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Home > Archive > Unix Shell > November 2006 > Deleting a line from a file and replacing a variable
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Deleting a line from a file and replacing a variable
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| Charles A. Landemaine 2006-11-30, 1:33 am |
| Hello, I need to open a file, to search for a line that starts with
lighttpd_enable="YES", to remove this line and to save the file.
Also I need to open another file, to search for "lighttpd-1.4.12"
everywhere in the file (it appears several times), to change this
string to "lighttpd-1.4.13" and to save the file.
How could I do that using sed? I'm using regular Bourne shell on
FreeBSD. Thanks in advance.
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| Chris F.A. Johnson 2006-11-30, 1:33 am |
| On 2006-11-30, Charles A. Landemaine wrote:
> Hello, I need to open a file, to search for a line that starts with
> lighttpd_enable="YES", to remove this line and to save the file.
grep -v '^lighttpd_enable="YES"' FILE > tempfile &&
mv -- tempfile FILE
If there may be more than one instance, and you only want to
remove the first:
awk '/^lighttpd_enable="YES"/ && x++ == 0 { next }
{ print }' FILE > tempfile && mv -- tempfile FILE
> Also I need to open another file, to search for "lighttpd-1.4.12"
> everywhere in the file (it appears several times), to change this
> string to "lighttpd-1.4.13" and to save the file.
>
> How could I do that using sed?
sed 's/lighttpd-1.4.12/lighttpd-1.4.13/g' FILE > tempfile &&
mv -- tempfile FILE
> I'm using regular Bourne shell on FreeBSD.
FreeBSD doesn't have a Bourne shell; /bin/sh is a POSIX shell.
--
Chris F.A. Johnson, author <http://cfaj.freeshell.org/shell>
Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)
===== My code in this post, if any, assumes the POSIX locale
===== and is released under the GNU General Public Licence
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