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Full Discussion: Need some help with my homework
Homework and Emergencies Homework & Coursework Questions Need some help with my homework Post 302494314 by ghostdog74 on Sunday 6th of February 2011 09:09:40 PM
Old 02-06-2011
Quote:
Originally Posted by ilikecows
1. Because the PATH variable defines the directories your shell looks in for commands you type that aren't built into the shell. For instance if you type ls, and ls isn't an internal shell command, it looks through the directories in PATH for an executable file with the same name as the command you typed and tries to execure it. /bin and /usr/bin are used to store commonly used executable files such as ls, grep, chmod, etc.

2. Because the `` quotes are command substitution quotes. the shell will execute the command between them and then substitute is ouput in place of `command` as if you had typed it. `date` tries to run a command named whatever date outputs on your system.

3. Its easiest to use three seperate commands. If it takes longer to figure out how to do something in one command than it takes to type 3 and computing resources aren't an issue because you are only going to do it once or you have a tiny amount of data, why waste your time trying to figure out how to make a complex command work?
Code:
cat foo1 > newfile
somecommand >> newfile
cat foo2 >> newfile

4. ${d-*} means if d is unset then assign * to d. see the parameter expansion section of the ksh, sh, or bash man page for more info.

5. yes
why are you doing his homework in full ?
This User Gave Thanks to ghostdog74 For This Post:
Neo
 

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LEARN ABOUT CENTOS

drop_text_search_template

DROP TEXT SEARCH 
TEMPLATE(7)				  PostgreSQL 9.2.7 Documentation			      DROP TEXT SEARCH TEMPLATE(7)

NAME

       DROP_TEXT_SEARCH_TEMPLATE - remove a text search template

SYNOPSIS

       DROP TEXT SEARCH TEMPLATE [ IF EXISTS ] name [ CASCADE | RESTRICT ]

DESCRIPTION

       DROP TEXT SEARCH TEMPLATE drops an existing text search template. You must be a superuser to use this command.

PARAMETERS

       IF EXISTS
	   Do not throw an error if the text search template does not exist. A notice is issued in this case.

       name
	   The name (optionally schema-qualified) of an existing text search template.

       CASCADE
	   Automatically drop objects that depend on the text search template.

       RESTRICT
	   Refuse to drop the text search template if any objects depend on it. This is the default.

EXAMPLES

       Remove the text search template thesaurus:

	   DROP TEXT SEARCH TEMPLATE thesaurus;

       This command will not succeed if there are any existing text search dictionaries that use the template. Add CASCADE to drop such
       dictionaries along with the template.

COMPATIBILITY

       There is no DROP TEXT SEARCH TEMPLATE statement in the SQL standard.

SEE ALSO

       ALTER TEXT SEARCH TEMPLATE (ALTER_TEXT_SEARCH_TEMPLATE(7)), CREATE TEXT SEARCH TEMPLATE (CREATE_TEXT_SEARCH_TEMPLATE(7))

PostgreSQL 9.2.7						    2014-02-17					      DROP TEXT SEARCH TEMPLATE(7)
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