updating_system.sh

#!/usr/bin/env bash

log_error_location='/root/Desktop'  # Defining a location to store the error log that will be generated.
time_for_update=600  # Time limit for 'update'.
time_for_upgrade=600  # Time limit for 'upgrade'.

echo -e "Executing update...\n\n"

error_update=$(timeout $time_for_update sudo apt-get update 2>&1 > /dev/null)  # Executing the 'update' command with a
# limit of 5 minutes to its conclusion. Capturing the STDERR, if it generates any error.

update_status=$?  # Storing the exit status from the 'update' command.

if [ $update_status -ne 0 ]; then  # Checking if the 'update' command wasn't successful:

  echo; echo
  echo "Update failed. Code: $update_status"  # Printing a error message and the code returned by the 'update' function
  echo -n "$(date): " >> "$log_error_location/error.log"
  echo -n "[Status]: $update_status - " >> "$log_error_location/error.log"
  echo -ne "Update failed: ($error_update)\n" >> "$log_error_location/error.log"
  # Storing the STDERR and the exit status from the 'update' command into a log file.
  exit $update_status  # Exiting the script using the status from 'update' command.

else  # If the 'update' command is successful, the script follows to executing the 'upgrade' command:

  echo; echo
  echo "Update successful. Code: $update_status"; echo "Executing upgrade..."  # Printing a message that the 'update'
  # was successful.
  echo; echo

  error_upgrade=$(timeout $time_for_upgrade echo "yes" | sudo apt-get upgrade 2>&1 > /dev/null)  # Executing the
  # 'upgrade' command with a limit for 10 minutes for the conclusion. Also capturing the STDERR generated by the command,
  # if it generates any error.
  upgrade_status=$?  # Capturing the exit status from 'upgrade'.

  if [ $upgrade_status -ne 0 ]; then  # Checking if the execution of 'upgrade' wasn't successful:

    echo; echo
    echo "Upgrade failed. Code: $upgrade_status"  # Printing a error message and the exit status from 'upgrade'
    echo -n "$(date): " >> "$log_error_location/error.log"
    echo -n "[Status]: $upgrade_status - " >> "$log_error_location/error.log"
    echo -ne "Upgrade failed: ($error_upgrade)\n" >> "$log_error_location/error.log"
    # Storing the STDERR and log status generated by the 'upgrade' command into a log file.
    exit $upgrade_status  # Exiting the script with the exit status returned by 'upgrade' command.

  else  # If the 'upgrade' command was successfully executed:

    echo; echo
    echo "Upgrade successful. Code: $upgrade_status"; echo "Finishing updating procedure..."  # Printing a successful
    # message using the exit status from 'upgrade'.
    exit $upgrade_status  # Exiting the script using the exit status from 'upgrade' command.

  fi

fi