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Top Forums Shell Programming and Scripting Extract a string up to the first occurence of a substring Post 302379792 by kirkg on Saturday 12th of December 2009 09:23:06 AM
Old 12-12-2009
Extract a string up to the first occurence of a substring

Hi,

I'm a newbie to shell scripting and have searched the forum but couldn't find what i was looking for.

Basically I have a list of filenames like...
123-fileone.txt

I want to be able to extract the prefix up to the first '-'. So I'd end up with 123. I have attempted it using a pretty basic regex ({F%-*}) but that trips up when there is more than 1 occurrence of '-' in the filename, which there can be.

I'm sure it's a simple thing to do...just not for me Smilie

Thanks.

Kirk.
 

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orber_acl(3erl) 					     Erlang Module Definition						   orber_acl(3erl)

NAME
orber_acl - Orber ACL operations DESCRIPTION
This module contains functions intended for analyzing Access Control List (ACL) filters. The filters uses a extended format of Classless Inter Domain Routing (CIDR). For example, "123.123.123.10" limits the connection to that particular host, while "123.123.123.10/17" allows connections to or from any host equal to the 17 most significant bits. Orber also allow the user to specify a certain port or port range, for example, "123.123.123.10/17#4001" and "123.123.123.10/17#4001/5001" respectively. IPv4 or none compressed IPv6 strings are accepted. EXPORTS
match(IP, Direction) -> boolean() match(IP, Direction, GetInfo) -> Reply Types IP = tuple() | [integer()] Direction = tcp_in | ssl_in | tcp_out | ssl_out GetInfo = boolean() Reply = boolean() | {boolean(), [Interface], PortInfo} Interface = string() PortInfo = integer() | {integer(), integer()} If GetInfo is not supplied or set to false, this operation returns a boolean which tells if the IPv4 or IPv6 address would pass the ACL filter, defined by the iiop_acl configuration parameter, or not. When GetInfo is set to true, a tuple which, besides the boolean that tells if access was granted, also include the defined interfaces and port(s). This operation requires that Orber is running and can be used on a live node to determine if Orber has been properly configured. verify(IP, Filter, Family) -> Reply Types IP = string() Filter = string() Family = inet | inet6 Reply = true | {false, From, To} | {error, string()} From = string() To = string() This operation returns true if the IPv4 or IPv6 address would pass the supplied ACL. If that is not the case, a tuple containing the accepted range is returned. This operation should only be used for test purposes. range(Filter, Family) -> Reply Types Filter = string() Family = inet | inet6 Reply = {ok, From, To} | {error, string()} From = string() To = string() Returns the range of accepted IP addresses based on the supplied filter. This operation should only be used for test purposes. Ericsson AB orber 3.6.20 orber_acl(3erl)
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