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Top Forums Shell Programming and Scripting How to rewrite a line in a file Post 302117416 by c0384 on Monday 14th of May 2007 08:48:18 AM
Old 05-14-2007
Quote:
Originally Posted by aigles
To replace line 2 :
Code:
sed '2c\
200 3000' infile > outfile

With awk:
Code:
awk 'NR==2 {print "200 3000"; next} 1' infile > outfile


Jean-Pierre.
Thanks everyone for valuable suggestions.

I tried both commands suggested by aigles but it doesnt work. I got errors which indicating syntax error if I am not mistaken.
However, Shell Life commands work well.

I wish to extend my questions base on the question I posted the other day.
How about only change the 2nd word on the second line of the file? For example
HELLO
179.390 111.560
HOW TO DO
WHAT TO DO

to become

HELLO
179.390 50000
HOW TO DO
WHAT TO DO
 

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SHAPELIB(1)							   User Commands						       SHAPELIB(1)

NAME
shprewind - fix polygon ring orientations in ESRI shapefiles SYNOPSIS
shprewind infile outfile DESCRIPTION
Makes a copy of the shapefile infile to outfile and fixes the orientation of points in the rings of Polygon, PolygonZ, and PolygonM typed shapes to conform to the shapefile specification. According to the specification, the vertices of outer rings should be oriented clockwise on the X/Y plane, and those of inner rings counterclockwise. Shapefiles actually consist of two files with the same basename and extensions .shp and .shx (or .SHP and .SHX) containing the shape data and shape index respectively. The files to open are determined by first stripping any filename extension from infile and attempting to open the files infile.shp or infile.SHP, and infile.shx or infile.SHX for the respective data and index files. The files to create from outfile are determined by stripping any filename extension from outfile and appending .shp and .shx suffixes for the respective data and index files. EXIT STATUS
0 Successful program execution. 1 Missing infile or outfile arguments, failed to open shapefile infile or create shapefile outfile. DIAGNOSTICS
The following diagnostics may be issued on stdout: Unable to open:infile Unable to create:outfile count objects rewound. AUTHORS
Frank Warmerdam (warmerdam@pobox.com) is the maintainer of the shapelib shapefile library. Joonas Pihlaja (jpihlaja@cc.helsinki.fi) wrote this man page. BUGS
The implementation assumes that there is at most one outer ring in each shape, that it is the first ring in a shape, and all other rings in a shape are inner rings. Polygons inside MultiPatch shape types aren't rewound. SEE ALSO
dbfadd(1), dbfcreate(1), dbfdump(1), dbf_dump(1), shpadd(1), shpcreate(1), shpdump(1) shapelib OCTOBER 2004 SHAPELIB(1)
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