clear is hashed (/user/bin/clear) What does it mean?

mohammed.hossain · 10-24-2010, 03:38 PM

In the command prompt I entered:
Type clear
Response is:
clear is hashed (/user/bin/clear)
What is meant by "clear is hashed"?

In the command prompt I again entered:
Type exit
Response is:
exit is a shell builtin
What is meant by "exit is a shell builtin"?

onebuck · 10-24-2010, 07:53 PM

Hi,

Welcome to LQ!

Quote:

Originally Posted by mohammed.hossain

In the command prompt I entered:
Type clear
Response is:
clear is hashed (/user/bin/clear)
What is meant by "clear is hashed"?

In the command prompt I again entered:
Type exit
Response is:
exit is a shell builtin
What is meant by "exit is a shell builtin"?

Quote:

User Commands (1);
type [-aftpP] name [name ...] With no options, indicate how each name would be interpreted if used as a command name. If the -t option is used, type prints a string which is one of alias, keyword, function, builtin, or file if name is an alias, shell reserved word, function, builtin, or disk file, respectively. If the name is not found, then nothing is printed, and an exit status of false is returned. If the -p option is used, type either returns the name of the disk file that would be executed if name were specified as a command name, or nothing if ``type -t name'' would not return file. The -P option forces a PATH search for each name, even if ``type -t name'' would not return file. If a command is hashed, -p and -P print the hashed value, not necessarily the file that appears first in PATH. If the -a option is used, type prints all of the places that contain an executable named name. This includes aliases and functions, if and only if the -p option is not also used. The table of hashed commands is not consulted when using -a. The -f option suppresses shell function lookup, as with the command builtin. type returns true if any of the arguments are found, false if none are found.

I do suggest that you start by looking at 3, 4, 8 & 9 below so that you can understand what & how to do things correctly. Then you might consider 5 & 6 to continue your bash experiences.

Just a few links to aid you to gaining some understanding;

1 Linux Documentation Project
2 Rute Tutorial & Exposition
3 Linux Command Guide
4 Bash Beginners Guide
5 Bash Reference Manual
6 Advanced Bash-Scripting Guide
7 Linux Newbie Admin Guide
8 LinuxSelfHelp
9 Getting Started with Linux

The above links and others can be found at 'Slackware-Links'. More than just Slackware® links!