如何在脚本中指出如果scp失败，请尝试wget

Question

I have this script :

cd /tmp/
scp user@8.8.4.1:/onboot/OTA.sh /tmp -i /usr/script/id 2> /dev/null
if
chmod 775 /tmp/OTA.sh
/tmp/OTA.sh &
sleep 30
rm -rf /tmp/OTA.sh

fi

I want to tell in the script that if the scp failed, try wget

Answer 1

man scp

EXIT STATUS
     The scp utility exits 0 on success, and >0 if an error occurs.

The exit status can be accessed using the variable $? in bash.

Answer 2

$? contains exit code of last called command. You can simply check if its non-zero:

scp user@8.8.4.1:/onboot/OTA.sh /tmp -i /usr/script/id 2> /dev/null
if [[ $? -ne 0 ]]
then
    #wget here
fi