/<pid>/comm) is fail2ban-server so pgrep -x fail2ban-server does work - although I see no reason to use it when systemctl is-active is available

    – steeldriver
    7 hours ago
















11














You asked pgrep to exactly (-x) search for a process called fail2ban
but the output of systemctl status shows it is called
/usr/bin/python3 instead.



To check whether a systemd unit is running use



systemctl is-active --quiet fail2ban


That is:



if systemctl is-active --quiet fail2ban; then

    echo "running"

else

    echo "not running"

fi





share|improve this answer



















  • 2





    Alternatively, one could use pgrep -f '*fail2ban*' to pattern-match or pgrep -f '/usr/bin/python3 /usr/bin/fail2ban-server' to match exactly what screenshots reveal

    – Sergiy Kolodyazhnyy
    10 hours ago






  • 1





    pgrep -f '*fail2ban*' could catch the pgrep command itself.

    – Dev
    10 hours ago











  • At least on my 16.04 system, in spite of it being a python script, the process name (as seen in /proc/<pid>/comm) is fail2ban-server so pgrep -x fail2ban-server does work - although I see no reason to use it when systemctl is-active is available

    – steeldriver
    7 hours ago














11












11








11







You asked pgrep to exactly (-x) search for a process called fail2ban
but the output of systemctl status shows it is called
/usr/bin/python3 instead.



To check whether a systemd unit is running use



systemctl is-active --quiet fail2ban


That is:



if systemctl is-active --quiet fail2ban; then

    echo "running"

else

    echo "not running"

fi





share|improve this answer













You asked pgrep to exactly (-x) search for a process called fail2ban
but the output of systemctl status shows it is called
/usr/bin/python3 instead.



To check whether a systemd unit is running use



systemctl is-active --quiet fail2ban


That is:



if systemctl is-active --quiet fail2ban; then

    echo "running"

else

    echo "not running"

fi






share|improve this answer












share|improve this answer



share|improve this answer










answered 14 hours ago









PerlDuckPerlDuck

5,85111333




5,85111333








  • 2





    Alternatively, one could use pgrep -f '*fail2ban*' to pattern-match or pgrep -f '/usr/bin/python3 /usr/bin/fail2ban-server' to match exactly what screenshots reveal

    – Sergiy Kolodyazhnyy
    10 hours ago






  • 1





    pgrep -f '*fail2ban*' could catch the pgrep command itself.

    – Dev
    10 hours ago











  • At least on my 16.04 system, in spite of it being a python script, the process name (as seen in /proc/<pid>/comm) is fail2ban-server so pgrep -x fail2ban-server does work - although I see no reason to use it when systemctl is-active is available

    – steeldriver
    7 hours ago














  • 2





    Alternatively, one could use pgrep -f '*fail2ban*' to pattern-match or pgrep -f '/usr/bin/python3 /usr/bin/fail2ban-server' to match exactly what screenshots reveal

    – Sergiy Kolodyazhnyy
    10 hours ago






  • 1





    pgrep -f '*fail2ban*' could catch the pgrep command itself.

    – Dev
    10 hours ago











  • At least on my 16.04 system, in spite of it being a python script, the process name (as seen in /proc/<pid>/comm) is fail2ban-server so pgrep -x fail2ban-server does work - although I see no reason to use it when systemctl is-active is available

    – steeldriver
    7 hours ago








2




2





Alternatively, one could use pgrep -f '*fail2ban*' to pattern-match or pgrep -f '/usr/bin/python3 /usr/bin/fail2ban-server' to match exactly what screenshots reveal

– Sergiy Kolodyazhnyy
10 hours ago





Alternatively, one could use pgrep -f '*fail2ban*' to pattern-match or pgrep -f '/usr/bin/python3 /usr/bin/fail2ban-server' to match exactly what screenshots reveal

– Sergiy Kolodyazhnyy
10 hours ago




1




1





pgrep -f '*fail2ban*' could catch the pgrep command itself.

– Dev
10 hours ago





pgrep -f '*fail2ban*' could catch the pgrep command itself.

– Dev
10 hours ago













At least on my 16.04 system, in spite of it being a python script, the process name (as seen in /proc/<pid>/comm) is fail2ban-server so pgrep -x fail2ban-server does work - although I see no reason to use it when systemctl is-active is available

– steeldriver
7 hours ago





At least on my 16.04 system, in spite of it being a python script, the process name (as seen in /proc/<pid>/comm) is fail2ban-server so pgrep -x fail2ban-server does work - although I see no reason to use it when systemctl is-active is available

– steeldriver
7 hours ago










skr is a new contributor. Be nice, and check out our Code of Conduct.










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