I want to get a list of all the files in the current directory that have two patterns. I can do first grep of one pattern and then with the output do the grep of the second pattern.
if the output of 1st pattern search results in many files, it is very difficult to do a grep of the 2nd pattern for... (1 Reply)
Hi,
Can we grep multiple patterns in UNIX.
for example:
cat /x/y/oratab | grep -i "pattern1|pattern2" .... etc
I require the syntax for multiple patterns. | is not working as I explained in example.
Malay (4 Replies)
Hi All,
I have a file. I need to find multiple patterns in a row and need those rows to divert to new file.
I tried using grep -e / -E / -F options as given in man.
But its not working.
==> cat testgrep.txt
william,fernandes,xxxxx
mark,morsov,yyyy
yy=,xx=
yyyy=,xxxx==
==>... (7 Replies)
Hi
I have 3 patterns for example to be searched.
These three patterns are available in file1.
The patterns to be searched are in file2.
I want to search the pattern of file1 to file2.
Can any one help with example?
Regards
Dhana (1 Reply)
I need a simple script to get all lines between 2 Patterns,
e.g.
.............
.............
114456723: testing Script
Alpha
Beta
114459234: testing Done
.............
.............
It should give all the lines in between 114456723 and 114459234, including these as well.
Any... (2 Replies)
I have a file with many rows.
I want to grep for multiple patterns from the file.
For eg:
XX=123|YY=222|ZZ=566
AA=123|EE=222|GG=566
FF=123|RR=222|GG=566
DD=123|RR=222|GG=566
I want the lines which has both XX and ZZ.
I know I can get it like this.
grep XX file | grep YY
But... (10 Replies)
Hi All,
I've been trying solve this with a simple command but not having much luck. I have a file like this:
Line 1: random_description 123/alert/high random_description2 356/alert/slow
Line 2: random_description3 654/alert/medium
Line 3: random_description4 234/alert/critical
I'm... (7 Replies)
I have a file with the following text:
grep \$
grep \\$
grep \\\$
grep '\$'
grep '\'$'
grep \\
grep \\\\
grep "\$"
grep '"$'
grep "$"
When I perform these same commands on this file, the result are never what I would expect them to be. Could someone please comment on the results and... (3 Replies)
I am trying to grep a variable with multiple lines with multiple patterns
below is the pattern list in a variable called "grouplst", each pattern is speerated by "|"
grouplst="example1|example2|example3|example4|example5|example6|example7"
I need to use the patterns above to grep a... (2 Replies)
Discussion started by: ajetangay
2 Replies
LEARN ABOUT DEBIAN
context::preserve
Context::Preserve(3pm) User Contributed Perl Documentation Context::Preserve(3pm)NAME
Context::Preserve - run code after a subroutine call, preserving the context the subroutine would have seen if it were the last statement
in the caller
SYNOPSIS
Have you ever written this?
my ($result, @result);
# run a sub in the correct context
if(!defined wantarray){
some::code();
}
elsif(wantarray){
@result = some::code();
}
else {
$result = some::code();
}
# do something after some::code
$_ += 42 for (@result, $result);
# finally return the correct value
if(!defined wantarray){
return;
}
elsif(wantarray){
return @result;
}
else {
return $result;
}
Now you can just write this instead:
use Context::Preserve;
return preserve_context { some::code() }
after => sub { $_ += 42 for @_ };
DESCRIPTION
Sometimes you need to call a function, get the results, act on the results, then return the result of the function. This is painful
because of contexts; the original function can behave different if it's called in void, scalar, or list context. You can ignore the
various cases and just pick one, but that's fragile. To do things right, you need to see which case you're being called in, and then call
the function in that context. This results in 3 code paths, which is a pain to type in (and maintain).
This module automates the process. You provide a coderef that is the "original function", and another coderef to run after the original
runs. You can modify the return value (aliased to @_) here, and do whatever else you need to do. "wantarray" is correct inside both
coderefs; in "after", though, the return value is ignored and the value "wantarray" returns is related to the context that the original
function was called in.
EXPORT
"preserve_context"
FUNCTIONS
preserve_context { original } [after|replace] => sub { after }
Invokes "original" in the same context as "preserve_context" was called in, save the results, runs "after" in the same context, then
returns the result of "original" (or "after" if "replace" is used).
If the second argument is "after", then you can modify @_ to affect the return value. "after"'s return value is ignored.
If the second argument is "replace", then modifying @_ doesn't do anything. The return value of "after" is returned from
"preserve_context" instead.
Run "preserve_context" like this:
sub whatever {
...
return preserve_context { orginal_function() }
after => sub { modify @_ };
}
or
sub whatever {
...
return preserve_context { orginal_function() }
replace => sub { return @new_return };
}
Note that there's no comma between the first block and the "after =>" part. This is how perl parses functions with the "(&@)" prototype.
The alternative is to say:
preserve_context(sub { original }, after => sub { after });
You can pick the one you like, but I think the first version is much prettier.
AUTHOR AND COPYRIGHT
Jonathan Rockway "<jrockway@cpan.org>"
Copyright (c) 2008 Infinity Interactive. You may redistribute this module under the same terms as Perl itself.
perl v5.10.0 2008-01-15 Context::Preserve(3pm)