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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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ED(1)							      General Commands Manual							     ED(1)

NAME
ed - editor SYNOPSIS
ed file OPTIONS
- Suppress line/byte count messages (for in scripts) EXAMPLES
ed prog.c # Edit prog.c echo '1,$p' | ed - file # Odd way to write 'cat file' DESCRIPTION
Ed is functionally equivalent to the standard V7 editor, ed. It supports the following commands: (.) a: append (.,.)c: change (.,.)d: delete e: edit new file" f: print name of edited file" (1,$)g: global command (.) i: insert (.,.+1)j: join lines together (.) k: mark (.) l: print with special characters in octal (.,.)m: move (.,.)p: print q: quit editor" (.) r: read in new file (.,.)s: substitute (1,$)v: like g, except select lines that do not match (1,$)w: write out edited file Many of the commands can take one or two addresses, as indicated above. The defaults are shown in parentheses. Thus a appends to the cur- rent line, and g works on the whole file as default. The dot refers to the current line. Below is a sample editing session with comments given following the # symbol. ed prog.c # Edit prog.c 3,20p # Print lines 3 through 20 /whole/ # Find next occurence of whole s/whole/while/ # Replace whole by while g/Buf/s//BUF/g # Replace Buf by BUF everywhere w # Write the file back q # Exit the editor Ed is provided for its sentimental value. If you want a line-oriented editor, try ex. If you want a good editor, use elle, elvis, or mined. SEE ALSO
elvis(1), elle(9), mined(9). ED(1)
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