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Re: [Help-bash] for File in Folder_Variable_Name Expansion

From: Eduardo A . Bustamante López
Subject: Re: [Help-bash] for File in Folder_Variable_Name Expansion
Date: Sun, 15 Dec 2013 20:50:20 -0800
User-agent: Mutt/1.5.21 (2010-09-15)

On Sun, Dec 15, 2013 at 01:28:24PM -0900, Roger wrote:
> $ FOLDER="${HOME}/Books/Learning?C/cse142/Lecture1/Files/slides/"; for file 
> in "${FOLDER}"/*.jpg; do echo "${file}"; done
So you have a directory named "Learning?C" ? Also, did you make sure
that there are actually .jpg files in that directory (not .JPG or
.jpeg, note the extra "e" or the case sensitivity)

> $ FOLDER="${HOME}/Books/Learning?C/cse142/Lecture1/Files/slides/"; 
> FFOLDER="${FOLDER}/*.jpg"; for file in "${FFOLDER}"; do echo "${file}"; done
> Output:
> /home/roger/Books/Learning?C/cse142/Lecture1/Files/slides//*.jpg
> I've read multiple forum posts, and they've all worked around or suggested 
> (or deterred) the usage of eval.  (ie. $(eval echo "${FOLDER}") )
Yep, never use eval unless you are sure of all the corner cases.

> I have some ideas, and of them thinking just declaring the "name" for the 
> "for" command a static value. (ie. "for FILE in /path/to/folder/*.jpeg")
> (Read the Bash Manual and didn't notice any mention of possible problems 
> using a concatenate variable name for "name" for the "for" command.)
No, that pattern (for + glob) is completely normal.

Eduardo Alan Bustamante López

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