using ls -lrt instead of ls Post: 302344075

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Top Forums UNIX for Dummies Questions & Answers using ls -lrt instead of ls Post 302344075 by Corona688 on Friday 14th of August 2009 01:56:13 PM

08-14-2009

Registered User

The -r flag just reverses the sort, it will still have the skip. Since they're being added continuously, I'm assuming they have sequential timestamps, so if you are using GNU ls, try the --sort=time option, which will sort by time instead of filename.

The performance issue is that, if there are thousands of files -- which there probably are -- it crams them all into one shell variable before continuing. This is slow and may even truncate the list if it is too large. Try something like this instead, piping it:

Code:

ls --sort=time $SAPRESPONSEGOFILE | sed "s/go/dat/g" |
while read SAPRESPONSEFILES
do
  echo "File is ${SAPRESPONSEFILES}"
done

If the performance is too slow you could use shell string manipulation to replace go with dat and leave out sed.

If there are still performance issues with ls, then your directory is too huge, the problem is not ls in particular but rather the rapid statting and sorting of thousands of files in general.

Corona688

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LEARN ABOUT MINIX

sort

SORT(1) 						      General Commands Manual							   SORT(1)

NAME

       sort - sort a file of ASCII lines

SYNOPSIS

       sort [-bcdfimnru] [-tc]	[-o name] [+pos1] [-pos2] file ...

OPTIONS

       -b     Skip leading blanks when making comparisons

       -c     Check to see if a file is sorted

       -d     Dictionary order: ignore punctuation

       -f     Fold upper case onto lower case

       -i     Ignore nonASCII characters

       -m     Merge presorted files

       -n     Numeric sort order

       -o     Next argument is output file

       -r     Reverse the sort order

       -t     Following character is field separator

       -u     Unique mode (delete duplicate lines)

EXAMPLES

       sort -nr file	   # Sort keys numerically, reversed

       sort +2 -4 file	   # Sort using fields 2 and 3 as key

       sort +2 -t: -o out  # Field separator is :

       sort +.3 -.6	   # Characters 3 through 5 form the key

DESCRIPTION

       Sort  sorts  one or more files.	If no files are specified, stdin is sorted.  Output is written on standard output, unless -o is specified.
       The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of	characters  delim-
       ited  by  spaces and tabs, unless a different field delimiter is specified with -t.  Both pos1 and pos2 have the form m.n where m tells the
       number of fields and n tells the number of characters.  Either m or n may be omitted.

SEE ALSO

       comm(1), grep(1), uniq(1).

																	   SORT(1)