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Full Discussion: Prefix/Suffix on same file
Top Forums UNIX for Advanced & Expert Users Prefix/Suffix on same file Post 302943034 by neutronscott on Monday 4th of May 2015 08:27:16 PM
Old 05-04-2015
sed and awk are stream editors. they can read files, but they don't really write them. some sed's have a -i option for in place editing, but it's somewhat broken and isn't portable.
you can use either and write to a new file, and then if that works, move it over the intended file.

Code:
awk 'NR==205 { print "prefix" $0 "suffix"; };1' file > newfile.$$ && mv newfile.$$ file

or use ed, which is a standard line-oriented file editor
Code:
printf '%s\n' '205s/.*/prefix&suffix/' w | ed -s file
    # or as a here-doc:
ed -s file <<!
205s/.*/prefix&suffix/
w
!

 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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