Remove Command-Line Option from String


 
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# 1  
Old 07-07-2010
MySQL Remove Command-Line Option from String

I want to add a "-r <remote_host>" option to my ksh script, causing the script to run a script of the same name on the specified remote host. The remote invocation should itself include all the command-line options of the original invocation, less the -r option.

For example, this invocation:

# the_script -a -b -r the_remote_host -x x_option_value -y arg1 arg2

would execute this:

ssh the_remote_host the_script -a -b -x x_option_value -y arg1 arg2

My problem is removing the "-r <remote_host>" text from $* when bulding the remote invocation. I've tried sed, but I'm not getting it.
# 2  
Old 07-07-2010
Tools Don't laugh... strange, but appears to work for you.

Code:
C:\cygwin\tmp>echo the_script -a -b -r the_remote_host -x x_option_value -y arg1 arg2 | sed 's/-/~-/g' | tr "~" "\n" | egrep -v "\-r" | tr -d "\n"
the_script -a -b -x x_option_value -y arg1 arg2
C:\cygwin\tmp>

Note, interesting that:
Code:
C:\cygwin\tmp>echo the_script -a -b -r the_remote_host -x x_option_value -y arg1 arg2 | sed 's/-/~-/g' | tr "~" "\n"
the_script
-a
-b
-r the_remote_host
-x x_option_value
-y arg1 arg2

breaks your script out so each option is on its own line. perhaps useful?

Last edited by joeyg; 07-07-2010 at 06:50 PM.. Reason: added interesting fact
# 3  
Old 07-07-2010
That doesn't work for me:

Code:
$ echo the_script -a -b -r the_remote_host -x x_option_value -y arg1 arg2 | sed 's/-/~-/g' | tr "~" "\n" | egrep -v "\-" | tr -d "\n"
the_script $

I can't see how you got the output you did from that command. Where's the logic to check for "-r ..." and remove that part of the string?
# 4  
Old 07-07-2010
Code:
cat the_script
ssh ${@:4:1} ${@:1:2} ${@:5}

and you call it exactly like this
Code:
./the_script -a -b -r the_remote_host -x x_option_value -y arg1 arg2

# 5  
Old 07-07-2010
my previous cut/paste missed something

Matt,
try my previous post now... was missing a character somehow
should have been:


Code:
C:\cygwin\tmp>echo the_script -a -b -r the_remote_host -x x_option_value -y arg1 arg2 | sed 's/-/~-/g' | tr "~" "\n" | egrep -v "\-r" | tr -d "\n"
the_script -a -b -x x_option_value -y arg1 arg2
C:\cygwin\tmp>

And this won't care the order of your switches.
# 6  
Old 07-07-2010
Quote:
${@:4:1} ${@:1:2} ${@:5}
That looks like it's designed exclusively for the example I posted, but I'm looking for a more generic solution. The "-r <remote_host>" text might be anywhere in $@.

---------- Post updated at 09:03 PM ---------- Previous update was at 08:55 PM ----------

Quote:
sed 's/-/~-/g' | tr "~" "\n" | egrep -v "\-r" | tr -d "\n"
That works for the example I posted, but it seems to assume that the text I need to remove is bounded by minus signs. For example, if "-r ..." is the last option, and is followed by arguments, that code doesn't pass the arguments through:

Code:
# echo the_script -a -b -r the_remote_host arg1 arg2 | sed 's/-/~-/g' | tr "~" "\n" | egrep -v "\-r" | tr -d "\n"                     
the_script -a -b

The approach of splitting into multiple lines and using "grep -v" is interesting, though.
# 7  
Old 07-07-2010
Code:
options=$(sed 's/\(.*\) *-r [^ ]*\(.*\)/\1\2/' <<<"$@")
remHost=$(sed 's/.* *-r \([^ ]*\).*/\1/' <<<"$@")
ssh $remHost $options

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