In Bash, the exit code of a command can be accessed using the special variable $?. The exit code is a numeric value that represents the status of the command’s execution. A value of 0 typically indicates success, while a non-zero value indicates failure.
Here is an example of how to check the exit code of a command:
command
echo "Exit code: $?"
You can also use command substitution to assign the exit code to a variable:
result=$(command)
echo "Exit code: $?"
You can also use && operator to execute a command only if the previous command was successful.
command1 && command2
You can also use || operator to execute a command only if the previous command was unsuccessful.
command1 || command2
In addition, you can use if statement to check the exit code and take different actions based on the result:
if command; then
echo "Command succeeded"
else
echo "Command failed"
fi
Note: These are just general examples, for more detailed and accurate steps please refer to the official documentation of Bash and Linux/Unix.