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Top Forums UNIX for Dummies Questions & Answers Replace space in column with letter for several rows Post 302970628 by Egy on Saturday 9th of April 2016 09:24:43 AM
Old 04-09-2016
Replace space in column with letter for several rows

I have a pbd file, which has the following format:

Code:
TITLE     Protein X
MODEL        1
ATOM      1  N   PRO    24      45.220  71.410  43.810  1.00  0.00            
ATOM      2  H1  PRO    24      45.800  71.310  42.000  1.00  0.00            
TER
ENDMDL

Column 22 is the chain identifier for lines that begin with ATOM. I would like to replace the space in column 22 with the letter A. The actual file has thousands of rows labeled ATOM. An example output is given below:

Code:
TITLE     Protein X
MODEL        1
ATOM      1  N   PRO A  24      45.220  71.410  43.810  1.00  0.00            
ATOM      2  H1  PRO A  24      45.800  71.310  42.000  1.00  0.00            
TER
ENDMDL

Any help is much appreciated.
 

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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
(echo "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. BSD
March 9, 2008 BSD
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