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Top Forums Shell Programming and Scripting How to tell UNIX to start from the oldest file? Post 303022464 by jgt on Saturday 1st of September 2018 07:59:42 AM
Old 09-01-2018
Code:
if [ -r job.pid ]
then
     exit 1
fi
echo $$ >job.pid

cd /home/tmp

  ls -rt *.txt | while IFS= read -r i 

do     ffmpeg $what_soever_command$     

sleep 5     

mv "$i" "/home/tmp/junkie/$i"
 done
 rm job.pid

Two other considerations:
If the text file is large, then a file may appear in the list while it is being received, and processed while it is still incomplete.
Remove any job.pid files that exist on system boot up.
 

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STARTPAR(8)						      System Manager's Manual						       STARTPAR(8)

NAME
startpar - start runlevel scripts in parallel SYNOPSIS
startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] [-a arg] prg1 prg2 ... startpar [-p par] [-i iorate] [-t timeout] [-T global_timeout] -M [ boot|start|stop] DESCRIPTION
startpar is used to run multiple run-level scripts in parallel. The degree of parallelism on one CPU can be set with the -p option, the default is full parallelism. An argument to all of the scripts can be provided with the -a option. Processes blocked by pending I/O will cause new process creation to be weighted by the iorate factor 800. To change this factor the option -i can be used to specify another value. The amount weight=(nblockedxiorate)/1000 will be subtracted from the total number of processes which could be started, where nblocked is the number of processes currently blocked by pending I/O. The output of each script is buffered and written when the script exits, so output lines of different scripts won't mix. You can modify this behaviour by setting a timeout. The timeout set with the -t option is used as buffer timeout. If the output buffer of a script is not empty and the last output was timeout seconds ago, startpar will flush the buffer. The -T option timeout works more globally. If no output is printed for more than global_timeout seconds, startpar will flush the buffer of the script with the oldest output. Afterwards it will only print output of this script until it is finished. The -M option switches startpar into a make(1) like behaviour. This option takes three different arguments: boot, start, and stop for reading .depend.boot or .depend.start or .depend.stop respectively in the directory /etc/init.d/. By scanning the boot and runlevel direc- tories in /etc/init.d/ it then executes the appropriate scripts in parallel. FILES
/etc/init.d/.depend.boot /etc/init.d/.depend.start /etc/init.d/.depend.stop SEE ALSO
init(8) insserv(8). COPYRIGHT
2003,2004 SuSE Linux AG, Nuernberg, Germany. 2007 SuSE LINUX Products GmbH, Nuernberg, Germany. AUTHOR
Michael Schroeder <mls@suse.de> Takashi Iwai <tiwai@suse.de> Werner Fink <werner@suse.de> Jun 2003 STARTPAR(8)
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