When executing a bash shell script in ubuntu 18.04, the location parameter doesn't work, how can I solve this problem?

Andrew

11/12/22, 7:44 AM

The name of the script is InstallmDNS.sh

The script content is as follows:

#!/bin/bash

sethostname() {
  if [ $# -eq 1 ]
  then
    hostnamectl set-hostname "$1"
    sed -i "/127.0.1.1/d" /etc/hosts
    sed -i "/127.0.0.1/a\127.0.1.1    $1" /etc/hosts
    reboot
  else
    echo "The exapmle of execute the script:  bash InstallmDNS.sh server1"
    echo "This script is executed with one parameter."
    exit 0
  fi
}

dia=`systemctl status avahi-daemon|grep Active`
if [[ "$dia" =~ "running" ]]
then
  echo "mDNS is running"
  sethostname
else
  apt-get install avahi-daemon -y
  echo "mDNS installation complete."
  sethostname
fi

I run the script:

root@linux:/home/ankon# bash InstallmDNS.sh
mDNS is running
The exapmle of execute the script:  bash InstallmDNS.sh server1
This script is executed with one parameter.

I run the script with parameters:

root@linux:/home/ankon# bash InstallmDNS.sh server2
mDNS is running
The exapmle of execute the script:  bash InstallmDNS.sh server1
This script is executed with one parameter.

I added the parameters and ran the script, but the parameters didn't do anything, what caused this? How can I fix it?

1 + 0

scripts

Score:4

Ubuntu

Dmitriy Vinokurov

11/12/22, 7:57 AM

$# in your function contains count of arguments passed to function, not to whole script. You could execute sethostname "$@" to pass all script arguments to function, then arguments count will work as you've expected.

0 + 2

Andrew

11/12/22, 8:02 AM

Thanks very much!

Dmitriy Vinokurov

11/12/22, 9:21 AM

You are welcome :) If it works for you - please mark answer as accepted to let other people see that it solves issue.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: When executing a bash shell script in ubuntu 18.04, the location parameter doesn't work, how can I solve this problem?

TH: เมื่อเรียกใช้สคริปต์ bash shell ใน Ubuntu 18.04 พารามิเตอร์ตำแหน่งไม่ทำงาน ฉันจะแก้ปัญหานี้ได้อย่างไร

RO: Când execut un script shell bash în ubuntu 18.04, parametrul de locație nu funcționează, cum pot rezolva această problemă?

RU: При выполнении сценария оболочки bash в Ubuntu 18.04 параметр местоположения не работает, как я могу решить эту проблему?

VI: Khi thực thi tập lệnh bash shell trong Ubuntu 18.04, tham số vị trí không hoạt động, tôi có thể giải quyết vấn đề này như thế nào?

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