Re: bash question

Alex Samad wrote:

Hi, i have this:

RDSCHM="--remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'"

and trying this

rdiff-backup \
$RDSCHM \
$RDRM \
"$DEST/"

with sh -x i get this

+ rdiff-backup --remote-schema ''\''ssh' -i /root/.ssh/id_backup -C %s rdiff-backup '--server'\''' --remove-older-than '"10B"' --force max::/backups/test/system/

I am pretty sure you are using bash as the sh link, do 'ls -la /bin/sh' to get: /bin/sh --> /bin/bash
If it were dash the responses would be different.

Testing: set up a "test" file with:
#!/bin/sh
RDSCHM="--remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'"
echo $RDSCHM
echo "$RDSCHM"
with: bash -x test, I get:
+ RDSCHM='--remote-schema '\''ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'\'''
+ echo --remote-schema ''\''ssh' -i /root/.ssh/id_backup $'-C\302\240%s' 'rdiff-backup --server'\'''
--remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'
+ echo '--remote-schema '\''ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'\'''
--remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'

with: dash -x test, I get:
+ RDSCHM=--remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'
+ echo --remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'
--remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'
+ echo --remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'
--remote-schema 'ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'

with dash there is no « ''\''ssh' »

Also, did you notice the difference between a command on an unquoted variable and a quoted one?
+ echo --remote-schema ''\''ssh' -i /root/.ssh/id_backup $'-C\302\240%s' 'rdiff-backup --server'\'''
+ echo '--remote-schema '\''ssh -i /root/.ssh/id_backup -C %s rdiff-backup --server'\'''

Conclusion: Quoting the variable will solve your problem, as this:
rdiff-backup \
"$RDSCHM" \
"$RDRM" \
"$DEST/"


the ''\''ssh' is the confusing bit it is seperate out the ssh and the -i.

Yes, on a bash shell, but only while quoting with -x, the actual command does the right thing.

what can I do to prevent this.

Just put « $RDSCHM » inside quotes as this: « "$RDSCHM" »

My reading has lead me to IFS variable
but I don't want to start playing with this yet ! I think I am just
missing something. Hopefully the ml eyes will be able to see what i
can't

No need to....

oh and its using dash well sh

It does not really matter which shell it is, when the issue is about correct quoting of variables.

--
Antonio Perez


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