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Top Forums UNIX for Dummies Questions & Answers print columns of a file in a for loop Post 302581422 by FelipeAd on Tuesday 13th of December 2011 06:44:25 AM
Old 12-13-2011
print columns of a file in a for loop

Hello,
I have a file with 32 columns and I want to print one column at a time, and then read each line of this column in order to use grep command.
I tried with awk but i cannot put variable in awk

Code:
for a in {1..32..1};do awk '{print$a}' file1.txt|while read line;do grep $line file2.txt;done > file3.txt;done

 

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COLUMN(1)						    BSD General Commands Manual 						 COLUMN(1)

NAME
column -- columnate lists SYNOPSIS
column [-tx] [-c columns] [-s sep] [file ...] DESCRIPTION
The column utility formats its input into multiple columns. Rows are filled before columns. Input is taken from file operands, or, by default, from the standard input. Empty lines are ignored. The options are as follows: -c Output is formatted for a display columns wide. -s Specify a set of characters to be used to delimit columns for the -t option. -t Determine the number of columns the input contains and create a table. Columns are delimited with whitespace, by default, or with the characters supplied using the -s option. Useful for pretty-printing displays. -x Fill columns before filling rows. Column exits 0 on success, >0 if an error occurred. ENVIRONMENT
COLUMNS The environment variable COLUMNS is used to determine the size of the screen if no other information is available. EXAMPLES
(printf "PERM LINKS OWNER GROUP SIZE MONTH DAY HH:MM/YEAR NAME " ; ls -l | sed 1d) | column -t SEE ALSO
colrm(1), ls(1), paste(1), sort(1) HISTORY
The column command appeared in 4.3BSD-Reno. AVAILABILITY
The column command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. BSD
June 6, 1993 BSD
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