Sponsored Content
Top Forums Shell Programming and Scripting Bash parameter expansion from a config file Post 302515572 by mrengert on Wednesday 20th of April 2011 12:14:09 PM
Old 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.
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

removing html tags via parameter expansion

Hi all- I have a variable that contains a web page: echo $STUFF <html> <head> <title>my page</title></head> <body> blah blah etc.. Can I use the shell's parameter expansion abilities to remove just the tags? I thought that FIXHTML=${STUFF//<*>/} might do it, but it didn't seem to... (2 Replies)
Discussion started by: rev66
2 Replies

2. Shell Programming and Scripting

Need help with parameter expansion

Say you have this numeric variable that can be set by the user but you never want it to leave a certain range when it gets printed. How could you use parameter expansion such that it will never expand outside of that boundary? Thanks ---------- Post updated at 11:09 PM ---------- Previous update... (3 Replies)
Discussion started by: stevenswj
3 Replies

3. Shell Programming and Scripting

Parameter expansion not working for all strings...

I'm trying to write a script that parses my music collection and hard link some filenames that my media player doesn't like to other names. To do this I need to extract the name and remove alla non ASCII characters from that and do a cp -l with the result. Problem is this: 22:16:58 $... (8 Replies)
Discussion started by: refuser
8 Replies

4. UNIX for Dummies Questions & Answers

Parameter Expansion with regular expression

Hello experts, I am exploring parameter expansion, and trying to cut the fields in a URL. Following is the requirement: I have // abc.nnt /dir1/dir2/dir3/dir4/somefile.java What i need to get is the path after dir3, and dir3 will be passed. output that i need is... (1 Reply)
Discussion started by: gjarms
1 Replies

5. Shell Programming and Scripting

Bash Parameter Expansion

I have made the following examples that print various parameter expansions text: iv-hhz-sac/hpac/hhz.d/iv.hpac..hhz.d.2016.250.070018.sac (text%.*): iv-hhz-sac/hpac/hhz.d/iv.hpac..hhz.d.2016.250.070018 (text%%.*): iv-hhz-sac/hpac/hhz (text#*.): d/iv.hpac..hhz.d.2016.250.070018.sac... (2 Replies)
Discussion started by: kristinu
2 Replies

6. Shell Programming and Scripting

Bash Parameter Expansion

#!/bin/bash SNMPW='/usr/bin/snmpwalk' while read h i do loc=$($SNMPW -v3 -u 'Myusername' -l authPriv -a SHA -A 'Password1' -x AES -X 'Password2' $i sysLocation.0 2>/dev/null) loc=${loc:-" is not snmpable."} loc=${loc##*: } loc=${loc//,/} echo "$i,$h,$loc" done < $1 My question is ... ... (1 Reply)
Discussion started by: sumguy
1 Replies

7. Shell Programming and Scripting

Bash : More parameter expansion and IFS

I am trying to become more fluent with the interworking of bash and minimize the number of external calls. Sample Data. This will be the response of the snmp query. SNMPv2-MIB::sysName.0 = STRING: SomeHostName SNMPv2-MIB::sysObjectID.0 = OID: SNMPv2-SMI::enterprises.9.1.1745... (5 Replies)
Discussion started by: sumguy
5 Replies

8. UNIX for Beginners Questions & Answers

How to Grep second word in config file using parameter?

Currently i am building one script to grep region records in the config file based on parameter and then i am creating a text file with that out put and i am reading the source file path in that out put file now i need to pass one more parameter like module based upon that it has to create a... (1 Reply)
Discussion started by: saranath
1 Replies

9. Shell Programming and Scripting

Bash : Parameter expansion ${var:-file*}

Example data $ ls *somehost* 10.10.10.10_somehost1.xyz.com.log 11.11.11.11_somehost2.xyz.com.log #!/bin/bash #FILES="*.log" FILES=${FILES:-*.log} for x in $FILES do ip="${x%%_*}" # isolate IP address x="${x##*_}" # isolate hostname hnam="${x%.*}" # Remove the ".log"... (2 Replies)
Discussion started by: popeye
2 Replies

10. Shell Programming and Scripting

Use parameter expansion over a parameter expansion in bash.

Hello All, Could you please do help me here as I would like to perform parameter expansion in shell over a parameter expansion. Let's say I have following variable. path="/var/talend/nat/cdc" Now to get only nat I could do following. path1="${path%/*}" path1="${path1##*/}" Here... (8 Replies)
Discussion started by: RavinderSingh13
8 Replies
sb2-config(1)							sb2-config man page						     sb2-config(1)

NAME
sb2-config - scratchbox2 configuration tool SYNOPSIS
sb2-config [OPTION]... [COMMAND [PARAMS]] DESCRIPTION
sb2-config is used to set and display configuration of existing targets. OPTIONS
-d default_target This option sets the default sb2 target. The name of the target will be written to your $HOME/.scratchbox2/config file. -l lists all available targets in your system. The names listed can be used as a parameter to the -d option. -h Display short help. -v Show version of this tool. -t target select target to be used with commands (below) COMMANDS
showtarget show default target. showlog show configuration log showenv show target-specific environment variables setenv VARIABLE VALUE set target-specific environment variable. The value becomes effective when sb2 is executed. clearenv VARIABLE set clearing for target-specific environment variable unsetenv VARIABLE remove target-specific environment variable EXAMPLES
$ sb2-config -d diablo41_armel This command sets your default target to be diablo41_armel. $ sb2-config -l This example lists all installed targets in your host. The names listed can be used as a parameter to the -d option. SEE ALSO
sb2(1), sb2-init(1), sb2-show(1) AUTHOR
Lauri Leukkunen 2.2 17 December 2010 sb2-config(1)
All times are GMT -4. The time now is 04:37 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy