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shell scrips loop a dir

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Top Forums Shell Programming and Scripting shell scrips loop a dir
# 8  
Old 02-16-2010
I think that we forgot xyz.

In the following idea the backslash characters "\" protect the characters "." and "*" from the shell and ensure that they are passed to the find command intact. We don't know how many files we will find in the new directory so we read the list with a "while read" statement to process each hit in turn. Just to follow what is going on we can echo the filename so that if we find an occurance of the string "abc" we know which file it was in.
There are more sophisticated contructs which will only give those files which contain the string but it is important to learn how to place diagnostic messages in your scripts to check what is actually happening.


Code:
find "${NEW_DIR}" -type f -name \*\.xyz -print | while read filename
do
      echo "File we are about to search is: ${filename}"
      grep "abc" "${filename}"
done


The double quotes surrounding any mention of ${filename} ensure that we preserve space characters.



Tip: use the unix "man" pages and anything you can find on the Internet to ensure that you understand any work you may submit. Try variations on a test computer to see what happens.
Footnote: Don't issue a unix "rm" until you know 100% what is going to happen.
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DH_INSTALLDEB(1)						     Debhelper							  DH_INSTALLDEB(1)

NAME

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SYNOPSIS

       dh_installdeb [debhelperoptions]

DESCRIPTION

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FILES

       package.postinst
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	   These maintainer scripts are installed into the DEBIAN directory.

	   Inside the scripts, the token #DEBHELPER# is replaced with shell script snippets generated by other debhelper commands.

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	   These control files are installed into the DEBIAN directory.

	   Note that package.shlibs is only installed in compat level 9 and earlier.  In compat 10, please use dh_makeshlibs(1).

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	   This control file will be installed into the DEBIAN directory.

	   In v3 compatibility mode and higher, all files in the etc/ directory in a package will automatically be flagged as conffiles by this
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       package.maintscript
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	   Example:

	       # Correct
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	       # INCORRECT
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	   In compat 10 or later, any shell metacharacters will be escaped, so arbitrary shell code cannot be inserted here.  For example, a line
	   such as "mv_conffile /etc/oldconffile /etc/newconffile" will insert maintainer script snippets into all maintainer scripts sufficient
	   to move that conffile.

	   It was also the intention to escape shell metacharacters in previous compat levels.	However, it did not work properly and as such it
	   was possible to embed arbitrary shell code in earlier compat levels.

	   The dh_installdeb tool will do some basic validation of some of the commands listed in this file to catch common mistakes.  The
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SEE ALSO

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       This program is a part of debhelper.

AUTHOR

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11.1.6ubuntu2							    2018-05-10							  DH_INSTALLDEB(1)