In a file, replace blank line by the last line not blank above
Dear All,
In a CSV file, say that a given column has been extracted. In that column, information is missing (i.e. blank lines appear). I would like to replace the blank lines by the last valid line (not blank) previously read.
For example, consider the extract below:
Code:
123
234
543
111
234
198
I would like this extract to be replaced by:
Code:
123
234
234
543
543
543
111
234
234
234
198
198
I wrote a simple script to do the job that reads myfile.txt and writes the result in out.txt:
Code:
MEMVAL=""
LINENUM=0
while read LINE
do
LINENUM=$(($LINENUM+1));
# Test if the line is blank
CURLINE=`echo $LINE | grep -E '^[:space]*$'`
TEST="$?"
if [ $TEST == 0 ]; then
if [ $LINENUM == 1 ]; then # The first line cannot be blank!!
exit 1
else
# Replace current blank line by memorised info in the output data file
echo "$MEMVAL" >> out.txt
fi
else
MEMVAL="$LINE"
# At first init output data file
if [ $LINENUM == 1 ]; then
echo "$LINE" > out.txt
fi
fi
done < myfile.txt
This script does the job, but it takes ages.
Also I guess there are far more efficient ways to do this by using either sed of awk (maybe csvfix in my case).
Would anybody have a suggestion?
Cheers, Bagvian
Moderator's Comments:
Please use CODE tags as required by forum rules!
Last edited by RudiC; 02-24-2017 at 03:56 PM..
Reason: Added CODE tags.
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Hi
I nned cmd to which will help me to replace a line in file with blank line
e.g.
file1
a
b
c
d
e
after running cmd I shud get
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b
c
d
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Can you guys help me out?
Regards,
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GAPPLETVIEWER(1) GNU GAPPLETVIEWER(1)NAME
gappletviewer - Load and runs an applet
SYNOPSIS
appletviewer [OPTION]... URL...
appletviewer [OPTION]... -code CODE
appletviewer [OPTION]... -plugin INPUT,OUTPUT
DESCRIPTION
The appletviewer tool loads and runs an applet.
Use the first form to test applets specified by tag. The URL should resolve to an HTML document from which the appletviewer will extract
applet tags. The APPLET, EMBED and OBJECT tags are supported. If a given document contains multiple applet tags, all the applets will be
loaded, with each applet appearing in its own window. Likewise, when multiple URLs are specified, each applet tag instance is given its
own window. If a given document contains no recognized tags the appletviewer does nothing.
appletviewer http://www.gnu.org/software/classpath/
Use the second form to test an applet in development. This form allows applet tag attributes to be supplied on the command line. Only one
applet may be specified using the -code option. The -code option overrides the URL form -- any URLs specified will be ignored.
appletviewer -code Test.class -param datafile,data.txt
gcjwebplugin uses the third form to communicate with the appletviewer through named pipes.
OPTIONS
URL OPTIONS
-debug
This option is not yet implemented but is provided for compatibility.
-encoding CHARSET
Use this option to specify an alternate character encoding for the specified HTML page.
APPLET TAG OPTIONS
-code CODE
Use the -code option to specify the value of the applet tag CODE attribute.
-codebase CODEBASE
Use the -codebase option to specify the value of the applet tag CODEBASE attribute.
-archive ARCHIVE
Use the -archive option to specify the value of the applet tag ARCHIVE attribute.
-width WIDTH
Use the -width option to specify the value of the applet tag WIDTH attribute.
-height HEIGHT
Use the -height option to specify the value of the applet tag HEIGHT attribute.
-param NAME,VALUE
Use the -param option to specify values for the NAME and VALUE attributes of an applet PARAM tag.
PLUGIN OPTION
-plugin INPUT,OUTPUT
gcjwebplugin uses the -plugin option to specify the named pipe the appletviewer should use for receiving commands (INPUT) and the one
it should use for sending commands to gcjwebplugin (OUTPUT).
DEBUGGING OPTION
-verbose
Use the -verbose option to have the appletviewer print debugging messages.
STANDARD OPTIONS
-help
Use the -help option to have the appletviewer print a usage message, then exit.
-version
Use the -version option to have the appletviewer print its version, then exit.
-JOPTION
Use the -J option to pass OPTION to the virtual machine that will run the appletviewer. Unlike other options, there must not be a
space between the -J and OPTION.
BUGS SEE ALSO AUTHOR 0.98 2010-07-05 GAPPLETVIEWER(1)
02-24-2017
