10-03-2007
change list to comma seperated items
I have a list of servers in a file called serverlist like this
server1
server2
server3
i need to have them (with no trailing comma, the program does not like that)
server1,server2,server3
so far i have been using
HOSTS=/tmp/serverlist
HOSTS=${HOSTS:-$(grep -Ev "^#|^$" $HOSTS_LOCAL)}
HOSTS=$(echo $HOSTS |tr -s '\n ' ',,')
HOSTS=${HOSTS%,}
to achieve this. It works but is there a quicker easier way say like in one line. (I need the grep -Ev "^#|^$" because we have a lot and need to comment them out sometimes).
Sean
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HOSTS(5) File Formats Manual HOSTS(5)
NAME
hosts - host name data base
DESCRIPTION
The hosts file contains information regarding the known hosts on the network. For each host a single line should be present with the fol-
lowing information:
official host name
Internet address
aliases
Items are separated by any number of blanks and/or tab characters. A ``#'' indicates the beginning of a comment; characters up to the end
of the line are not interpreted by routines which search the file.
When using the name server named(8), this file provides a backup when the name server is not running. For the name server, it is suggested
that only a few addresses be included in this file. These include address for the local interfaces that ifconfig(8C) needs at boot time
and a few machines on the local network.
This file may be created from the official host data base maintained at the Network Information Control Center (NIC), though local changes
may be required to bring it up to date regarding unofficial aliases and/or unknown hosts. As the data base maintained at NIC is incom-
plete, use of the name server is recommend for sites on the DARPA Internet.
Network addresses are specified in the conventional ``.'' notation using the inet_addr() routine from the Internet address manipulation
library, inet(3N). Host names may contain any printable character other than a field delimiter, newline, or comment character.
FILES
/etc/hosts
SEE ALSO
gethostbyname(3N), ifconfig(8C), named(8)
Name Server Operations Guide for BIND
4.2 Berkeley Distribution May 14, 1986 HOSTS(5)