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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