SED: Place char at starting and replace selected line
Hello Experts,
I am working on a small file editing script. Since all experts here are very generous to give me the complete code, I would take up the problem in steps so that I ensure my opportunity to learn.
AIM: The script has some commented and some uncommented lines. I need to :
Comment and uncomment lines as per requirement
Change some lines, again as per requirement
The requirement is specified by the command line arg
Here is what I have thought of:
Place # in front of all uncommented lines.
edit the required line
Suppose my file f.txt is:
Code:
#qwertyu
asdfgh
#zxcvbnm
qwertyuiop
The desired o/p is:
Code:
#qwertyu
#asdfgh
#zxcvbnm
#qwertyuiop
What I tried:
Code:
sed 's/^/#/g' f.txt > result.txt # first command
sed 's/^[^#]/#/g' f.txt > result.txt # second command
The problem is:
First command places a # in front of each line, not that it's a problem as I am simply concerned with commenting the lines, but I want to know if what I am trying is possible.
Second command replaces the first character too .
Please provide me some ideas to approach this problem.
If you think I am headed in the wrong direction, pls correct me and advise some other way to accomplish my task.
Kindly avoid direct code solutions, hints are most welcome.
Thank You.
Regards,
HKansal
Last edited by hkansal; 04-21-2009 at 10:44 AM..
Reason: corrected typo
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LEARN ABOUT REDHAT
unix2dos
unix2dos(1) General Commands Manual unix2dos(1)NAME
unix2dos - UNIX to DOS text file format converter
SYNOPSYS
unix2dos [options] [-c convmode] [-o file ...] [-n infile outfile ...]
Options:
[-hkqV] [--help] [--keepdate] [--quiet] [--version]
DESCRIPTION
This manual page documents unix2dos, the program that converts text files in UNIX format to DOS format.
OPTIONS
The following options are available:
-h --help
Print online help.
-k --keepdate
Keep the date stamp of output file same as input file.
-q --quiet
Quiet mode. Suppress all warning and messages.
-V --version
Prints version information.
-c --convmode convmode
Sets conversion mode. Simulates unix2dos under SunOS.
-o --oldfile file ...
Old file mode. Convert the file and write output to it. The program default to run in this mode. Wildcard names may be used.
-n --newfile infile outfile ...
New file mode. Convert the infile and write output to outfile. File names must be given in pairs and wildcard names should NOT be
used or you WILL lost your files.
EXAMPLES
Get input from stdin and write output to stdout.
unix2dos
Convert and replace a.txt. Convert and replace b.txt.
unix2dos a.txt b.txt
unix2dos -o a.txt b.txt
Convert and replace a.txt in ASCII conversion mode. Convert and replace b.txt in ISO conversion mode.
unix2dos a.txt -c iso b.txt
unix2dos -c ascii a.txt -c iso b.txt
Convert and replace a.txt while keeping original date stamp.
unix2dos -k a.txt
unix2dos -k -o a.txt
Convert a.txt and write to e.txt.
unix2dos -n a.txt e.txt
Convert a.txt and write to e.txt, keep date stamp of e.txt same as a.txt.
unix2dos -k -n a.txt e.txt
Convert and replace a.txt. Convert b.txt and write to e.txt.
unix2dos a.txt -n b.txt e.txt
unix2dos -o a.txt -n b.txt e.txt
Convert c.txt and write to e.txt. Convert and replace a.txt. Convert and replace b.txt. Convert d.txt and write to f.txt.
unix2dos -n c.txt e.txt -o a.txt b.txt -n d.txt f.txt
DIAGNOSTICS BUGS
The program does not work properly under MSDOS in stdio processing mode. If you know why is that so, please tell me.
AUTHOR
Benjamin Lin - ( blin@socs.uts.edu.au )
MISCELLANY
Tested environment:
Linux 1.2.0 with GNU C 2.5.8
SunOS 4.1.3 with GNU C 2.6.3
MS-DOS 6.20 with Borland C++ 4.02
Suggestions and bug reports are welcome.
SEE ALSO dos2unix(1)1995.03.31 unix2dos v2.2 unix2dos(1)
04-20-2009
SED: Place char at starting and replace selected line
.