Hi,
I'm using AWK to try to extract data from multiple files (*.txt). The script should look for a flag that occurs at a specific position in each file and it should return the data to the right of that flag.
I should end up with one line for each file, each containing 3 columns:
Filename1.txt Data1 MoreData1
Filename2.txt Data2 MoreData2
Filename3.txt Data3 MoreData3
The trouble is, my output seems to be as follows:
Filename1.txt
Filename2.txt Data1 MoreData1
Filename3.txt Data2 MoreData2
I'm not sure what I've done wrong because I'm still struggling with the syntax and structure of AWK. Any idea what is wrong?
I'm very new to UNIX, AWK, etc. so simple language would be appreciated (if possible).
Thanks
Here's the code I have, it's in a file called "extract_data_from_files.awk":
Code:
#!/usr/bin/awk
BEGIN {
print "Starting script...";
}
{
if ( substr($0,2,3) == "UWI") # substr(s, a, b) and returns b number of
# chars from string s, starting at position a.
{
well = substr($0,11,20);
gsub(/^[ \t]+|[ \t]+$/, "", well); #trim spaces
}
if ( substr($0,2,3) == "LSR")
{
kb = substr($0,11,20);
gsub(/^[ \t]+|[ \t]+$/, "", kb); #trim spaces
}
if ( FNR == 1 || EOF ) #FNR=total lines in each file. EOF=End Of File
{
concat = FILENAME "\t\t\t" well "\t\t\t" kb; #no commas needed to separate variables
print concat;
}
}
END {
print "Ending script...";
}
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tracker-extract(1) User Commands tracker-extract(1)NAME
tracker-extract - Extract metadata from a file.
SYNOPSYS
tracker-extract [OPTION...] FILE...
DESCRIPTION
tracker-extract reads the file and mimetype provided in stdin and extract the metadata from this file; then it displays the metadata on the
standard output.
NOTE: If a FILE is not provided then tracker-extract will run for 30 seconds waiting for DBus calls before quitting.
OPTIONS
-?, --help
Show summary of options.
-v, --verbosity=N
Set verbosity to N. This overrides the config value. Values include 0=errors, 1=minimal, 2=detailed and 3=debug.
-f, --file=FILE
The FILE to extract metadata from. The FILE argument can be either a local path or a URI. It also does not have to be an absolute
path.
-m, --mime=MIME
The MIME type to use for the file. If one is not provided, it will be guessed automatically.
-d, --disable-shutdown
Disable shutting down after 30 seconds of inactivity.
-i, --force-internal-extractors
Use this option to force internal extractors over 3rd parties like libstreamanalyzer.
-m, --force-module=MODULE
Force a particular module to be used. This is here as a convenience for developers wanting to test their MODULE file. Only the MOD-
ULE name has to be specified, not the full path. Typically, a MODULE is installed to /usr/lib/tracker-0.7/extract-modules/. This
option can be used with or without the .so part of the name too, for example, you can use --force-module=foo
Modules are shared objects which are dynamically loaded at run time. These files must have the .so suffix to be loaded and must con-
tain the correct symbols to be authenticated by tracker-extract. For more information see the libtracker-extract reference documen-
tation.
-V, --version
Show binary version.
EXAMPLES
Using command line to extract metadata from a file:
$ tracker-extract -v 3 -f /path/to/some/file.mp3
Using a specific module to extract metadata from a file:
$ tracker-extract -v 3 -f /path/to/some/file.mp3 -m mymodule
ENVIRONMENT
TRACKER_EXTRACTORS_DIR
This is the directory which tracker uses to load the shared libraries from (used for extracting metadata for specific file types).
These are needed on each invocation of tracker-store. If unset it will default to the correct place. This is used mainly for testing
purposes. The default location is /usr/lib/tracker-0.10/extract-modules/.
TRACKER_EXTRACTOR_RULES_DIR
This is the directory which tracker uses to load the rules files from. The rules files describe extractor modules and their sup-
ported MIME types. The default location is /usr/share/tracker/extract-rules/.
TRACKER_USE_CONFIG_FILES
Don't use GSettings, instead use a config file similar to how settings were saved in 0.10.x. That is, a file which is much like an
.ini file. These are saved to $HOME/.config/tracker/
SEE ALSO tracker-store(1), tracker-sparql(1), tracker-stats(1), tracker-info(1).
/usr/lib/tracker-0.10/extract-modules/
/usr/share/tracker/extract-rules/
GNU July 2007 tracker-extract(1)
09-28-2010
).