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Top Forums Shell Programming and Scripting Script that waits until a call is done Post 302346547 by KenJackson on Saturday 22nd of August 2009 10:29:46 PM
Old 08-22-2009
Are you using Linux? If so, you can install the inotify-tools package (project page). Then call inotifywait with appropriate switches and the file or directory name. It sleeps until there is a file event and then wakes up.

That's much better than polling.
 

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INOTIFY_RM_WATCH(2)					     Linux Programmer's Manual					       INOTIFY_RM_WATCH(2)

NAME
inotify_rm_watch - remove an existing watch from an inotify instance SYNOPSIS
#include <sys/inotify.h> int inotify_rm_watch(int fd, int wd); DESCRIPTION
inotify_rm_watch() removes the watch associated with the watch descriptor wd from the inotify instance associated with the file descriptor fd. Removing a watch causes an IN_IGNORED event to be generated for this watch descriptor. (See inotify(7).) RETURN VALUE
On success, inotify_rm_watch() returns zero. On error, -1 is returned and errno is set to indicate the cause of the error. ERRORS
EBADF fd is not a valid file descriptor. EINVAL The watch descriptor wd is not valid; or fd is not an inotify file descriptor. VERSIONS
Inotify was merged into the 2.6.13 Linux kernel. CONFORMING TO
This system call is Linux-specific. SEE ALSO
inotify_add_watch(2), inotify_init(2), inotify(7) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2017-09-15 INOTIFY_RM_WATCH(2)
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