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 SUSE

sem_close

SEM_CLOSE(3)						     Linux Programmer's Manual						      SEM_CLOSE(3)

NAME

       sem_close - close a named semaphore

SYNOPSIS

       #include <semaphore.h>

       int sem_close(sem_t *sem);

       Link with -lrt or -pthread.

DESCRIPTION

       sem_close()  closes the named semaphore referred to by sem, allowing any resources that the system has allocated to the calling process for
       this semaphore to be freed.

RETURN VALUE

       On success sem_close() returns 0; on error, -1 is returned, with errno set to indicate the error.

ERRORS

       EINVAL sem is not a valid semaphore.

CONFORMING TO

       POSIX.1-2001.

NOTES

       All open named semaphores are automatically closed on process termination, or upon execve(2).

SEE ALSO

       sem_getvalue(3), sem_open(3), sem_post(3), sem_unlink(3), sem_wait(3), sem_overview(7)

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2006-03-25							      SEM_CLOSE(3)