File globbing order Post: 303028636

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Top Forums Shell Programming and Scripting File globbing order Post 303028636 by bakunin on Friday 11th of January 2019 03:41:04 PM

01-11-2019

Registered User

Quote:

Originally Posted by poova

Code:

#get the file name#
file1=$1
file2=$2
rm $file1 # delete the old file
mv $file2 <target path> #move the new file to the target path

execution syntax for FileRemove.sh in my program: sh FileRemove.sh XYZ*.txt

But nowadays $2 getting passed as old file and $1 getting passed as new file. Because of this I'm deleting my new file in script instead of old file.

First: what should the script do if the glob you use does not evaluate to exactly two files?

But supposing it does, if you want to sort according to time and not according to name then use the -tr (sort for time, reversed order) of ls and sort your arguments according to this, regardless of which position they arrive at. Notice that it does pay to build at least a modicum of error-checking into your code (i know, you haven't asked about that, but it still is a good idea.):

Code:

#! /bin/ksh

file1=$(ls -tr $* | head -n 1)
file2=$(ls -tr $* | tail -n 1)

if ! rm $file1 ; then
     print -u2 - "Error deleting $file1"
     exit 1
fi
if ! mv $file2 <target path> ; then
     print -u2 - "Error moving $file2"
     exit 2
fi
exit 0

Just in case you don't use Korn shell: you should have said which shell you use. The translation of this to any other shell is left as an exercise to the reader.

I hope this helps.

bakunin

Last edited by bakunin; 01-12-2019 at 07:21 AM.. Reason: corrected an error, thanks to RudiC for the catch

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diff3

diff3(1)						      General Commands Manual							  diff3(1)

Name
       diff3 - 3-way differential file comparison

Syntax
       diff3 [-ex3] file1 file2 file3

Description
       The command compares three versions of a file, and publishes the ranges of text that disagree, flagged with the following codes:

	  ====	      all three files differ

	  ====1       file1 is different

	  ====2       file2 is different

	  ====3       file3 is different

       The type of change needed to convert a given range of a given file to some other is indicated in one of these ways:

	  f : n1 a    Text is to be appended after line number n1 in file f, where f = 1, 2, or 3.

	  f : n1 , n2 c
		      Text is to be changed in the range line n1 to line n2.  If n1 = n2, the range may be abbreviated to n1.

       The original contents of the range follows immediately after a c indication.  When the contents of two files are identical, the contents of
       the lower-numbered file is suppressed.

Options
       -3   Produces an editor script containing the changes between file1 and file2 that are to be incorporated into file3.

       -e	   Produces an editor script containing the changes between file2 and file3 that are to be incorporated into file1.

       -x	   Produces an editor script containing the changes among all three files.

Examples
       Under the -e option, publishes a script for the editor that incorporates into file1 all changes between file2 and  file3  -  that  is,  the
       changes	that would normally be flagged ==== and ====3.	Option -x (-3) produces a script to incorporate only changes flagged ==== (====3).
       The following command applies the resulting script to `file1':
       (cat script; echo '1,$p') | ed - file1

Restrictions
       Text lines that consist of a single `.'	defeat -e.

Files
       /tmp/d3?????
       /usr/lib/diff3

See Also
       cmp(1), comm(1), diff(1), dffmk(1), join(1), sccsdiff(1), uniq(1)

																	  diff3(1)

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