Shell Programming and Scripting

scp /path/to/file/filename user@host:/destination/path/

ssh user@host test -d /destination/path/ && echo exists

exec request failed on channel 0

if scp "$sourcepath" "$destpath"
then	echo "scp of $sourcepath to $destpath succeeded"
else	# Add "scp $sourcepath $destpath" to a list of copy commands that
	# need to be rerun later.
	echo "scp \"$sourcepath\" \"$destpath\"" >> /path/to/todo_list
	# Note that the diagnostic from scp will serve as your visual
	# indication that the scp failed this time, but you can also add
	# your own diagnostic here if you want to.
fi

scp "$sourcepath" "$destpath" &&
    echo "scp \"$sourcepath\" \"$destpath\" succeeded" ||
    echo "scp \"$sourcepath\" \"$destpath\"" >> /path/to/todo_list

scp -o ConnectTimeout=5 file user@host:/dir/

#!/bin/bash

LC_ALL=C
SSH_PORT=22
SSH_OPTS="-o ConnectTimeout=5 -o PasswordAuthentication=No"

export LC_ALL SSH_PORT SSH_OPTS

ping_test()      { ping -w 3 -i 0.2 -c3 "$1" &>/dev/null ; }
port_test()      { nmap -p $SSH_PORT -P0 "$1" | grep -qE "$SSH_PORT/tcp.*open" ; }
sshd_test()      { ssh -o Port=$SSH_PORT $SSH_OPTS -v "$1" date 2>&1 | grep -qE "Remote protocol version [0-9]+" ; }
ssh_login_test() { ssh -o Port=$SSH_PORT $SSH_OPTS "$1" echo ssh connect success 2>&1 | grep -qE "ssh connect success" ; }

check_ssh() {
  
   local target="$1"
   ping_test       "$target"    || return 1
   port_test       "$target"    || return 2
   sshd_test       "$target"    || return 3
   ssh_login_test  "$target"    || return 4   # this can be done as the same step with the step before
   return 0

}

# -- start of main program  

if check_ssh my_hostname; then
  if scp ... 
     ...
  fi
fi