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Full Discussion: Hostsfile generator
Top Forums Shell Programming and Scripting Hostsfile generator Post 303040870 by Marti95 on Friday 8th of November 2019 04:43:30 AM
Old 11-08-2019
Hostsfile generator

Hello

I use a bash script to creating the hosts file /etc/hosts
Quote:
#!/bin/bash
System is Centos7
But there is a bug inside my output and I want to fix this.

My Array looks like this:
Code:
205,IP         111.122.133.20 
205,HOST2      unas           
205,HOST1      unas15533      
205,COMMENT    # UNAS         
775,IP         111.122.133.77 
775,HOST2      wlan           
775,HOST1      15533-wlan     
775,COMMENT    # WLAN Access Point
1015,IP        111.122.133.101
1015,HOST2     rdp1           
1015,HOST1     15533-rdp1     
1015,COMMENT   # RDP-Terminal 1
1025,IP        111.122.133.102
1025,HOST2     rdp2           
1025,HOST1     15533-rdp2     
 1025,COMMENT   # RDP-Terminal 2

The created hosts file looks something like this:
Quote:
# x.x.x.001 - x.x.x.020 ----- Gateway, Switch, Picco und Sicherung
192.168.123.1 123wan wan # Opensystem Gateway
192.168.123.2 123switch1 switch1 # Switch 1
192.168.123.3 123switch2 switch2 # Switch 2
192.168.123.5 123imm1 imm1 # IMM 1
192.168.123.20 unas123 unas # UNAS Sicherung

# x.x.x.41 - x.x.x.50 Server
192.168.123.41 123virtsrv1 virtsrv1 # CentOS

# x.x.x.161 - x.x.x.190 ----- Netzwerkdrucker
192.168.123.161 123mps1 mps1 # Netzwerkdrucker 1
192.168.123.162 123mps2 mps2 # Netzwerkdrucker 2
192.168.123.163 123mps3 mps3 # Netzwerkdrucker 3
192.168.123.164 123mps4 mps4 # Netzwerkdrucker 4

# #x.x.x.191 - x.x.x.199 ----- WPS Drucker und PreisChecker
192.168.123.191 123toschiba1 toschiba1 # Toshiba WPS 1
192.168.123.192 123toschiba2 toschiba2 # Toshiba WPS 2

# 10.168.123.xxx ----- DMZ
10.168.123.2 123rowa rowa # Rowa (DMZ)
I creat the hosts file with this command:
Code:
echo "===================================================="
d=`date +%Y%m%d`
touch "/tmp/hosts.${d}"
IFS=$'\n'
echo "${!ENTRIES[*]}" | sort -t, -k1,1n -k2,2.2r -k2.3 | while read IX; do printf "%-10s\n" ${ENTRIES[$IX]}; done | paste -sd"\t\t\t\n" >> "/tmp/hosts.${d}"
echo "Script finished"
echo "===================================================="

I would like to format the file so that the distances are even (sometimes there is a bigger gap between IP and hosts1, between hosts 1 and hosts 2, ...).
Also, I do not want to use tabs because this causes problems.

Thank you for the help Smilie
 

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SYSTEMD-RC-LOCAL-GENERATOR(8)				    systemd-rc-local-generator				     SYSTEMD-RC-LOCAL-GENERATOR(8)

NAME
systemd-rc-local-generator - Compatibility generator for starting /etc/rc.local and /usr/sbin/halt.local during boot and shutdown SYNOPSIS
/lib/systemd/system-generators/systemd-rc-local-generator DESCRIPTION
systemd-rc-local-generator is a generator that checks whether /etc/rc.local exists and is executable, and if it is pulls the rc-local.service unit into the boot process. This unit is responsible for running this script during late boot. Note that the script will be run with slightly different semantics than the original System V version, which was run "last" in the boot process, which is a concept that does not translate to systemd. The script is run after network.target, but in parallel with most other regular system services. systemd-rc-local-generator also checks whether /usr/sbin/halt.local exists and is executable, and if it is pulls the halt-local.service unit into the shutdown process. This unit is responsible for running this script during later shutdown. Support for both /etc/rc.local and /usr/sbin/halt.local is provided for compatibility with specific System V systems only. However, it is strongly recommended to avoid making use of these scripts today, and instead provide proper unit files with appropriate dependencies for any scripts to run during the boot or shutdown processes. systemd-rc-local-generator implements systemd.generator(7). SEE ALSO
systemd(1), systemctl(1) systemd 237 SYSTEMD-RC-LOCAL-GENERATOR(8)
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