How to remove system redirect message from screen

Question

I am getting dhcp server status using service dhcpd status. Result is

Redirecting to /bin/systemctl status dhcpd.service ● dhcpd.service - DHCPv4 Server Daemon Loaded: loaded (/usr/lib/systemd/system/dhcpd.service; enabled; vendor preset: disabled)

Active: active (running) since......

I just want to extract active and send to php (Zend) server. To do it, I used

service dhcpd status | awk '{for (I=1;I<=NF;I++) if ($I == "Active:") {print $(I+1)};}'

Result is

Redirecting to /bin/systemctl status dhcpd.service

active

I just don't understand how to remove Redirecting to /bin/systemctl status dhcpd.service part from the result.

I have tried these answers, but they were not addressing my issue.

Am I missing something? or is there a better way to do it? I am not familiar with shell scripts.

Thanks in advance.

I suggest to replace `service dhcpd status` by `service dhcpd status 2>&1`. — Cyrus, Jul 07 '17 at 05:37
Instead of `service dhcpd status | awk ...` you should use: `service dhcpd status |& awk ...` — anubhava, Jul 07 '17 at 05:39
@Cyrus No, it doesn't give me the result I want. I just want to take `active` and also remove this "Redirecting to /bin/systemctl status dhcpd.service" — Sachith Muhandiram, Jul 07 '17 at 05:40
@anubhava Yes, worked. Please post it as an answer to accept. Thanks a lot. — Sachith Muhandiram, Jul 07 '17 at 05:41

Inian · Accepted Answer · 2017-07-07T05:51:16.453

3

Just use Awk looking for the Active: string and print the status

service dhcpd status 2>&1 | awk '$1=="Active:"{print $2}'

The part $1="Active:" looks up the line whose first column value is Active: and print the next column value which is the status you are looking for.

As suggested above, redirect the stderr, the standard error stream to stdout and apply Awk on it to filter the error message.

As suggested by anubhava in comments you could use |& in recent versions of bash to redirect stderr to stdout as

service dhcpd status |& awk '$1=="Active:"{print $2}'

edited Jul 07 '17 at 05:51

answered Jul 07 '17 at 05:35

Inian

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Yes, I just want to remove printing "Redirecting to /bin/systemctl status dhcpd.service" in terminal – Sachith Muhandiram Jul 07 '17 at 05:38
@Sachith: Refer my update above – Inian Jul 07 '17 at 05:40
1

oh sorry I didn't see see your updated answer. Deleted mine and upvoted your's – anubhava Jul 07 '17 at 05:50
2

original credit goes to you btw @anubhava ;) – Inian Jul 07 '17 at 05:50
1

@anubhava was the first to give the correct answer for my problem. – Sachith Muhandiram Jul 07 '17 at 08:46

How to remove system redirect message from screen

1 Answers1