Wildcard search in if loop Post: 302866017

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Top Forums Shell Programming and Scripting Wildcard search in if loop Post 302866017 by rbatte1 on Monday 21st of October 2013 06:09:41 AM

10-21-2013

Moderator

In Bourne shell /bin/sh you will need to extract the heading of the file to test against. The if will only accept a literal value to compare to. You might consider the following:-

Code:

#!/bin/sh
cd /home/practice
for file in abc* ghi* xyz*
 do
   testval="${file%${file##???}}"  
   if [ $file = "$testval" ];
  then
:
:

It might look a bit scary, but what the extra line does is to slice up the string. You could do this with cut but that spawns another process, so it can cost a lot of time if this is in a loop for lots of files.

The % and # markers are then followed by descriptions of how to split the line. The second part ${file##???} cuts the first three characters. It seems odd, but given that is what you want, it is the fed back in to the first part which then excludes everything from the string apart from what was worked out in part 2.

So, for a file name of xyz12345678, part 2 evaluates to 12345678, so part 1 the removes this from the end of the whole file name and you are left with xyz You can then use this in your if statement.

I hope that this helps,
Robin
Liverpool/Blackburn
UK

rbatte1

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LEARN ABOUT OPENDARWIN

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)

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