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Prepare command before executing

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# 1  
Old 11-16-2010
Prepare command before executing
Hi,

Couldnt find the right string" to search for a similar question..so dont know if this has been answered yet...problem is that I want to prepare a command with the requisite parameters passed as a string before executing it...eg: the ls command ..

I can pass "-l", "-t" as parameters and call the generic function as
Code:
ls "-l"    ## here ls would be the function called and not the generic ls command.
ls "-t"

etc..

the function I wrote was comething like:
Code:
ls()
{
Param1=$1
exec $(ls "$Param1")
}

any help? Platform is linux ..


Thanks in advance..
# 2  
Old 11-16-2010
you don't need to write a function just to perform an ls command : just ls -lt *
I think you problem is more about passing a list of file you want to ls so ...
Code:
for i in /etc /usr/var/cron
do
ls -lrt $i
done

or put your list in a file and scan it
Code:
[root@lyisy22:~/sand]# cat list
file1
file2
file3
file4
[root@lyisy22:~/sand]# while read f
> do
> ls -l $f
> done<list

# 3  
Old 11-16-2010
You need to load the function before using it, eg:
Code:
. myLsFunction

You also need to fix its code that way:
Code:
exec $(ls "$Param1")

should be
Code:
/bin/ls $param1

However, an alias seems more adequate for that particular need.
# 4  
Old 11-16-2010
Im trying to modify the "command" parameters itself
Hi,

Thanks for the early reply..
the ls was just an example...Im trying to modify another command which I have used at about a 100 places in the script...so to make it generic I wanted to write a function..

the command uses parameter a,b,c which perform totally different functions..


The ls command parameters need to be modified instead of the "file" parameters being passed...
# 5  
Old 11-16-2010
Quote:
Originally Posted by ctsgnb
Code:
[root@lyisy22:~/sand]# cat list
file1
file2
file3
file4
[root@lyisy22:~/sand]# while read f
> do
> ls -l $f
> done<list

You neither need a loop here, simply run:
Code:
ls -l $(<list)

# 6  
Old 11-16-2010
Hi jlliagre,

it didnt work for my command..
Ill paste the original code here ..just to be sure..file tmp.ksh
Code:
DialogBox ()  #Generic call to Dialog Function in Linux
{
Param1=$1               #IdSet
Param2=$2               #Title
Param3=$3               #Backtitle
Param4=$4               #Function
shift; shift; shift; shift;
ParamGeneric=$*         #Function Parameters

echo $Param1
echo $Param2
echo $Param3
echo $Param4
echo $ParamGeneric

dialog --title \"$Param2\" \
           --backtitle \"Param3\" \
           --$Param4 \"$ParamGeneric\" 10 70)


DialogBox 1 "Run"  "Run files on environment" msgbox  "  Warning...not tested on production ..for obvious reasons"


hope this clears it furthur..
the parameters being passed are expanded and thus acsue the number of arguments to grow...

running under ksh / Linux..
# 7  
Old 11-16-2010
Please provide more clues about what doesn't work, with error messages.
There is an extra closing parenthesis, param3 is missing a leading $, the script ending is dubious/truncated.
Why are you escaping the double quotes like this \" ?
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