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Top Forums Shell Programming and Scripting delete lines with empty second column Post 302503861 by bsco on Saturday 12th of March 2011 03:53:13 AM
Old 03-12-2011
Java delete lines with empty second column

hi,
I'd like to ask you if you can help me with such surely easy thing - I have some data and need to plot them. I have txt of data in two columns, tab separated, but some second columns are empty. like
Code:
1````       2
1.2`` 
3````       2
4.44` 
5`````
6.1```1

how can I erase all the lines with the second empty column? (2nd, 4th, 5th) The lenght of numbers in the first column varies.
the second column is initiated by tab despite its emptyness.
thank you!

Last edited by radoulov; 03-12-2011 at 05:35 AM.. Reason: Code tags, please!
 

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PR(1)							      General Commands Manual							     PR(1)

NAME
pr - print file SYNOPSIS
pr [ option ... ] [ file ... ] DESCRIPTION
Pr produces a printed listing of one or more files on its standard output. The output is separated into pages headed by a date, the name of the file or a specified header, and the page number. With no file arguments, pr prints its standard input. Options apply to all following files but may be reset between files: -n Produce n-column output. +n Begin printing with page n. -b Balance columns on last page, in case of multi-column output. -d Double space. -en Set the tab stops for input text every n spaces. -h Take the next argument as a page header (file by default). -in Replace sequences of blanks in the output by tabs, using tab stops set every n spaces. -f Use formfeeds to separate pages. -ln Take the length of the page to be n lines instead of the default 66. -m Print all files simultaneously, each in one column. -n Number the lines of each file. -on Offset the left margin n character positions. -sc Separate columns by the single character c instead of aligning them with white space. A missing c is taken to be a tab. -t Do not print the 5-line header or the 5-line trailer normally supplied for each page. -wn For multi-column output, take the width of the page to be n characters instead of the default 72. SOURCE
/sys/src/cmd/pr.c SEE ALSO
cat(1), lp(1) PR(1)
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