Run a cronjob only when a file is modified?


 
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# 8  
Old 02-16-2012
This is going to be a bit large to fit in one cron line, it ought to be a script:

Code:
#!/bin/sh

INPUTFILE=/my_dir_name/my_Filename
TMPFILE=/tmp/.lastupdate

if [ -f /tmp/.lastupdate ]
then
        [ $TMPFILE -nt $INPUTFILE ] && exit 0
        read SIZE < $TMPFILE
        NEWSIZE=$(/usr/bin/stat -c %s $INPUTFILE)
        if [ "$NEWSIZE" -lt "$SIZE" ]
        then
                echo "File shrunk!" >&2
                exit 1
        fi        
fi

process_my_data

/usr/bin/stat -c %s $INPUTFILE > $TMPFILE

If you ever wanted to force an update, just delete /tmp/.lastupdate and run the script.
 
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hdf_copy(3)							  util/neo_hdf.h						       hdf_copy(3)

NAME
hdf_copy - copy part of an HDF dataset to another SYNOPSIS
#include <util/neo_hdf.h> NEOERR* hdf_copy (HDF *dest_hdf, const char *name, HDF *src); ARGUMENTS
dest_hdf -> the destination dataset name -> the name of the destination node src -> the hdf dataset to copy to the destination DESCRIPTION
hdf_copy is a deep copy of an HDF tree pointed to by src to the named node of dest. dest and src need not be part of the same data set RETURN VALUE
None SEE ALSO
hdf_set_symlink(3), hdf_get_valuef(3), compareFunc)(3), hdf_dump_str(3), hdf_get_int_value(3), hdf_read_string_ignore(3), hdf_copy(3), hdf_get_node(3), hdf_set_value(3), hdf_obj_child(3), hdf_read_string(3), hdf_set_buf(3), hdf_register_fileload(3), hdf_get_obj(3), hdf_get_attr(3), hdf_obj_top(3), hdf_dump_format(3), hdf_destroy(3), hdf_init(3), hdf_obj_value(3), hdf_write_string(3), hdf_set_val- uevf(3), hdf_sort_obj(3), hdf_write_file_atomic(3), hdf_obj_attr(3), hdf_set_valuef(3), hdf_get_copy(3), hdf_write_file(3), hdf_get_val- uevf(3), hdf_set_int_value(3), hdf_dump(3), hdf_get_value(3), hdf_set_copy(3), hdf_obj_next(3), hdf_search_path(3), hdf_obj_name(3), hdf_set_attr(3), hdf_get_child(3), hdf_remove_tree ClearSilver 12 July 2007 hdf_copy(3)