cp5c0tt
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Having problems with IFS Variable using SSH
I have a perl script that needs to pass a string of code to a remote system via ssh. The code works perfectly while ssh'd into the command shell of the remote system, but when it is passed to the remote system via ssh, I am unable to manipulate the IFS Variable to and the code fails. I have tried sourcing ~./bashrc at the beginning of the command string, but to no avail. Any help would be greatly appreciated. Probably something simple with the enviornment, but it's driving me crazy.
Linux localsystem 2.6.18-53.el5 #1 SMP Wed Oct 10 16:34:19 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
Linux remotesystem 2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:15 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
(keys have properly installed between systems)
(This Works)
ssh remotesystem
echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
--------------------------
/home/program/jboss-eap-4.
0000000 \n
0000001
NUMBR:2
FILES
this
this is also a file
1.)this
2.)this is also a file
-------------
i:this
d41d8cd98f00b204e9800998ec
i:this is also a file
6607e4132c9a84526d2a11b279
(This Fails)
ssh remotesystem 'source ~./bashrc; echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
--------------------------
begin
/home/cscott/jboss-eap-4.2
0000000 \n
0000001
NUMBR:1
FILES
this
this is also a file
1.)this
this is also a file
2.)
-------------
i:this
this is also a file
,""
bash: ~./bashrc: No such file or directory
/usr/bin/md5sum: this
this is also a file: No such file or directory
Linux localsystem 2.6.18-53.el5 #1 SMP Wed Oct 10 16:34:19 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
Linux remotesystem 2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:15 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
(keys have properly installed between systems)
(This Works)
ssh remotesystem
echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
--------------------------
/home/program/jboss-eap-4.
0000000 \n
0000001
NUMBR:2
FILES
this
this is also a file
1.)this
2.)this is also a file
-------------
i:this
d41d8cd98f00b204e9800998ec
i:this is also a file
6607e4132c9a84526d2a11b279
(This Fails)
ssh remotesystem 'source ~./bashrc; echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
--------------------------
begin
/home/cscott/jboss-eap-4.2
0000000 \n
0000001
NUMBR:1
FILES
this
this is also a file
1.)this
this is also a file
2.)
-------------
i:this
this is also a file
,""
bash: ~./bashrc: No such file or directory
/usr/bin/md5sum: this
this is also a file: No such file or directory
ASKER
Yes, I fixed the ~/.bashrc, hazards of cut and paste ;-)
Here is the applicable output from your recommeded change -
then for i in ${FILES[*]}; do echo -e "i:$i:";
---- OUTPUT -----
i:this
this is also a file:
---- END ----
As I mentioned earlier, this code works perfectly when I ssh into a shell on the remote machine, it is only when I pass the code to the remote machine via an ssh command. For some reason (I suspect Security) the IFS Variable can not be manipulated.
Thank you for your input arobert11!
Here is the applicable output from your recommeded change -
then for i in ${FILES[*]}; do echo -e "i:$i:";
---- OUTPUT -----
i:this
this is also a file:
---- END ----
As I mentioned earlier, this code works perfectly when I ssh into a shell on the remote machine, it is only when I pass the code to the remote machine via an ssh command. For some reason (I suspect Security) the IFS Variable can not be manipulated.
Thank you for your input arobert11!
Nope, you can play happily play around with the IFS variable in a remote shell e.g.
ssh localhost 'echo -e "begin\n\n\n"; cd $HOME/boo; pwd; IFS=$'\n'; echo $IFS | od -c; FILES=( $(find ./ -maxdepth 1 -type f -printf "%f\n" ) ); echo -e "NUMBR:${#FILES[*]}\nFILES
It's the escaping in your example that's the issue.
ssh localhost 'echo -e "begin\n\n\n"; cd $HOME/boo; pwd; IFS=$'\n'; echo $IFS | od -c; FILES=( $(find ./ -maxdepth 1 -type f -printf "%f\n" ) ); echo -e "NUMBR:${#FILES[*]}\nFILES
It's the escaping in your example that's the issue.
With your host / file names:
ssh remotesystem 'echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
ssh remotesystem 'echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
Appears I have the same cut-n-paste issues, as your good self:
ssh remotesystem 'echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
ssh remotesystem 'echo -e "begin\n\n\n"; cd /home/program/jboss-eap-4.
ASKER CERTIFIED SOLUTION
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ASKER
arobert11 you rock. Thanks! I believe my issue stemmed from the (incorrect) thought that the find was storing the results into $FILES (at least that is what I was trying to do) as an array based on the -printf "$f\n" statement.
In anycase modifying the -printf to use ":" instead of "\n", allowed me to process the list using the IFS as a colon. Awesome, Thanks again!
In anycase modifying the -printf to use ":" instead of "\n", allowed me to process the list using the IFS as a colon. Awesome, Thanks again!
ASKER
BTW Final code snippet: (If anyone cares :-P )
ssh remotesystem 'cd /home/program/jboss-eap-4.
--------- Desired Output --------------------------
d41d8cd98f00b204e9800998ec
6607e4132c9a84526d2a11b279
--------- End of Output --------------------------
ssh remotesystem 'cd /home/program/jboss-eap-4.
--------- Desired Output --------------------------
d41d8cd98f00b204e9800998ec
6607e4132c9a84526d2a11b279
--------- End of Output --------------------------
Your:
source ~./bashrc;
should probably read:
source ~/.bashrc;
Anyway I don't believe that's your problem, as I dought your file loop:
for i in ${FILES[*]}; do echo -e "i:$i";
Will return the individual files, stick an extra colon on the end or you echo to prove this e.g.
echo -e "i:$i:";