Verifying if a file exist (script shell)

Question

This is my code:

 nb_lignes=`wc -l $1 | cut -d " " -f1`
 for i in $(seq $(($nb_lignes - 1)) )
 do
 machine=`head $1 -n $i | tail -1`
 machine1=`head $1 -n $nb_lignes | tail -1`
 ssh  root@$machine -x " scp /home/file.txt root@$machine1:/home && rm -r /home/file.txt"
 done

I'd like to verify if file.txt exist in such machine before the scp et rm ,Please i ask how can i modify this script ?

Thank you.

There is a fi in your code, but I don't see any if. Can you please review your code? — Bruno von Paris
– Bruno von Paris, Commented Oct 20, 2012 at 21:56

P.P · Accepted Answer · 2012-10-20 11:08:12Z

1

You can use test command: test -f file && scp ...

     ssh  root@$machine -x " test -f /home/file.txt && scp /home/file.txt
root@$machine1:/home && rm -r /home/file.txt"

answered Oct 20, 2012 at 11:08

P.P

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11 Comments

user1735757 Over a year ago

Please i have this error at run: Host key verification failed. lost connection have you an idea please ?

P.P Over a year ago

That means your ssh connection failed due to authorization issue. Add sshkeys. Here's how to do it: ssh keygen

user1735757 Over a year ago

$machine1 is a variable, i add a quote ?

P.P Over a year ago

No, there's nothing with the command/script. ssh fails due to sshkey mismatch/no keys. You have to add the keys and follow that link for instructions on how to add ssh keys.

user1735757 Over a year ago

i have teste with other command ssh root@$machine -x "java..." and it works without pb

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