What does an asterisk mean in terminal?
The shell interprets certain characters in filenames and for other purposes as well. It passes the interpreted version to commands. An asterisk at the end of a command line is treated the same way as an asterisk anywhere else on the line — it’s a wildcard that matches zero or more characters.
What does asterisk mean in bash?
zero or more characters
For example, the most commonly used special character is asterisk, * , meaning “zero or more characters”. When you type a command like ls a* , the shell finds all filenames in the current directory starting with a and passes them to the ls command. Quote marks affect the shell’s interpretation of the command line.
What does asterisk in filename mean?
The asterisk * is one of those special characters, it is part of the pattern matching notation and is used for filename expansion. In other words, commands such as echo *. txt will replace the pattern with the files that the pattern matches.
What does * mean in Linux command line?
In this case, we used the * wildcard to mean “all files in the current directory”. This command prints the line containing the given string, and if there’s more than one file in the list, the name of the file where it was found. To check files in subdirectories too, use the -r flag with the grep command.
What does the output of lsof look like?
The output from lsof is very wide. The leftmost columns are: The rightmost columns are: All columns do not apply to every type of open file. It is normal for some of them to be blank. Command : The name of the command associated with the process that opened the file. PID : Process Identification number of the process that opened the file.
What does device mean in Linux lsof command?
Device: Contains either the device numbers, separated by commas, for a character special, block special, regular, directory or NFS file, or a kernel reference address that identifies the file. It might also show the base address or device name of a Linux AX.25 socket device. Size/Off: Shows the size of the file or the file offset in bytes.
What do the columns mean in Linux lsof?
All columns do not apply to every type of open file. It is normal for some of them to be blank. Command : The name of the command associated with the process that opened the file. PID : Process Identification number of the process that opened the file. TID : Task (thread) Identification number.
What are the entries in the lsof command?
There are over 70 entries that might appear in the TYPE column. Some common entries you will see are: REG: Regular filesystem file. DIR: Directory. FIFO: First In First Out. CHR: Character special file. BLK: Block special file. INET: Internet socket.