Escaping commands in ssh connection via for loop

Question

#!/bin/bash
for x in ontwikkelkaart
do
    echo "***";
    echo ${x};

    ssh ${x}@localhost "
        find ~/public_html/wp-content/themes/ -type f -name "*.webp" | awk '{ gsub(".webp$", "") ; print $0 }' | xargs -i sh -c 'if [ ! -f "{}" ]; then echo {}.webp; fi' \;
    "
done

I have the above script that connects to a server via SSH, it checks wether there are webp files with no jpg/png as source file; and echo's rm "filename".

The command:

find ~/public_html/wp-content/themes/ -type f -name "*.webp" | awk '{ gsub(".webp$", "") ; print $0 }' | xargs -i sh -c 'if [ ! -f "{}" ]; then echo {}.webp; fi' \;

Works when i run it on the command line of the server (via SSH), but when i try to do it in the for loop, it does not work because of the "".

Can someone (try to) explain why the above code does not work?

better to do that is create an script and do ssh user@servername bash < your_local_script.bash — c4f4t0r
– c4f4t0r, Commented Feb 19, 2019 at 13:06
Or scp the file and run that on the target server with the ssh command. — Paul Hodges
– Paul Hodges, Commented Feb 19, 2019 at 14:02

nullPointer · Accepted Answer · 2019-02-19 13:44:29Z

1

Try using a heredoc :

ssh -q -T ${x}@localhost 2> /dev/null <<'EOF'
find ~/public_html/wp-content/themes/ -type f -name "*.webp" | awk '{ gsub(".webp$", "") ; print $0 }' | xargs -i sh -c 'if [ ! -f "{}" ]; then echo {}.webp; fi' \;
EOF

edited Feb 19, 2019 at 13:44

answered Feb 19, 2019 at 13:04

nullPointer

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3 Comments

user2739456 Over a year ago

Thanks, but when i run the above i get the following error: images.sh: line 13: warning: here-document at line 7 delimited by end-of-file (wanted EOF') images.sh: line 14: syntax error: unexpected end of file`

nullPointer Over a year ago

@user2739456 Is the EOF line indented? It has to be at the beginning of the line

mickp Over a year ago

I'd suggest qutoing the first 'EOF' or variables such as $0 will get expanded inside the here-doc.

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