Most programs will return an exit status of 0 if the program was successful, while a non-zero exit status usually indicates an error. You can find the exit status or exit code of the previously executed command by accessing the “$?” shell variable. $ COMMAND $ echo $? Typically when a command terminates on a [...]

For any number of reasons you may want to know the parent process ID of the current Bash script. You can find the parent process of the current Bash script or shell by printing the ‘$PPID‘ shell variable. $ echo $PPID20341

In many cases you will need to determine the PID of a current Bash script or shell. Bash stores a specific variable that allows you to view the process ID of the current shell “$$‘. You can echo the $$ to print the current PID. $ echo $$23490

At some point it may be helpful to have a BASH script dynamically determine the location of itself when executed from anywhere on the system. The following code will produce the canonicalized absolute pathname of the script, as well as the directory that it resides in. The script first determines if the the first argument [...]

When you run the find command on the root directory of a system you may want to exclude all network filesystems and confine your search to only your local machine. The benefits of this are obvious as it will save you a great amount of time especially if the mounted filesystem is very large. Luckily [...]

The find command allows you to recursively search and locate files on your system based on specific criteria. You can search by name, owner, group, type, permissions, date, as well as many others. The find command uses the following format: find [search_path(s)] [search_criteria] The following is the most basic way to run the find command. [...]