Shell scripts are a series of commands written in order of execution. These scripts can contain functions, loops, commands, and variables. Scripts are useful for simplifying a complex series of commands and repetitive tasks. In this article, you will learn how to create and execute shell scripts...
You get this error when you attempt to read or write to a file or directory that you’re not allowed to access (you have insufficient privileges). This error also shows when you try to execute a file that does not have the execute bit set (even if you can read the file). You’ll ...
meaning that when you execute the program, it runs as though the file owner is the user instead of you. Many programs use this setuid bit to run as root in order to get the privileges they need to change system files. One example is the passwd...
Execute a Shell Command Using popen() Thepopen()command allows a user to execute the shell command exclusively as a read or a write. The function is a pipe stream that opens a process by creating that pipe, forking, and invoking a shell! All from one command, not too bad, not too b...
This chapter is a guide to the Unix commands and utilities that will be referenced throughout this book. This is preliminary material, and you may ...
When you execute a command in Linux, it generates a numeric return code. This happens whether you're running the command directly from the shell, from a script, or even from anAnsibleplaybook. You can use those return codes to handle the result of that command properly. ...
To record all commands entered into the shell in a linux environment to a log file. This can be useful for auditing user actions or for security audits. This is not specific to Confluence or any product, but it will audit command line actions including those things related to Confluence. Se...
You can use thewhichcommand to figure out whether a command is internal or external. It prints the location from where the specified command executes. Internal commands are part of the shell and execute directly from the shell. If the given command is internal, It does not display any output...
Method 1: Listing Commands With the compgen Shell Built-in At the command line, type compgen -c | more to list every command you can run. Use the space bar each time you’d like to go down another long page of text. You’ll notice that this utility has an extremely broad idea of ...
Run the following commands and verify the new file permission. We can specify multiple permissions with a single command. Use a comma to separate them. For example, the following command first adds the write permission for the group and then removes the execute permission for others. ...