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Top Forums Shell Programming and Scripting UNIX cmd -find empty files in folder else sleep for 8hrs Post 302935066 by DGPickett on Thursday 12th of February 2015 01:53:54 PM
Old 02-12-2015
Also, you can stop at the first file; use 'read' or 'line' to detect the first line. Be careful of read, as "| read x' in ksh is fine, but in bash, read runs in an implicit subshell and x is not set for your shell, so try explicit subshell in which you test x: '|( read x ; . . . .)'. While 'line' is not a built-in (if you have it at all), it is good at expediting data out of a pipe, where one byte reads are given special treatment, do not block awaiting a bull buffer, and it returns 1 to $? on EOF.

Last edited by DGPickett; 02-12-2015 at 03:07 PM..
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line(1)                                                            User Commands                                                           line(1)

NAME
line - read one line SYNOPSIS
line DESCRIPTION
The line utility copies one line (up to and including a new-line) from the standard input and writes it on the standard output. It returns an exit status of 1 on EOF and always prints at least a new-line. It is often used within shell files to read from the user's terminal. EXIT STATUS
Exit status is: 0 Successful completion >0 End-of-file on input. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), read(2), attributes(5) SunOS 5.10 1 Feb 1995 line(1)
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