Bash-查找脚本并使用选项执行

Question

I did a good bit of searching and testing on my own, but I can't seem to find the best way to achieve this goal. I would like to have a bash one liner that will find a script on the machine, execute the script and have the ability to add switches or needed information in my case to execute the script successfully.

To get a little more specific, I am in Kali Linux and I run the locate command like so:

locate pattern_create

which returns:

/usr/share/metasploit-framework/tools/pattern_create.rb

So I thought about piping this into xargs to run the script like so:

locate pattern_create | xargs ruby

but of course I could not specify the options I need to that would run the script successfully, which would be:

ruby /usr/share/metasploit-framework/tools/pattern_create.rb 2700

I came up with a work around, but I feel that it's somewhat sloppy and this could be done easier, and that's where I hope I could get any input/feedback.

I found out I can run:

pattern_create=$(locate pattern_create) && ruby $pattern_create 2700

to get exactly what I need, but then I am dealing with environment variables which I would not want a bunch of when doing this often. I was hoping to figure this out with xargs or maybe and even cleaner way if possible. I know this can be done easily with find -exec, but that won't work in my case where I don't where the script is stored.

Any help would be awesome, I appreciate everyone's time. Thank you.

Answer 1

You can do:

ruby $(locate pattern_create)

But be aware that if there are multiple lines returned by locate , then this may not do what you wanted.

Answer 2

This is a dangerous thing to do as you do not know what locate will return and you could end up executing arbitrary scripts. I suggest that you use an intermediate script which will protect against the unexpected, such as finding no scripts or finding more than one.

#! /bin/sh
#
if [ $# -eq 0 ]
then
    echo >&2 "Usage: $0 script arguments"
    exit -1
fi
script=$(locate $1)
numfound=$(locate $1 | wc -l)
shift
if [ $numfound -eq 1 ]
then
    # Only run the script if exactly one match is found
    ruby $script $*
elif [ $numfound -eq 0 ]
then
    echo "No matching scripts found" >&2
    exit -1
else
    echo "Too many scripts found - $script" >&2
    exit -1
fi