Enable autostart
(→Hostname update) |
|||
| (One intermediate revision by one user not shown) | |||
| Line 41: | Line 41: | ||
A script updates the Raspberry Pi hostname, with the name in ''~/svn/log/robotname''. | A script updates the Raspberry Pi hostname, with the name in ''~/svn/log/robotname''. | ||
The script ''rename_host.bash'' is: | The script ''rename_host.bash'' is: | ||
| + | |||
#!/bin/bash | #!/bin/bash | ||
hn=`hostname` | hn=`hostname` | ||
f="/home/local/svn/log/robotname" | f="/home/local/svn/log/robotname" | ||
if [ -f $f ]; | if [ -f $f ]; | ||
| − | then | + | then # file exist |
| + | # get (new) name in file to variable nn | ||
nn=`cat $f` | nn=`cat $f` | ||
| − | yy= $(expr length $nn) | + | echo "found name " $nn |
| + | yy=$(expr length $nn) | ||
if [ $yy -gt 2 ]; | if [ $yy -gt 2 ]; | ||
| − | then | + | then # length is longer than 2 characters |
if [ $hn != $nn ]; | if [ $hn != $nn ]; | ||
| − | then | + | then # replace old hostname with new |
| + | echo ++++++++++ >> rebootinfo.txt | ||
| + | date >> rebootinfo.txt | ||
| + | echo new name is $nn, so rename host from $hn >> rebootinfo.txt | ||
hostnamectl set-hostname $nn | hostnamectl set-hostname $nn | ||
| − | |||
sed -i "s/$hn/$nn/g" /etc/hosts | sed -i "s/$hn/$nn/g" /etc/hosts | ||
| − | |||
| − | |||
fi | fi | ||
fi | fi | ||
| Line 63: | Line 66: | ||
fi | fi | ||
| − | The script needs to be run as root | + | The script needs to be run as root; it is, therefore set to run as part of the boot process. |
Create the script in /etc/init.d | Create the script in /etc/init.d | ||
| Line 69: | Line 72: | ||
sudo nano /etc/init.d/host_rename.sh | sudo nano /etc/init.d/host_rename.sh | ||
| − | Enter the following lines into the new file | + | Enter the following lines into the new file. |
#!/bin/bash | #!/bin/bash | ||
| Line 80: | Line 83: | ||
The script is then executed when the Raspberry boots, and if the hostname does not match that of the Teensy, then the hostname is modified. | The script is then executed when the Raspberry boots, and if the hostname does not match that of the Teensy, then the hostname is modified. | ||
| + | |||
| + | The script makes a note in the file '/home/local/svn/robobot/setup/rebootinfo.txt (owned by 'root') if the name is changed. | ||
Latest revision as of 10:23, 22 December 2023
Back to Robobot B
[edit] Autostart
Start app to display IP on Regbot display, log CPU temperature and synchronize hostname
Make an on-reboot script in the home directory
cp ~/svn/robobot/setup/on_reboot.bash ~/
This file is something like:
#!/bin/bash # script to start applications after a reboot # # run the app to show IP of raspberry on the Teensy display. mkdir -p /home/local/svn/log cd /home/local/svn/log # save the last reboot date echo "Rebooted" >> /home/local/rebootinfo.txt date >> /home/local/rebootinfo.txt # start IP display (and button start) task ../robobot/ip_disp/build/ip_disp & # save PID for IP display task for debugging echo "ip_disp started with PID:" >> /home/local/rebootinfo.txt pgrep -l ip_disp >> /home/local/rebootinfo.txt exit 0
Use crontab to run this script at reboot
crontab -e
If asked, select the preferred editor (suggesting nano).
Add this line at the end:
@reboot /home/local/on_reboot.bash
[edit] Hostname update
A script updates the Raspberry Pi hostname, with the name in ~/svn/log/robotname. The script rename_host.bash is:
#!/bin/bash
hn=`hostname`
f="/home/local/svn/log/robotname"
if [ -f $f ];
then # file exist
# get (new) name in file to variable nn
nn=`cat $f`
echo "found name " $nn
yy=$(expr length $nn)
if [ $yy -gt 2 ];
then # length is longer than 2 characters
if [ $hn != $nn ];
then # replace old hostname with new
echo ++++++++++ >> rebootinfo.txt
date >> rebootinfo.txt
echo new name is $nn, so rename host from $hn >> rebootinfo.txt
hostnamectl set-hostname $nn
sed -i "s/$hn/$nn/g" /etc/hosts
fi
fi
else
echo "File >" $f "< not found."
fi
The script needs to be run as root; it is, therefore set to run as part of the boot process.
Create the script in /etc/init.d
sudo nano /etc/init.d/host_rename.sh
Enter the following lines into the new file.
#!/bin/bash bash /home/local/svn/robobot/setup/rename_host.bash
Make the file executable and add it to run-level 2 (before networking is started)
sudo chmod +x /etc/init.d/host_rename.sh sudo ln -s /etc/init.d/host_rename.sh /etc/rc2.d/S99host_rename
The script is then executed when the Raspberry boots, and if the hostname does not match that of the Teensy, then the hostname is modified.
The script makes a note in the file '/home/local/svn/robobot/setup/rebootinfo.txt (owned by 'root') if the name is changed.
