04-20-2011
Bash parameter expansion from a config file
Hi -
I am trying to do a simple config file with known variable names in it, e.g.:
contents of config file a.conf:
-a
-b $work
-c $host
simplified contents of bash script file:
work='trunk'
host='alaska'
opts=$(tr '\n' ' ' < a.conf)
opts="$opts $*"
mycommand $opts arg1 arg2
The goal is to get the script to execute:
mycommand -a -b trunk -c alaska arg1 arg2
But no matter what I try, it always comes out:
mycommand -a -b $work -c $host arg1 arg2
I have tried various quoting methods and evals, but no go.
Can anyone suggest the proper syntax for this?
Note: this is a highly simplified example so I would rather not have to do some kind of sed/awk substitution on the config file contents.
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LEARN ABOUT DEBIAN
nsd-checkconf
nsd-checkconf(8) nsd 3.2.12 nsd-checkconf(8)
NAME
nsd-checkconf - NSD configuration file checker.
SYNOPSIS
nsd-checkconf [-v] [-h] [-o option] [-z zonename] [-s keyname] configfile
DESCRIPTION
nsd-checkconf reads a configuration file. It prints parse errors to standard error, and performs additional checks on the contents. The
configfile format is described in nsd.conf(5).
The utility of this program is to check a config file for errors before using it in nsd(8) or zonec(8). This program can also be used for
shell scripts to access the nsd config file, using the -o and -z options.
OPTIONS
-v After reading print the options to standard output in configfile format. Without this option, only success or parse errors are
reported.
-h Print usage help information and exit.
-o option
Return only this option from the config file. This option can to be used in conjunction with the -z option. The special value zones
prints out a list of configured zones.
This option is primarily used by nsdc to parse the config file from the shell. If the -z option is given, but the -o option is not
given, nothing is printed.
-s keyname
Prints the key secret (base64 blob) configured for this key in the config file. Used to help shell scripts parse the config file.
-z zonename
Return the option specified with -o for zone 'zonename'.
If this option is not given, the server section of the config file is used. This option is primarily used by nsdc to parse the con-
fig file from the shell.
The -o, -s and -z option print configfile options to standard output.
FILES
/etc/nsd3/nsd.conf
default NSD configuration file
SEE ALSO
nsd(8), nsdc(8), nsd.conf(5), nsd-notify(8), nsd-patch(8), nsd-xfer(8), zonec(8)
AUTHORS
NSD was written by NLnet Labs and RIPE NCC joint team. Please see CREDITS file in the distribution for further details.
NLnet Labs jul 19, 2012 nsd-checkconf(8)