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Full Discussion: How to check that passed parameters all have the same extension?
Top Forums Shell Programming and Scripting How to check that passed parameters all have the same extension? Post 302411063 by alister on Wednesday 7th of April 2010 01:02:18 PM
Old 04-07-2010
The following is a sh solution that should be portable to most reasonably posix-compliant shells, and which should use nothing but sh built-ins to do its job.

With 0 or 1 argument, the result is always a match. With two or more, all extensions must match. The extension for "file.1.2" is ".1.2" and not ".2". All filenames with absent extensions match each other (which is the same semantic as that used by the echo|sed|uniq|wc pipeline in your earlier solution).

e=extension of current filename
set_e=function to set e
ext=extension which all filenames must match
f=current filename
Code:
#!/bin/sh

set_e() {
    e=${1#*.}
    [ "$e" = "$1" ] && e=''
}

set_e "$1"
ext=$e

for f; do
    set_e "$f"
    [ "$ext" = "$e" ] || exit 1
done
exit 0

You can then use the exit status to echo or proceed accordingly (or you can just insert the echo statements into the code, if you like).

Regards,
Alister
Last edited by alister; 04-07-2010 at 03:36 PM.. Reason: removed shift
 

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LEARN ABOUT XFREE86

xdpyinfo

XDPYINFO(1)						      General Commands Manual						       XDPYINFO(1)

NAME

       xdpyinfo - display information utility for X

SYNOPSIS

       xdpyinfo [-display displayname] [-queryExtensions] [-ext extension-name]

DESCRIPTION

       Xdpyinfo  is  a	utility  for displaying information about an X server.	It is used to examine the capabilities of a server, the predefined
       values for various parameters used in communicating between clients and the server, and the different types of screens and visuals that are
       available.

       By  default,  numeric  information  (opcode,  base  event, base error) about protocol extensions is not displayed.  This information can be
       obtained with the -queryExtensions option.  Use of this option on servers that dynamically load extensions will likely cause  all  possible
       extensions to be loaded, which can be slow and can consume significant server resources.

       Detailed  information  about  a particular extension is displayed with the -ext extensionName option.  If extensionName is all, information
       about all extensions supported by both xdpyinfo and the server is displayed.

ENVIRONMENT

       DISPLAY To get the default host, display number, and screen.

SEE ALSO

       X(7), xwininfo(1), xprop(1), xrdb(1)

AUTHOR

       Jim Fulton, MIT X Consortium
       Support for the XFree86-VidModeExtension, XFree86-DGA, XFree86-Misc, and XKB extensions added by Joe Moss

XFree86 							   Version 4.7.0						       XDPYINFO(1)
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