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Top Forums UNIX for Dummies Questions & Answers Extracting Parts of String "#" vs "%" Post 302954232 by shah9250 on Saturday 5th of September 2015 06:07:08 PM
Old 09-05-2015
Extracting Parts of String "#" vs "%"

Hello,

I have a question regarding extracting parts of a string and the meaning of # and % in the syntax. I created an example below.

Code:
[root@localhost scriptspractice]# filename=/first/second/third/fourth
[root@localhost scriptspractice]# 
[root@localhost scriptspractice]# echo $filename
/first/second/third/fourth
[root@localhost scriptspractice]# 
[root@localhost scriptspractice]# echo "${filename##*/}"
fourth
[root@localhost scriptspractice]# 
[root@localhost scriptspractice]# echo "${filename%/*}"
/first/second/third

In both of these examples , I wanted to: extract only the fourth part of the string and extract everything but the fourth part of the string, which I did successfully. Conceptually, I wanted to know what is the difference between # and % and why do I need ## in the first example as opposed to just #. Why cannot I use # instead of %? Thanks.
 

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SNMP2_WALK(3)								 1							     SNMP2_WALK(3)

snmp2_walk - Fetch all theSNMPobjects from an agent

SYNOPSIS
array snmp2_walk (string $host, string $community, string $object_id, [string $timeout = 1000000], [string $retries = 5]) DESCRIPTION
snmp2_walk(3) function is used to read all the values from an SNMP agent specified by the $hostname. PARAMETERS
o $host - The SNMP agent (server). o $community - The read community. o $object_id - If NULL, $object_id is taken as the root of the SNMP objects tree and all objects under that tree are returned as an array. If $object_id is specified, all the SNMP objects below that $object_id are returned. o $timeout - The number of microseconds until the first timeout. o $retries - The number of times to retry if timeouts occur. RETURN VALUES
Returns an array of SNMP object values starting from the $object_id as root or FALSE on error. EXAMPLES
Example #1 snm2_pwalk(3) Example <?php $a = snmp2_walk("127.0.0.1", "public", ""); foreach ($a as $val) { echo "$val "; } ?> Above function call would return all the SNMP objects from the SNMP agent running on localhost. One can step through the values with a loop SEE ALSO
snmp2_real_walk(3). PHP Documentation Group SNMP2_WALK(3)
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