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Homework and Emergencies Homework & Coursework Questions Track availability of computers Post 302425582 by pseudocoder on Friday 28th of May 2010 01:48:53 PM
Old 05-28-2010
Quote:
Originally Posted by petel1
i have a question, what does the: -c2 switch do
...
the 2 means two packets transmitted right, what if i type 3 ?
-c count
Stop after sending (and receiving) count ECHO_RESPONSE packets.
If this option is not specified, ping will operate until inter-
rupted. If this option is specified in conjunction with ping
sweeps, each sweep will consist of count packets.

If you type 3, then ping will obviously send 3 echo_response packets.
Simply try to manually run this command and you will immediately know what it does.

Quote:
Originally Posted by petel1
and: >/dev/null ?
It simply prevents all that ping output to be shown on the terminal.
Try to remove it, and you will see the difference.

Quote:
Originally Posted by petel1
how does this: done < "$1" work?
Thats the argument you submit with this script, namely the file with computer names/ip's.
When you run this script like ./script computerlist.txt the $1 will become computerlist.txt
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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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