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Top Forums Shell Programming and Scripting combining columns from different files Post 82981 by iomaire on Friday 9th of September 2005 03:58:07 AM
Old 09-09-2005
Hi again,

I'm sorry I'm not being clear. I've attached a bash script that does what I need but it's messy.
- it assumes that all files with a certain name pattern in a directory are to be included
- the column to extract is hard-coded as I couldn't pass it to awk within the script

Scenario: each file is the result of an experiment. Each column is a particular value measured in the experiment. Each row is the index of the measurement taken.
I want to a create summary file across all experiment result files such that a summary file joins a given colum from each experiment file.

Example problem:
File_A.dat
#################
# Comments
# Header
#################
1 val_A12 val_A13
2 val_A22 val_A23
3 val_A32 val_A33

File_B.dat
#################
# Comments
# Header
#################
1 val_B12 val_B13
2 val_B22 val_B23
3 val_B32 val_B33

Files might have up to 2500 rows and 30 columns.

Want to pass to a script 'Give me all column 2's from File_A.dat File_B.dat ... File_30.dat

Desired result file (for column 2's):
Result.dat:
1 val_A12 val_B12
2 val_A22 val_B22
2 val_A32 val_B32
etc

Like I say, my script does the job but hopefully you can think of a neater way to do this.

Regards,
Éanna
 

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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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