Perl delete match loop
 

Greetings i'm running a command that captures a lot of lines to a variable.

$ELEMENT = `./my command`;
print $ELEMENT;

i need to delete lines that contain a certain string. At this point i think my output is one huge line. i tried saving itan array then iterate over the array a delete the match when it finds it but no luck. help please?
Thanks

Read the "Question Guidelines" link in my posting signature. We're happy to try to help you, but you need to provide details, and show your own efforts first. You don't post your program, give us examples of the input/output, or show us anything that you've done/tried to solve your problem.

There are MANY examples that can be found online for reading an array, and grep'ing for patterns within the array elements.

First hit for "loop through array elements in perl", in Google: https://www.perlmonks.org/?node_id=816177
First hit for "grep for string in perl": https://www.perlmonks.org/?node_id=1003945

ok my first step is running the command to capture the output to a scalar.

@COMMAND_OUTPUT = `./command`;
this command consists of about 130 lines. Ideally i would like to ignore a subset of lines containing 'x'

foreach $var (@COMMAND_OUTPUT){
if ($var =~ m/pattern/) {
then ignore that string\n;
}

i think my initial capture is wrong because i expect 130 elements in that array but there are only 5 when i assign it to a scalar and print. I'm novice here. Thanks,
$NUM=@COMMAND_OUTPUT;
print "$NUM\n"; # this says 5 elements

What I do when doing line-by-line processing:
That is, read each line, act on it according to the content of the line.
The script I borrowed from just reads every input line and writes it into an email for a spam report.
Some lines are used to populate a log file...

I usually don't load an array when reading from a command:
...but your load of the array looks right to me. Not sure about your counting step tho...no, that looks right too. So you need to look at the output of your command again, I think.

Afterthought: Are you counting the array before or after you try to delete elements from it...and what are you doing to "delete" from the array?

for the loop section i have the following. Should this work if i want to just print everything other than whats in the EXCLUDE array ?

@EXCLUDE="successfully", "execution";

foreach $var (@ELEMENT){
if ($var !=~ m/@EXCLUDE/) {
print $var;
}
}

Does it? Did you try it?
Probably not. I'm pretty sure your syntax is not correct at You need to read up on perl regular expressions and pattern matching. See my #4. signature link.

Could be written as:

I think there is a pre-written program for that, named egrep:

how I do it: