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Home > Archive > Unix Programming > April 2006 > add a character to a line...
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add a character to a line...
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| onlineviewer 2006-04-27, 1:28 pm |
| Hello,
How do you add a word or a character to the beginning of a line in a
file? I want to add a comment '#' where the string 'var' appears in a
file, globally. Like:
#### before:
bla
Var
bla
#### after:
bla
#Var
bla
Thanks,,,
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| Maxim Yegorushkin 2006-04-27, 1:28 pm |
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onlineviewer wrote:
> Hello,
>
> How do you add a word or a character to the beginning of a line in a
> file? I want to add a comment '#' where the string 'var' appears in a
> file, globally. Like:
>
> #### before:
> bla
> Var
> bla
>
> #### after:
> bla
> #Var
> bla
>
> Thanks,,,
in emacs
or using awk:
awk '/Var/{print #Var}' <file>
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| Chris F.A. Johnson 2006-04-27, 7:25 pm |
| On 2006-04-27, onlineviewer wrote:
> Hello,
>
> How do you add a word or a character to the beginning of a line in a
> file? I want to add a comment '#' where the string 'var' appears in a
> file, globally. Like:
>
> #### before:
> bla
> Var
> bla
>
> #### after:
> bla
> #Var
> bla
Do you want to add it before (a) 'var' or before (b) 'Var' or
before (c) both?
sed '/var/ s/^/#/' ## a
sed '/Var/ s/^/#/' ## b
sed '/[Vv]ar/ s/^/#/' ## c
Does var have to be a complete word? If so, you'll have to add
that.
--
Chris F.A. Johnson, author <http://cfaj.freeshell.org>
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, is written for the POSIX locale
===== and is released under the GNU General Public Licence
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| onlineviewer 2006-04-27, 7:25 pm |
| awesome,,,
thanks,
| |
| Jim Cochrane 2006-04-27, 7:25 pm |
| On 2006-04-27, onlineviewer <lancerset@gmail.com> wrote:
> Hello,
>
> How do you add a word or a character to the beginning of a line in a
> file? I want to add a comment '#' where the string 'var' appears in a
> file, globally. Like:
>
> #### before:
> bla
> Var
> bla
>
> #### after:
> bla
> #Var
> bla
>
> Thanks,,,
>
To change the file directly, you can use ed (or ex):
# On every line where var or Var occurs as a word (e.g., exclude
# "variety"), add '#' to the beginning of the line:
echo 'g/\<[vV]ar\>/s/^/#/
wq'|ed file
It's easy to put this in a for loop to process several files.
--
*** Posted via a free Usenet account from http://www.teranews.com ***
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| onlineviewer 2006-04-28, 1:16 pm |
| thank you
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