get checksum of files inside tar archive on remote host

Question

I succeed to obtain the md5sum of files inside archive without using file system thanks to :

tar tjf '/home/adup/mybackup.tar.bz2' | sort | grep -v '/$' |
( while read filename;
    do md5=$(tar xjOf '/home/adup/mybackup.tar.bz2' $filename | md5sum | awk '{print $1}'); 
    echo "$md5  $filename";
done)

Unfortunately what I need is to do on a remote host over ssh like :

ssh 192.9.202.44 tar tjf '/home/adup/mybackup.tar.bz2' | sort | grep -v '/$' |(  while read filename; do md5=$(tar xjOf '/home/adup/mybackup.tar.bz2' $filename | md5sum | awk '{print $1}'); echo "$md5  $filename"; done)

But like that it doesn't work, one of the tar command is interpreted locally and give me such error :

tar (child): /home/adup/mybackup.tar.bz2 : no such file

Please , is somebody can tell me how to proceed?

Thanks in advance,

Answer 1

You need to pass to ssh the commands to be executed remotely as one string:

ssh 192.9.202.44 "tar tjf '/home/adup/mybackup.tar.bz2' | sort | grep -v '/\$' |(  while read filename; do md5=\$(tar xjOf '/home/adup/mybackup.tar.bz2' \$filename | md5sum | awk '{print $1}'); echo "\$md5  \$filename"; done)"

Also, make sure characters like $, which are interpreted by the local shell, are quoted.

The longer the script gets, the easier to make a mistake doing all this quoting. It can be easier to write a 'normal' shell script, copy it to the remote host with scp, and then execute with ssh.