09-19-2011
Extracting rows from a text file based on the first column
I have a tab delimited text file where the first column can take on three different values : 100, 150, 250. I want to extract all the rows where the first column is 100 and put them into a separate text file and so on. This is what my text file looks like now:
100 rs3794811 0.01 0.3434
100 rs8066551 0.01 0.4541
100 rs7215271 0.02 0.2592
100 rs6565733 0.00 0.8408
150 rs1106175 0.00 0.5562
150 rs8064924 0.00 0.8014
150 rs7224313 0.03 0.1484
150 rs7217319 0.02 0.2413
150 rs4890199 0.02 0.2033
150 rs4890183 0.03 0.1351
250 rs4424950 0.02 0.1715
250 rs7503116 0.03 0.1474
250 rs1136388 0.04 0.0801
250 rs1609550 0.02 0.2784
250 rs11654695 0.01 0.4495
250 rs11649979 0.01 0.4060
250 rs12938802 0.00 0.5404
250 rs1138504 0.01 0.3606
How do I go about doing that? Thanks!
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LEARN ABOUT OPENDARWIN
column
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.
DIAGNOSTICS
The column utility exits 0 on success, and >0 if an error occurs.
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 " ;
printf "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.
BSD
June 6, 1993 BSD