16 окт. 2011 г. · If you want to test whether a command succeeded or not, use the command itself directly with if, as shown above.

24 окт. 2012 г. · I am trying to do an IF statement from the output of an executed commmand. Here is how I am trying to do it, but it doesn't work. Does anyone know the right ...

9 окт. 2019 г. · I'd like to have a very simple condition that will only execute if the command fails. In this example it's a conditional based on the SUCCESS of the command.

1 мар. 2022 г. · I just have a process like test_1.sh that could result in success (return code 0), or failure (anything other than 0). I want something like ...

19 янв. 2022 г. · This works great when I expect commands to succeed; if any fails, the set -e will exit the script early with a non-zero exit code.

4 окт. 2016 г. · The if statement takes a command (or series of commands!) and runs them, and then checks the success value at the end.

11 июн. 2015 г. · && executes the command which follow only if the command which precedes it succeeds. || does the opposite: update-system-configuration || echo "Update failed"

15 мая 2018 г. · In bash $? gives you the return code of the previous command. If the previous command was successfull the return code is zero else non-zero.

22 июн. 2020 г. · Shell builtin commands return a status of 0 (true) if successful, and non-zero (false) if an error occurs while they execute. All builtins ...

25 дек. 2014 г. · I was trying to execute a program which will create a directory on the basis of a complete path provided to it from the prompt and, if the directory already ...