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Top Forums UNIX for Dummies Questions & Answers Replacing values in a column if they equal a certain value Post 302834299 by evelibertine on Thursday 18th of July 2013 04:22:57 PM
Old 07-18-2013
Replacing values in a column if they equal a certain value

Hi,

I have a tab delimited text file where some lines have the string "NA" in the second column. For these lines, I want to replace NA with the value in the first column, the symbol underscore followed by the value in the fourth column. How do I go about doing that? Thanks!

Input:

Code:
1       rs1933024       0       244859  0       2
1       NA      0       608390  0       2
1       rs12565286      0       761153  0       2
1       NA      0       763682  0       2


Output
Code:
1       rs1933024       0       244859  0       2
1       1:608930      0       608390  0       2
1       rs12565286      0       761153  0       2
1       1:763682      0       763682  0       2

Thanks!
 

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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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