How i can delete one line in all my files?

[Francesco_13]

Hi,

i'm do it to delete all the characters that are delimited by: /* any character */, in all my text files .How i can do it?
I'm in HP-UX .

Thanks.
Best regards.

[Simon Hargrave · Accepted solution]

To do one file (and to test the pattern), open it up in vi and run the substitution: -

%s/\/\*.*\*\///g

When you're happy it works, use "ed" to run this against all your files: -

for FILE in *.txt
do
ed $FILE <1,\$s/\/\*.*\*\///g
w
q
EOF
done

(note the escaped $, this is so the shell doesn't interpret it)

This will remove everything between /* and */ on a line.

Note that this won't remove multi-line comments, but then your subject implies one line so I assumed this to be your requirement.

[Peter Godron]

Francesco,
please have a look at:
http://sed.sourceforge.net/grabbag/scripts/

Section: Beautifiers

[H.Merijn Brand (procura]

When you want to do that reliable all by your self, you are bound to get stuck somewhere. Some possible problems

1. Comments that cross lines:

/* Comment
* blah
*
*/

2. Comments that look like to be terminated

/* Don't do \*/ that here */

3. Other strangenesses

a = b*/*/*/*3/*/*/*3;

4. Unicode

/*ï¼ *â *â *ï¼ */

(contains 0uff0a 0u2215 and 0u2044)

If you use perl and install Regexp::Common, you can use Regexp::Common::comment, which should be safe for all of the above
http://search.cpan.org/~abigail/Regexp-Common-2.120/
http://search.cpan.org/~abigail/Regexp-Common-2.120/lib/Regexp/Common/comment.pm


use Regexp::Common qw(comment);

while (<>) {
/$RE{comment}{C}/ and print "Contains a C comment\n";
}

use Regexp::Common qw(comment RE_comment_C);

while (<>) {
$_ =~ RE_comment_C () and print "Contains an C comment\n";
}

Enjoy, Have FUN! H.Merijn

[Ralph Grothe]

Hi,

as procura brought Perl into play,
the removal of C comments seems such a common task that there already must exist dozens of solutions.
Probably overkill, but I remembered having come accross a parsing grammar for C comments in the POD of Damian Conway's Parse::RecDescent.

http://search.cpan.org/~tbone/Parse-RecDescent-FAQ-3.94/FAQ.pm#Removing_C_comments

[Francesco_13]

Thanks to all !