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Full Discussion: Delete a line from a file
Top Forums UNIX for Dummies Questions & Answers Delete a line from a file Post 302274227 by shabs1985 on Wednesday 7th of January 2009 04:37:22 AM
Old 01-07-2009
Question

Quote:
Originally Posted by palanisvr
Try this :

##--NOn interactive deletion of lines using vi- editor
vi - a.txt <<END
:11d
:12d
:x
END

##the above code will delete 11th and 42nd line , saves the file and exits

dump the above code in a script and execute it ...

you can also achive the same using sed but sed is a temporary one it wont make the changes permanent to the source file....
thats fine. how do i do it in sed, i could pipe the changes into a new file. i prefer single line commands as i haven't mastered executing scripts yet.
 

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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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