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Linux Tutorial Topics:
Note that any given object can relate to more than one topic, so it is likely that pages will appear more than once. For example, concepts may relate to topics that are slightly different from the topic of the page where they are discussed in detail. Programming
Pages
Editing Files -> Sed -> Sed
Editing Files -> Awk -> Awk
Editing Files -> Perl -> Perl
Concepts
Unwanted cron output can be redirected just like any other command.
There are six primary file types - regular, directory, block device, character device, named pipe and symbolic link.
The current directory is typically not part of the root user's search patch.
Use the 'chmod' command to make shell scripts executable.
A common reason commands are not found is that they are not in your path
Multiple pipes can be used to combine multiple commands.
You can use the find command to search for specific files on your system.
Error messages can be sent to a file using the construct "2> file_name"
Three files are opened by the shell when your start it- standard input, standard output and standard error.
Positional parameters can be assigned to variables to make them easier to identify.
The position parameter $0 refers to the script that is being executed.
In a script, multiple if-statements could be combined into a case-statement.
The file command can be used to determine the type of file.
You can assign the output of a command to a variable using backticks like this VAR=`command`.
Linux only looks in your search path to find commands and programms.
To change into a directory you actually need "execute" permissions on the directory.
When a shell variable is defined, it is NOT automatically available to subsequent processes.
Another term for wildcards is metacharacters.
Curly braces {} can be used to combine variables.
When using position parameters in a script, they need to be proceeded with a $, just like any other variable.
The number of position parameters (i.e arguments) is stored in the special variable $#.
The special variable $0 contains the name of the script being executed.
Symbolic links can refer to files or directories on different filesystems.
The 'umask' command sets the default permissions for newly created files.
Applications react to "terminal capabilities" as apposed to specific keys.
The regular expression [:alnum:] matches alpha-numeric characters in all supported languages.
The root user can configure cron to run jobs as a particular user by placing them in /etc/crontab.
On busy systems cronjobs might end up being skipped if they are run every minute.
Each entry in the /etc/printcap file consists of single logical line.
When accessing the hard disk, processes are "put to sleep" to wait their turn.
System process that run in the brackground are typically referred to as daemon processes.
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